巻号一覧
40 巻, 11 号
選択された号の論文の24件中1～24を表示しています
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一ノ瀬 昇1993 年 40 巻 11 号 p. 1036
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーPDF形式でダウンロード (66K) -
小川 稔, 武田 保雄, 今西 誠之, 山本 治1993 年 40 巻 11 号 p. 1037-1040
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe solid solution region of infinite-layered copper oxide Ca1-xSrxCuO2 was studied under various oxygen partial pressure.The stability region expanded with decreasing oxygen pressure. The trials for electron or hole doping were tried, the intercalation of Li ion by the discharge in Li-battery was possible forming (Ca0.85Sr0.15)0.9LixCuO2(x ?? 0.2). Both a and c axes increased with increasing x, indicating the reduction of oxidation state of Cu, but it did not bring about superconductivity.抄録全体を表示PDF形式でダウンロード (224K) -
入沢 明典, 吉川 信一, 金丸 文一1993 年 40 巻 11 号 p. 1041-1044
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーHeat treatment effects were investigated on T'-type 214 compounds Ln1.85Ce0.15CuOy with Ln=Pr, Nd, Sm or Eu. Annealing in sealed tube did not much affect on their electrical behavior of superconducting Nd1.85Ce0.15CuOy. Electrical resistivitiy was reduced in the case of Ln=Sm and Eu but was enhanced on Ln=Pr with the annealing. Unit cell volume expanded with a decrease of oxygen content on Ln=Nd but shrank on Ln=Pr. These results could be understand as follows:trivalent neodymium ion has suitable ionic size in T'type structure, samarium and europium ions are too small so that oxide ion defect is easily introduced in the fluorite layer to expand its size to fit with the CuO2 conduction plane, and praseodymium is too large so that CuO2 conduction plane partially release its oxide ion. Surface of superconducting Nd1.85Ce0.15CuOy was oxidized within 50days to the condition before the reduction to make the sample superconducing even if the sample was kept in a vacuum desiccator.抄録全体を表示PDF形式でダウンロード (188K) -
向井 保雄, 武田 保雄, 今西 誠之, 山本 治1993 年 40 巻 11 号 p. 1045-1048
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーSuperconductivity in La2-xCdxCuO4+z(0≤x≤0.1) and La2-xPbxCuO4+z(0≤x≤0.15) were studied. The solid solutions prepared under ambient pressure and high oxygen pressure showed only semiconducting property, although they have enough formal valence of copper such as +2.1-2.15. Strong oxidation by electrochemical treatment only brought about superconductivity at Tc=20-40K for La2-xCdxCuO4+z and 15-20K for La2-xPbxCuO4+z抄録全体を表示PDF形式でダウンロード (204K) -
草野 圭弘, 難波 徳郎, 高田 潤, 池田 靖訓, 高野 幹夫, 武田 保雄1993 年 40 巻 11 号 p. 1049-1052
発行日: 1993/11/15
公開日: 2009/12/04
ジャーナル フリーPhases and their relations in the BiO1.5-SrO(SrCO3)-CuO system have been studied mainly by XRD. The crystal structure of the newly found phase has been examined by XRD, TEM and ED. Phase equilibrium was established at 720°C in air. Monophasic products of the newly found phase were obtained at 720°C for a composition of Bi:Sr:Cu=0.25:0.55:0.20. The newly found phase has a tetragonal structure with lattice parameters of a=5.513Å and c=39.93Å.抄録全体を表示PDF形式でダウンロード (1735K) -
酸素分圧の影響小林 斉也, 福原 実, 土井 章, 高田 利夫, 草野 圭弘, 高田 潤, 池田 靖訓, 高野 幹夫1993 年 40 巻 11 号 p. 1053-1056
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe effects of O2-partial pressure on formation of the Bi-2223 phase. The samples were heated at 807°C-850°C under various O2 atmospheres after calination in air or Ar flow. Single phase products of the 2223 phase were obtained by heating in 20%O2 both in Ar and air. The Pb-substituted 2212 phase, (Ca, Sr)2Cu03 and CuO coexist in samples calcined i n Ar. The 2223 phase forms at a markedly lower temperature (807°C) in samples calcined in Ar than in those in air. In samples calcined in Ar, the 2223 phase forms without formation of (Ca, Sr)2PbO4. These results reveal that the formation process of the 2223 phase in samples calcined in Ar is different from that i n thoseinair.抄録全体を表示PDF形式でダウンロード (2228K) -
草野 圭弘, 難波 徳郎, 高田 潤, 池田 靖訓, 高野 幹夫, 江木 俊雄1993 年 40 巻 11 号 p. 1057-1060
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーChemical stability of the Bi-2223 phase has been studied for the samples Bi0.9Pb0.2SrCaCu1.6O2 Annealing of the bulk samples below 800°C leads to precipitation of the 3321 phase identified as Sr2.5Bi0.5Pb3Ca2CuOz. The precipitation of the 3321 phase from the 2223 phase decreases the volume fraction of the 2223 phase but Tc (x) remains unchanged. It was found by XRD and SQUID measurements and SEM observation that, through reheating at 850°C after heating at 750°C, the 3321 phase disappeares and the volume fraction of the 2223 phase perfectly recovers.抄録全体を表示PDF形式でダウンロード (1409K) -
西坂 強, 羽根 晶, 加藤 和彦, 小高 博文, 星野 和友1993 年 40 巻 11 号 p. 1061-1064
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe effect of the cooling process on superconductivity has been studied for the samples with nominal compositions of Bi1.6Pb0.5Sr2.0Ca2.0Cu3.0Oz sintered at 1123K for 80h in air. The results are summarized as follows:
(1) Samples which have the cooling rates of the range from 1 to 100K/minn have shown good superconductivity, the critical temperature > 100K and the critical current density > 80A/cm2.
(2) From TG measurements, the two oxidation peaks in cooling process have been observed, where these high and low temperature peaks seem to be related to the reactions of 2223 and 2212 phases, respectively.
(3) The critical current density has increased from 80 to 165A/cm2 by the cooling process with holding at 1093K for a few hours.抄録全体を表示PDF形式でダウンロード (2383K) -
各種置換体の比較新苗 稔展, 高田 潤, 池田 靖訓, 坂東 尚周1993 年 40 巻 11 号 p. 1065-1068
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーMechanical grinding and the reformation from ground powder of the "2201" phase doped Pb, Ca and Ba were examined by XRD and DTA. The "2201" solid solutions changes easily into fine powder by mechanical grinding. The Ca-or Ba-substitution for Sr tends to suppress the formation of SrCO3 from the ground powder on mechanical grinding in air. The formation of Bi2CuO4 at 400°C and the reformation of the original "2201" phase at 800°C seem to be common for the "2201" solid solutions. The ground powder consists of not amorphous powder but ultra-fine crystals. Each crystal has a diameter of 30 to 100 Å and a thickness of one unit cell or a half unit cell length and thermally unstable.抄録全体を表示PDF形式でダウンロード (260K) -
田中 浩直, 高桑 光一, 那須 昭一, 大橋 憲太郎1993 年 40 巻 11 号 p. 1069-1072
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe effects of water, ethyl alcohol or acetone on the Jc(77K) value of superconductors in the Bi(Pb)-Sr-Ca-Cu-O system were investigated. Starting powders for sintering were prepared by calcining the mixture of the composition (a)Bi1.8Pb0.4 Sr2Ca2Cu3.2Oy or (b)Bi1.98Pb0.22Sr2Ca2Cu3Oy. The 1st sintered compacts of the former composition (a) were heat-treated by 4 steps and press-formed at 196MPa.
The Jc value of the samples soaked for 288h in water was lower by 25A/cm2 than that of the sample without soaking (Jc=40A/cm2). Those of the samples soaked in ethanol and acetone were constant. The higher value of Tc and Jc was obtained for the samples made by more steps of repress-forming and sintering. The values of Tc and Jc of 1st sintered samples without heat-treatment decreased more rapidly with soaking time affected by water and the organic solvents.抄録全体を表示PDF形式でダウンロード (2834K) -
江木 俊雄, 長谷 隆司, 渋谷 和幸, 林 征治, 小川 陸郎, 川手 剛雄1993 年 40 巻 11 号 p. 1073-1076
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe influence of the Ag-doping, the composition, and the structure in the critical current density (Jc) of Ag-sheathed tapes of Bi2212 superconductors were studied for samples with nominal compositions of Bi2.0+xSr2.0Ca1.0Cu1.9AgyOz (x=0 to 0.2, y=0, 0.1). Jc of Ag-sheathed tapes were enhanced by Ag-doping and optimization of Bi content. The maximum value of the Jc was 90, 200 A/cm2 at 4.2K in OT for x=0.1 and y=0.1.Increment of Jc was due to the highly textured 2212 phase and the decrease of the quantity of impurity phases.抄録全体を表示PDF形式でダウンロード (2347K) -
石井 守, 塚本 惠三, 下嶋 浩正, 山岸 千丈, 高田 雅介, 山下 努1993 年 40 巻 11 号 p. 1077-1080
発行日: 1993/11/15
公開日: 2009/12/04
ジャーナル フリーWhen a Bi(Pb)-Sr-Ca-Cu-O cylindrical specimen was subject to a magnetic field applied parallel to the cylindrical axis, the flux profiles inside specimen were calculated based on the critical state model. These calculations agreed with the experimental results.抄録全体を表示PDF形式でダウンロード (217K) -
勝山 茂, 原田 佳尚, 真島 一彦, 永井 宏1993 年 40 巻 11 号 p. 1081-1084
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe effect of mechanical grinding (MG) on the physical properties of YBa2Cu3Oy-Ag composite superconductor was examined. The critical current density (Jc) and the global pinning force (F ?? ) increase by the Ag addition. The Jc of the samples without MG treatment shows the maximum value at about Ag 8 wt%. On the other hand, that of the samples with MG treatment is constant independent of Ag content. The F ?? of the samples increases by the Ag addition, and the F ?? of the samples with MG treatment is larger than that of the samples without MG treatment. There may be difference of the distribution of Ag between in the samples without and with MG treatment.抄録全体を表示PDF形式でダウンロード (231K) -
鈴木 敏正, 山田 貴司, 根岸 弘, 牧野 達也, 中澤 昇, 本田 慎一, 廣瀬 治男1993 年 40 巻 11 号 p. 1085-1088
発行日: 1993/11/15
公開日: 2010/07/12
ジャーナル フリーYBa2Cu3Ox (YBCO) thin films have been grown on (100) MgO substrate by off-axis magnetoron sputtering. Critical temperature(Tc) of YBCO films strongly depended on substrate temperature, sputtering gas composition and total pressure and “in-situ” annealing conditions. When substrate temperature was 700°C, and gas composition and total pressure were Ar+50%O2 and 200mTorr respectively, YBCO films of Tc=77.5K was obtained. XRD pattern of this film showed sharp (00l) peaks showing very high c-plane orientation. Scanning tunneling microscopic (STM) image of the films showed growth spirals which were aligned to one direction. The size of the growth spirals were 150-300nm. On the other hand, when substrate temperature was 650°C, Tc was 25K and its XRD pattern showed both (h00) peaks and (00l) peaks. STM image of this film showed both textured structures and growth spirals. We presumed that c-plane crystal shows growth spiral and a-plane one shows textured structure in sputter grown YBCO films. Patterning of YBCO thin films by photolithography did not cause the reduction of Tc.抄録全体を表示PDF形式でダウンロード (1307K) -
貞広 嘉和, 本田 宏隆, 小石 真純1993 年 40 巻 11 号 p. 1089-1091
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe ingredient was treated by a hybridization apparatus for fixed time and these products were calcined at 925°C for 2 days, and annealed at 500°C for 7 days. The treatment effects on the samples were inferred from the analysis of the X-ray peaks and SEM observation. It has been clarified that the ingredient materials were very well mixed by treating for 10 minutes, so that the calcined sample was very good superconductor.抄録全体を表示PDF形式でダウンロード (2147K) -
杉原 淳, 福島 都人1993 年 40 巻 11 号 p. 1092-1095
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーJoinings of semiconductive BaTiO3 with Y1Ba2Cu3O7-x were studied by hot press and by sintering in the case of thick film (about 18-30μm) of Y1Ba2Cu3O7-x. The conditions of hot press were 4 kg/cm2 and kept for 420 minutes at 1173K in oxygen atmosphere, and three kinds of parameters on temperature and time were investigated for the thick films on BaTiO3. The electrical resistivities were evaluated on the systems of the film/BaTiO3 and the conditions of 1173K and 420 minute-keeping gave a superconductivity. Furthermore, the interfaces between the semiconductor and the film of superconductor were also investigated by an EPMA to show a diffusion of Cu from Y1Ba2Cu3O7-x for both methods of the joining. There seemed to be existing non-superconducting compounds, however a superconductive film on the semiconductive BaTiO3 can be formed by optimizing the joining conditions.抄録全体を表示PDF形式でダウンロード (1829K) -
間崎 啓匡, 安岡 宏, 垣花 眞人, 吉村 昌弘1993 年 40 巻 11 号 p. 1096-1100
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーWe studied the ac-magnetic response of Co-doped YBa2Cu3O7-d oxide superconductors, YBa2Cu3-xCoxO7-d (x=0-0.5), in terms of complex susceptibility χ=χ'-iχ". The samples were synthesized by the polymerized complex method. We found the onset temperature decreased with increasing x, and for x ?? 0.4, no superconducting transition was observed down to 5 K. The transition width ΔT(10-90%) for the sample of x=0.05 is 1.9 K, which is much better than that of the specimens prepared by the ordinary treatment. The transition width was also found to increase as x increases. Details of the experiment are presented together with some discussion of the coupling phase involved.抄録全体を表示PDF形式でダウンロード (248K) -
ラマン分光法の高温超伝導体への応用(1)垣学 眞人, 藤森 宏高, 八島 正知, 吉村 昌弘, 間崎 啓匡, 安岡 宏1993 年 40 巻 11 号 p. 1101-1106
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーWe have investigated the phonon Raman spectra of YBa2Cu3-xCoxO7-d ceramic samples prepared by a polymerized complex method using Raman microprobe collection optics. Defect induced Raman scattering from Cu(1)-O(1) chains has been observed in Co-substituted samples, suggesting that Co predominantly enters the chain site. With increasing Co content the frequencies of the Ba, Cu(2), 0(2)-0(3) and the apex oxygen 0(4) vibrational modes along caxis change considerably. The changes are compared with those of interatomic bond distances as obtained by neutron diffraction and they indicate charge transfer effects between the CuO chain and the CuO2 planes with increasing Co substitution. It is suggested that the O(4) mode is sensitive to small changes of the charge balance between the chain and the plane.抄録全体を表示PDF形式でダウンロード (332K) -
Yoshimoto Wanibe, Takashi Itoh, Yoshiharu Terada, Takashi Ohara1993 年 40 巻 11 号 p. 1109-1112
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーIn order to examine the size distribution of non-spherical objects by means of measurements made on the random plane sections, the sectioned figures are scanned by an image analyzer. The dimensionless shape function necessary for evaluation of the distribution can be statistically determined. The function is observationally compared to the microscopic aspects and quantitatively contrasted with the previous results summarized by the different measurement and analysis of the identical samples.抄録全体を表示PDF形式でダウンロード (225K) -
Yoshimoto Wanibe, Takashi Itoh, Yoshiharu Terada, Takashi Ohara1993 年 40 巻 11 号 p. 1113-1116
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーThe size distribution of non-spherical objects is stereologically estimated by measuring the unidirectional maximum diameters of the sectioned figures, in consideration of the dimensionless shape functions having been previously determined on the basis of the outlines of the figures. The distributions obtained as histograms are also analyzed according to the compound log normal law previously proposed for quantitative comparison.抄録全体を表示PDF形式でダウンロード (233K) -
Yoshimoto Wanibe, Takashi Itoh, Yoshiharu Terada, Takashi Ohara1993 年 40 巻 11 号 p. 1117-1120
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーFrom measurements made on random sections of non-spherical objects, the shape functions have been statistically determined and the size distributions have been able to be stereologically estimated. Then the distributions obtained as histograms have been summarized by using the proposed compound log normal law. The results are quantitatively compared with the other corresponding ones which have been procured from the measurements made on the projected shadows of the identical objects. According to discussion on the effect of the shape functions on the size distributions, mean values of the size estimated on the usual assumption of spherical objects contain the relative errors amounting to 10-40% at the circularity of even less than 0.98.抄録全体を表示PDF形式でダウンロード (206K) -
山口 敏彦, 井畑 康, 安藤 新二, 三浦 秀士, 本田 忠敏1993 年 40 巻 11 号 p. 1121-1125
発行日: 1993/11/15
公開日: 2009/12/04
ジャーナル フリーThe relationship between the behavior of fatigue crack growth and the pattern of fractured surface was investigated on the sintered irons and alloyed steels for various stress ratios by using 1/2 compact type specimens. The results obtained were summarized as follows:
(1) The fracture pattern in the fatigue crack growth on the sintered ferrous materials consisted of shear and intergranular fractures, striation like pattern, and pore surface.
(2) The fracture surface reflected the shear and local intergranular fractures in the region of low crack growth rate, while most of the fracture surface were occupied by the straiation like pattern in the region of high crack growth rate.
(3) As the stress ratio increased, the fracture surface in the fatigue crack growth became coarser and many microcracks appeared within the facets. This behavior was independent on the density and the addtional alloying elements.抄録全体を表示PDF形式でダウンロード (4300K) -
山本 良治, 山田 正二, 本川 惺, 志垣 憲良1993 年 40 巻 11 号 p. 1126-1130
発行日: 1993/11/15
公開日: 2009/05/22
ジャーナル フリーTo define the optimum formation condition of ammonium tungsten bronze (ATB) which is very important intermediate for production of ultrafine tungsten, thermal decomposition of monoclinic and orthorhombic ammonium paratungstate (APT) was studied by thermogravimetry and differential thermal analysis in various atmospheres. The intermediate has been investigated by X-ray diffraction analysis and nitrogen measurement.
ATB was formed in hydrogen, in a mixture of nitrogen and ammonia, in nitrogen, in argon, in air and in oxygen atmosphere respectively. The amount of ATB formed during thermal decomposition of APT depended on the degree of proceeding of thermal decomposition near by 630 K. In case of much sample amount, reaction rate was reduced due to the endothermic reaction related to thermal decomposition of ammonia and water in crystallization.
A small amount of ammonia was necessary for a stable formation of ATB, and the nitrogen content was above 0.8 % in single-phase ATB.抄録全体を表示PDF形式でダウンロード (317K) -
寺田 修, 斎藤 実, 鈴木 寿1993 年 40 巻 11 号 p. 1131-1135
発行日: 1993/11/15
公開日: 2009/12/04
ジャーナル フリーFormation of micro-pores in TiC-Mo2C -Ni cermet with the addition of zirconium carbide(ZrC) up to 6 mass% was mainly studied. It was assumed that zirconium oxide(ZrO2) formed on the surface of ZrC particles during preparation of mixed powder was reduced in the liquid phase which appeared at sintering temperature, resulting in the formation of pores. It was shown that, when the green compact was held under the solid state in a vaccum at temperature of 1250°C before sintering, the tendency of pore-formation was suppressed with increasing holding time and carbon content of the alloy. The well known phenomenon, that is, the increased creep strength of cermet due to ZrC addition was attributed to the decrease of carbon content caused by the reduction of ZrO2.抄録全体を表示PDF形式でダウンロード (4648K)
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