巻号一覧
60 巻, 7 号
July
選択された号の論文の7件中1～7を表示しています
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研究論文
研究論文
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桜井 裕也, Kolodiazhnyi Taras, 道上 勇一, 室町 英治, 田邊 雄一, 菊池 彦光2013 年 60 巻 7 号 p. 313-318
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスRecently, a new calcium-ferrite type chromium oxide, NaCr2O4, was synthesized under high pressure of 7 GPa, and was found to show the unconventional colossal magnetoresistance (CMR) effect below the canted-antiferromagnetic transition temperature of TN = 125 K. In this paper, in addition to crystal structure data and magnetic properties, we show the temperature dependence of the electrical resistivity under 0, 3, and 9 T and the field dependence of magnetoresistance ratio at 45, 60, and 80 K. These clearly support the unconventional nature of the CMR effect. We discuss the existence of holes on oxygen ions, and propose a possible mechanism of CMR in NaCr2O4, in which the spin frustration and the holes play an important role. A guide to find new CMR compounds is also presented.抄録全体を表示PDF形式でダウンロード (778K) -
世利 修美, 鈴木 哲広, 佐々木 大地2013 年 60 巻 7 号 p. 319-324
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスNiAl2O4 was tried to make by metallic corrosion with chloride as a catalyst in ethanol. As synthesis of NiAl2O4, two ways were carried out: ①nickel was corroded with addition of aluminum chloride, and ②aluminum was corroded with nickel chloride. The corrosion products obtained by two methods were hydrolyzed, adjusted pH and then fired. It was found that the powder fired at 1073 K and over by two methods was of NiAl2O4 spinel whose diameter was 0.4 to 30 µm. The above results were considered as electrochemical and corrosion phenomena.抄録全体を表示PDF形式でダウンロード (1116K) -
佐々木 大地, 世利 修美2013 年 60 巻 7 号 p. 325-329
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスZnAl2O4 was obtained by corrosion synthesis which produced mixtures of zinc alkoxide by metallic zinc dissolution in ethanol and aluminum ions by addition of aluminum chloride as a catalyst. The corrosion product became ZnAl2O4 when the mixtures were hydrolyzed, pH-adjusted, and fired at temperature higher than 873 K. It is shown that the ZnAl2O4 powder has the particle size distribution of 0.4 to 10 µm. It is considered that the corrosion synthesis of a ZnAl2O4 production has some features of fast reaction in ethanol and well blending circumstances in ion size level condition.抄録全体を表示PDF形式でダウンロード (980K) -
廣田 光智, 柏井 太郎, 佐々木 大地, 齋藤 務, 世利 修美2013 年 60 巻 7 号 p. 330-333
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスAttempts have been made to obtain SrTiO3 powder by applying dissolution reaction of titanium in solution with mixture of hydrogen peroxide and ammonium hydroxide. The reaction product obtained was peroxotitanium anion containing strontium chloride. The product was filtered and sintered at 873 K～1473 K for 7.2 ks. The XRD analysis proves that the powders were identified as SrTiO3. Average size of the particle was around 0.08～30 µm and it shape is almost polygon lump by the FE-SEM observations.抄録全体を表示PDF形式でダウンロード (724K) -
横田 勝, 玉置 洸司郎, 齋藤 範三, 佐分利 敏雄, 荻 崇, 栃原 美佐子, 小西 康裕2013 年 60 巻 7 号 p. 334-340
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスMetal ion reducing bacteria “Shewanella algae” were used in this experiment to directly reduce copper oxide powder to Cu(0) powder. The liquid medium used for culturing Shewanella algae contained sodium lactate as the electron donor and iron(III) citrate as the electron acceptor.
Results obtained are as follows:
(1)When Cu2O powder was added in the liquid medium, the population of Shewanella algae grew exponentially in two stages. The first exponential growth occurred about 20 hours after the experiment began, and the second growth occurred about 200 hours after the experiment began. No growth of bacteria occurred when CuO powder was added in the liquid medium.
(2)When Cu2O powder was added in the liquid medium, Cu concentration in the liquid medium maintained 0.01 mg/m3 during the first inductive phase and maintained 7 mg/m3 during the second inductive phase. Cu concentration decreased drastically during the second exponential growth phase. When the bacterial culture reached the stationary phase, Cu concentration still decreased slightly and dropped to approximately 0.07 mg/m3 at the end of the experiment.
(3) Three different types of reduced Cu(0) particles were observed: ultra fine particles on the surface of Shewanella algae cells; spherical, triangular and hexagonal particles of sub-micron size obtained from the liquid medium; and many particles which are similar in shape and size to raw Cu2O powder.抄録全体を表示PDF形式でダウンロード (1972K)
本会記事
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2013 年 60 巻 7 号 p. Pref7_1-
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスPDF形式でダウンロード (191K) -
2013 年 60 巻 7 号 p. Mtg7_2-Mtg7_6
発行日: 2013/07/15
公開日: 2013/09/05
ジャーナル オープンアクセスPDF形式でダウンロード (639K)
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