巻号一覧
33 巻, 12 号
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原 昭夫, 三宅 雅也1969 年 33 巻 12 号 p. 1323-1328
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to make clear the formation process of tungsten carbide powder for cemented carbide, the coarse tungsten powder was carburized at temperatures between 1000°C and 1900°C for 20 minutes in hydrogen atmosphere and its cross-section was observed by an optical microscope. The surface of the carburized powder was observed by an electron microscope. And the relation in the micro-structure between the carburized powder and the cemented carbide was studied.
The results are summarized as follows:
(1) If the tungsten powder consists of the secondary particle (polycrystalline particle), carbon diffused inward from the periphery of the secondary particle.
(2) In the di-tungsten carbide and the tungsten carbide phase which were formed, grain boundaries were observed. The crystal grain in each phase grew up with an incrase of the carburization temperature.
(3) In the coarse W powder used in the present study, the formed tungsten carbide particle is polycrystalline, when the combined carbon reaches the theoretical value.
(4) After the combined carbon reaches the theoretical value, the grain growth of tungsten carbide is subjected to the grain boundary movement in the particle.
(5) If the WC powder is made from the coarse W powder as the raw material for cemented carbide, it is often polycrystalline. In case the polycrystalline WC powder is used, the WC grain size in the cemented carbide is primarily determined by the single crystal size in the polycrystalline particle.抄録全体を表示PDF形式でダウンロード (2028K) -
矢島 正美, 石井 満, 小林 勝1969 年 33 巻 12 号 p. 1328-1333
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe pressure-induced brittle ductile transition in polycrystalline zinc was examined, with special reference to the variation of transition pressure with the grain size of specimens. Fracture stress σfr in the brittle pressure range increases linearly with pressure P applied and is expressed as
(This article is not displayable. Please see full text pdf.)
where a constant η is nearly 0.35 and σfr(0) is the fracture stress at ambient pressure.
The pressure-induced transition has been found to occur when the fracture stress reaches the necking stress σn. The variation of transition pressure Pc with grain size comes from the dependence of σfr(0) on grain diameter d of specimens, i.e. σfr(0)=Kfrd−1⁄2, where Kfr is a constant, and the following relation is established:
(This article is not displayable. Please see full text pdf.)
Generally speaking, Pc does not vary linearly with d−1⁄2, since the necking stress σn also depends on grain size. However, within a narrow grain size range in which the variation of σn is rather small, Pc satisfies the relation Pc∝d−1⁄2.
Finally, the rapid or discontineous increase of ductility of zinc at the transition pressure has been explained on the basis of the previously proposed criterion of ductile fracture, viz. “the constancy of hydrostatic tensile stress”.抄録全体を表示PDF形式でダウンロード (1570K) -
長谷川 正, 佐藤 洋, 辛島 誠一1969 年 33 巻 12 号 p. 1333-1337
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーA series of experiments has been carried out to make clear the substructure formed during high-temperature creep deformation of copper single crystals using the Berg-Barrett method, the etch-pit technique and transmission electron microscopy. In this paper, the dislocation motion and the creep rate in the steady-state creep region are discussed on the basis of the results of these experiments.
The main conclusions obtained are as follows: (1) The creep rate in the steady-state region is mainly related to the dislocation motion within the subgrains surrounded by “large angle sub-boundaries” which can be detected by the Berg-Barrett method and by the etch-pit technique, but it is nearly independent of these “large angle sub-boundaries”. (2) Most of the mobile dislocations are emitted from “small angle sub-boundaries” which exist within the subgrains surrounded by the “large angle sub-boundaries” and are observed only by transmission electron microscopy. After gliding within subgrains surrounded by the “small angle sub-boundaries”, the mobile dislocations are absorbed into the sub-boundaries to become immobile. The mean free path of the mobile dislocations is thus limited by the “small angle sub-boundaries”. (3) Steady-state creep rates can be explained almost quantitatively from the results by transmission electron microscopy, on the assumption that the glide motion of screw dislocations with super jogs is the rate-determining process. It has been concluded that the super jogs have heights of ∼6 b and ∼20 b and spacings of ∼0.2 μ and ∼0.4 μ at 610°C and 745°C, respectively.抄録全体を表示PDF形式でダウンロード (948K) -
長谷川 正, 石井 良知, 辛島 誠一1969 年 33 巻 12 号 p. 1337-1343
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーCopper single crystals grown in vacuum (10−4∼10−5 mm Hg) by the Bridgman method were annealed in vacuum (∼2×10−5 mm Hg) under three conditions; (1) isothermal annealing, (2) thermal cyclic annealing by a moving furnace, and (3) thermal cyclic annealing by a fixed furnace. Changes in the dislocation distribution, dislocation density and length of sub-boundaries with annealing were examined by means of the etch-pit technique.
The dislocation density and the length of sub-boundaries were decreased more significantly by thermal cyclic annealing than by isothermal annealing. The effects of thermal cyclic annealing by a moving furnace were of the same order as those of thermal cyclic annealing by a fixed furnace. In a specimen with small subgrains, the effects of annealing were smaller than in a specimen with large subgrains.
In copper single crystals with subgrains larger than a few milimeters, the dislocation densities of the order of 105/cm2 could be decreased to ∼103/cm2 by thermal cyclic annealing for more than 100 hr with a period of 15∼30 min.抄録全体を表示PDF形式でダウンロード (2090K) -
武井 英雄, 中佐 啓治郎, 吉永 芳豊1969 年 33 巻 12 号 p. 1343-1349
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe notch tensile strength and the fracture toughness of 30% and 60% ausformed 9%W-2.5%Cr steels (SKD 5) and the conventionally heat treated one were examined, in order to study the effects of ausforming and subsequent tempering on the characteristics of brittle fracture caused by sharp notches or small cracks. The results obtained are as follows:
(1) The ultimate tensile strength and the yield strength of the 60% and 30% ausformed steels and the conventionally heat treated steel become smaller in that order up to the tempering temperature of 700°C, and though the ultimate tensile strength is not so changed with tempering temperature up to 500°C, the yield strength is largest at the tempering temperature of 300°C.
(2) The notch tensile strength of the 60% and 30% ausformed steels and the conventionally heat treated steel become larger in that order up to the tempering temperature of 400°C. But at the tempering temperature of 600°C, the notch tensile strength of the 60% ausformed steel is much larger than that of the 30% ausformed or the conventionally heat treated steel, because the former increases slightly at that tempering temperature while the latters decrease remerkably.
(3) The fracture toughness Kc versus tempering temperature relationship is very similar to the notch tensile strength versus tempering temperature relationship.
(4) The pop-in fracture toughness KIC of the 60% and 30% ausformed steels and the conventionally heat treated steel become larger in that order, but it is not so influenced by tempering as the fracture toughness Kc.
(5) The strong interrelation is found between the fracture toughness Kc and the notch tensile strength regardless of the ausform reduction and the tempering temperature.抄録全体を表示PDF形式でダウンロード (1881K) -
武井 英雄, 中佐 啓治郎, 山崎 敦通1969 年 33 巻 12 号 p. 1350-1354
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe delayed fracture strength and the corronsion fatigue strength of the ausformed 9%W-2.5%Cr steel (SKD 5) and the conventionally heat treated one were examined, in order to investigate the effects of ausforming and subsequent tempering on these two environmentally induced fracture. The results obtained are as follows:
(1) The delayed fracture of the 60% ausformed steel is observed in water and 3%NaCl solution, but not in air till 200 hr.
(2) The delayed fracture strength of the 30% and 60% ausformed steels are smaller than that of the conventionally heat treated one for a relatively short fracture time, but the 200-hr delayed fracture strength of each steel is nearly equal.
(3) The effect of tempering temperature on the delayed fracture characteristics is very complex, but in general, tempering seems to improve the delayed fracture strength.
(4) There is a certain relationship between the slow crack length at delayed unstable fracture and the applied stress, regardless of the variety of environments and tempering temperature.
(5) The current fracture mechanics can be applied to the delayed fracture.
(6) The fatigue strength of the as-ausformed and as-quenched steels are nearly equal in air. But by tempering at 500° or 625°C, the former increases, while the latter decreases, and the endurance limit of the latter decreases remarkably by tempering at 625°C.
(7) In the corrosive environment of 3%NaCl solution, the fatigue strength of the 60% ausformed and conventionally heat treated steels are nearly equal, so that ausforming has no effect on improving their corrosion fatigue strength.
(8) The corrosion fatigue strength of the 60% ausformed steel is not improved by tempering at 500°C.抄録全体を表示PDF形式でダウンロード (1620K) -
丹治 雍典, 白川 勇記, 森谷 博1969 年 33 巻 12 号 p. 1354-1358
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe internal friction Q−1 of nickel annealed at 1000°C for 10 hr was measured in a magnetic field with an electrostatic driving method. The results obtained are as follows: (1) With decreasing magnetic field H from a magnetically saturated state, Q−1 incareases from about H=30 Oe and shows a maximum at H=15 Oe. (2) The magnetic hysteresis loss Qh−1 was separated from the whole Q−1 by measuring the dynamic stress with an interference comparameter. (3) When Qh−1 is expressed as a function of magnetization I⁄IS, Qh−1 shows a maximum at I⁄IS=0.6; it becomes smaller with increasing driving frequency f and vanishes at f=5.8 kHz.抄録全体を表示PDF形式でダウンロード (1200K) -
今井 勇之進, 村田 威雄1969 年 33 巻 12 号 p. 1359-1364
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe tensile load was automatically controlled so as to satisfy the loading condition for constant stress creep tests, W=W0l0⁄l, where W is the tensile force, l is the gauge length of specimen and suffix 0 stands for initial values. The elongation of specimen was measured by means of differential transformers. The output signal (equivalent to l) was fed into a servo-divider and a signal (equivalent to W) being proportional to reciprocal l was calculated. There were two holes at the bottom of a water vessel to increase or decrease the volume of water whose weight was applied to the specimen. Automatic control of the dead load was performed by free drainage and the supply of water controlled by a pneumatic valve in accordance with the calculated value of W. The tensile force acting on the specimen being directly measured by means of a load cell connected in series with the specimen and an automatic balancing indicator, could be controlled accurately against various disturbances. Maximum tensile force being 100 kg, a deviation of the force from the calculated value during constant stress creep tests could be kept within 1%. This creep tester can be applied for vacuum creep tests (>3×10−6 Torr) and also for tensile tests and stress relaxation tests at elevated temperatures (<900°C). A new precise temperature controller has been developed for stress relaxation tests.抄録全体を表示PDF形式でダウンロード (1885K) -
増本 健, 今井 勇之進1969 年 33 巻 12 号 p. 1364-1371
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーStructural diagrams and tensile properties of the 18%Cr-Fe-Ni-N system alloys were examined in the range of compositions from 0 to 20% nickel and up to 0.4% nitrogen. The results are summarized as follows: (1) The phase reaction in this system was considered from the isothermal structural diagrams at various temperatures between 1300° and 500°C. The austenite-promoting effect of nitrogen is about 25 times that of nickel. Also the solubility of nitrogen in austenite decreases in the proportion of about 4×10−3%N/%Ni with increasing nickel content. (2) The vertical section diagrams were obtained for 2, 5, and 8% nickel contents and for 0.1 and 0.2% nitrogen contents. The solubility of nitrogen in austenite of 18%Cr-8%Ni-Fe alloy may be expressed by the equation, log(%N)=−1080⁄T+0.284. (3) The quench-hardening introduces in vicinity of γ⁄α+γ boundary, especially the maximum value in the composition range of about 2% nickel and 0.3∼0.4% nitrogen. The metastable austenitic alloys as the 18%Cr-8%Ni-Fe system possess the characteristic tensile property that both the strength and ductility increase due to the martensite formation during deformation. In the stable austenitic alloys containing about 10% nickel or more, both the tensile and yield strengths increase at a ratio of about 7 kg/mm2 per 0.1% nitrogen.抄録全体を表示PDF形式でダウンロード (2574K) -
佐藤 公隆, 須藤 友義, 黒沢 文夫, 神森 大彦1969 年 33 巻 12 号 p. 1371-1376
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe relationship was investigated between crystallization and infrared spectra of α- and γ-ferric oxyhydroxides (α-FeOOH, γ-FeOOH), which play an important role as the main components of iron ores and rusts. The results obtained are as follows:
(1) The absorbance of the 1100 cm−1 band of α-FeOOH increases with the increases of the degree of incompleteness of its crystallization.
(2) The 600 cm−1 band of α-FeOOH shifts from 610 to 643 cm−1 (The more the crystallization is, the higher the wave number shift goes). Accordingly, this absorption band should be called “the crystalline band”.
(3) The three bands of α-FeOOH near 400 cm−1 (450, 400 and 372 cm−1) and of γ-FeOOH near 500 cm−1 (590, 520 and 483 cm−1) split considerably according to the progress of crystallization.
(4) The absorbances of the characteristic bands of α- and γ-FeOOH are related to the half widths of those X-ray diffraction patterns.
(5) The characteristic curves between the absorbance and quantity for the sample treated for different ageing periods are apparently different, because of its crystallization.抄録全体を表示PDF形式でダウンロード (1842K) -
田村 今男, 牧 正志, 波戸 浩1969 年 33 巻 12 号 p. 1376-1382
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe morphology of martensite induced during tensile deformation at various temperatures in Fe-29%Ni-0.26%C (Ms=−35°C, Md≈+5°C) and Fe-31%Ni (Ms=−57°C, Md≈−15°C) alloys was observed by means of optical and transmission electron microscopy. The results obtained are as follows:
(1) The small martensites having a characteristic morphology are induced by tensile deformation. The morphology of these martensites is entirely different from that of the thermally transformed martensite. These small martensites are formed mainly at the temperatures between Ms and Md.
(2) The martensite thermally transformed from the austenite of these alloys is plate-like partially twinned one with the mid-rib, the so-called “Umklapp” martensite. On the other hand, the strain-induced martensite is an untwinned martensite, and the orientation relationship between austenite and martensite is nearly K-S type. It is, therefore, considered that the strain-induced martensite belongs to the “Schiebung” martensite. This suggests that there is an essential difference in the transformation mechanism between the two martensites.
(3) The plate-like martensites are also induced by deformation just above or below the Ms temperature. These martensites are produced in the early stage of deformation.抄録全体を表示PDF形式でダウンロード (3255K) -
田村 今男, 牧 正志, 波戸 浩, 油井 孝輔1969 年 33 巻 12 号 p. 1383-1389
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIt has been reported that a large amount of plastic strain is produced by strain-induced martensitic transformation during deformation in metastable austenitic stainless steel (Fe-Cr-Ni alloys). However, few fundamental studies have been carried out for such a phenomenon called transformation-induced plasticity, especially in Fe-Ni alloys. In the present study, the tensile test was carried out at various temperatures using Fe-29%Ni-0.26%C (Ms=−35°C), Fe-31%Ni (Ms=−57°C) and Fe-15%Cr-13%Ni (Ms=−58°C) alloys, and the variation in tensile properties, especially elongation, with test temperature was investigated. The results obtained are as follows :
(1) Transformation-induced plasticity occurs in Fe-Ni alloys as well as in Fe-Cr-Ni alloy.
(2) Elongation has a maximum value at temperatures between Md and Ms in both Fe-Ni alloys and Fe-Cr-Ni alloy. As a condition necessary to obtain the maximum elongation, it is essential that the strain-hardening exponent should increase continuously with increase in strain. The martensites gradually induced with strain are available for elongation. On the other hand, when the martensites are formed in large quantities in the early stage of deformation near the Ms temperature the elongation is not so large.
(3) It is considered that the main causes of the large elongation (abnormal plasticity) is the suppression of necking and of the initiation and propagation of microcracks by the formation of strain-induced martensites which contribute to the relaxation of stress concentration.
(4) The temperature range for the large elongation in Fe-Cr-Ni alloy is wider than that in Fe-Ni alloys.抄録全体を表示PDF形式でダウンロード (2601K) -
川口 寅之輔, 小川 紘一, 明石 宗久1969 年 33 巻 12 号 p. 1390-1395
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIron-copper alloys subjected to severe cold working come to have good magnetic properties as semi-hard magnet materials. The specimens containing 30∼70%Fe and the balance Cu were reduced 55.6∼98.6% by cold drawing and then tempered at temperatures from 100° to 1000°C. The results obtained are as follows : the cross section of the iron phase in the copper matrix is about 0.1×1.0 μ, when the alloys are severely cold-drawn up to the reduction of 98.6%. With increasing degree of cold-drawing, the residual induction (Br), the squareness (Br⁄B400), and especially the coercive force, become larger. The saturation induction is increased in propotion to iron content. But the coercive force is inversely decreased with increase in iron content and eventualy comes to obey the equation of Hc=Hc(0) (I−P). When the specimens are tempered at 380°∼400°C after a considerable reduction, their coercive forces are suddenly increased, showing a maximum value of 240 Oe for the specimen cold-reduced 98.6%.抄録全体を表示PDF形式でダウンロード (2109K) -
後藤 秀弘, 前田 富士雄1969 年 33 巻 12 号 p. 1396-1399
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーA simple, rapid and accurate method is proposed for the determination of iron, cobalt, nickel and copper in alnico alloys.
Samples are dissolved in nitric and hydrofluoric acid, and diluted with saturated boric acid solution to mask the excess of hydrofluoric acid. The X-ray intensities of FeKα, CoKα, NiKα and CuKα were measured with an identical sample, and substituted into Ii in simultaneous equation (Ii=ΣαijCj). The concentrations of these element in the sample can be obtained by solving the equation by use of a computer. Application of this method resulted in the success of the rapid analysis of the sample within 15 minutes.
The reproducibility were 0.85, 0.36, 0.32 and 1.3% for iron, cobalt, nickel and copper, respectively.抄録全体を表示PDF形式でダウンロード (1202K) -
新井 甲一1969 年 33 巻 12 号 p. 1400-1405
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe aqueous oxidation of zinc sulfide in dilute HCl solution at acidic media are studied by means of an electrochemical method. Electrolytes used are dilute HCl solutions contained NaCl with pH values 1∼3 and deaerated with nitrogen gas. The test electrodes are form a mixture of electric conductive paint and metallic sulfide.
Both anodic and cathodic polarization behaviors are measured by means of a potentiodynamic polarization method.
The experimental results obtained are as follows.
(1) The S0 producing type reaction of ZnS dissolution is accelerated in proportion to increasing temperature, at low pH values and within a suitable range of potential. The overall reaction is as follows.
(This article is not displayable. Please see full text pdf.)
The half-cell reaction are:
(This article is not displayable. Please see full text pdf.)
and
(This article is not displayable. Please see full text pdf.)
(2) The S0 producing type reaction of ZnS dissolution is accelerated by the activation treatment of ZnS. Its reaction increases proportionally with increasing concentration of CuS in place of the ZnS surface layers. The S0 produced by the anodic oxidation of ZnS is amorphous sulupher.
(3) The acceleration of the S0 producing type reaction in the dissolution of activating ZnS is caused by the formation of a galvanic cuople of the ZnS-CuS system. In this case, ZnS is anodic and CuS exists as the cathode to the reduction of aqueous oxygen in the solution.抄録全体を表示PDF形式でダウンロード (1710K) -
西 義, 安保 武志, 古谷 嵩司1969 年 33 巻 12 号 p. 1405-1410
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーEffects of S and C additions on the columnar crystallization of high-coercivity Alnico alloys containing more than 5%Ti have been studied, using the heating mold kept at temperatures above the melting points of the alloys. The results obtained are as follows: (1) Columnar crystals 120-160 mm long are easily obtained by a duplex addition of S and C to the alloys containing 5-7%Ti. As for Ticonal 2000-type alloys containing 8%Ti and 39%Co, however, only the dendritic structures are obtained. (2) In a casting having the columnar structure, segregations of Ni, Cu and Co can hardly be observed, and segregations of Al and Ti are so scarce that their effects on the magnetic properties can be neglected. (3) Using this method, alloys with magnetic properties, Br of about 11000 G, Hc of about 1500 Oe and (BH)max of above 10 MGOe, are produced. The highest values of Br and (BH)max are obtained between 20 and 100 mm from the chill. (4) The length of inclusions, Ti-sulfides and carbides found in the alloys, increases lineally with the distance from the chill.抄録全体を表示PDF形式でダウンロード (1818K) -
増本 量, 沢谷 昭八1969 年 33 巻 12 号 p. 1410-1413
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn previous work the present authors investigated the temperature coefficient of Young’s modulus of Pd-Au alloys, and obtained a positive temperature coefficient of +2.8×10−5 for the alloy containing 50% gold, “Pallagold”, which was heated at 360°C for 15 hr after water quenching or cold working. A series of experiments has been carried out so as to investigate the effects of additions of small amounts of Pt, Ir, In, Ta, Ag, Fe, Ni, Co, Mn, Cu, V, Mo, W, Sb, Sn, Zn, Cr, Al, Ti, Si, Cd, Be, Zr, B and Nb on the Young’s modulus and its temperature coefficient and hardness of Pd-Au alloys containing 45, 50 and 55% gold. The resuts show that in general the Young’s modulus and hardness of the binary alloys are larger than those of the ternary alloys, and the temperature coefficient of Young’s modulus in negative sign is increased by the addition on the third elements.抄録全体を表示PDF形式でダウンロード (1162K) -
増本 量, 沢谷 昭八1969 年 33 巻 12 号 p. 1414-1417
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーMeasurements of the linear coefficient of thermal expansion, Young’s modulus and its mean temperature coefficient, and density were carried out at elevated temperatures so as to investigate the variation in the Elinvar property of nickel at high temperature with the addition of palladium and platinum. It has been made clear from the results of these measurements that in the Ni-Pd and Ni-Pt systems investigated the temperature at which the Elinvar property of nickel appears falls down along the magnetic transformation point with increasing additive elements, and also a minimum linear coefficient of thermal expansion which represents the Invar property is observed near a composition in which the Elinvar property occurs.抄録全体を表示PDF形式でダウンロード (423K) -
須藤 一, 宇野 照生, 中村 義一1969 年 33 巻 12 号 p. 1417-1423
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーA great deal of work has been made on the high-temperature creep of dispersion-strengthening alloys, and some precipitation strengthening alloys show that the activation energy of creep is very large as compared with the activation energy of self-diffusion in the matrix metal. In order to understand the mechanism controlling the high temperature creep of dispersion-strengthening alloys and usual precipitation-strengthening alloys, the high temperature internal friction and creep of internally oxidized copper-aluminum alloys were investigated. The results obtained are as follows : The dislocations joining hard particles remain very stable even after high-temperature annealing. The activation energies of steady state creep and of the relaxation process of the damping peak at about 750°C were 84 kcal/mol and 70 kcal/mol, respectively. It has been predicted that these activation processes are both in a non-conservative motion of pin-downed dislocation bound directly on the hard particle surface.抄録全体を表示PDF形式でダウンロード (1890K) -
三沢 俊平, 山本 尚夫, 末高 洽, 下平 三郎1969 年 33 巻 12 号 p. 1424-1431
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe effect of oxidation rate and addition of Cu2+ or PO43− ion on the oxidation of Fe(II) hydroxo-complexes in aqueous solutions were investigated by means of measurements of the infrared and Mössbauer’s spectra and the X-ray diffraction of oxidation products.
The results obtained are summarized as follows:
(1) The rapid oxidation of Fe(II) hydroxo-complexes in solutions with the addition of H2O2 resulted in the formation of δ-FeOOH. The oxyhydroxide was obtained also by removing water from the Fe(II) complexes and leaving them in air to be oxidized.
(2) The size of δ-FeOOH crystallite formed by the oxidation of Fe(OH)2 with H2O2 is determined by the size of particle of the starting compound. The broad absorption band at 450 cm−1 shifted to 480 cm−1 with the increase in crystallite size. The shift of the absorption band probably corresponds to the increase in force constant of vibration, which may result from the increase of crystallite size, i.e. the decrease in interatomic distance.
(3) Green Rust I was converted to Fe3O4 by the slow oxidation in solution.
(4) In the presence of Cu2+ or PO43− ion, freshly precipitated Fe(II) hydroxo-complexes were oxidized to amorphous δ-FeOOH with air in solutions. This transformation is considered to be caused by the catalytic effect of Cu2+ or PO43− ion in the oxidation of the Fe(II) complexes.抄録全体を表示PDF形式でダウンロード (2668K) -
1969 年 33 巻 12 号 p. 1431a
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーPDFを参照． （誤）硫酸 (1+1) 2 mL, (Reference: Blank) （正）硫酸 (1+10) 2 mL, (Reference: Mixed organic solvent)抄録全体を表示PDF形式でダウンロード (24K) -
1969 年 33 巻 12 号 p. 1431b
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリー
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