Structure and properties of magnetite formed in the presence of nickel(II) ions

被引：25
作者：
Ishikawa, T
Nakazaki, H
Yasukawa, A
Kandori, K
Seto, M
机构：
[1] Osaka Univ Educ, Sch Chem, Osaka 582, Japan
[2] Kyoto Univ, Inst Res Reactor, Kumatori, Osaka 59004, Japan
来源：
MATERIALS RESEARCH BULLETIN | 1998年 / 33卷 / 11期
关键词：
oxides; crystal growth; thermogravimetric analysis (TGA); Mossbauer spectroscopy; electrical properties;
D O I：
10.1016/S0025-5408(98)00162-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fe3O4 particles prepared by oxidation of Fe(OH)(2) precipitated from FeCl2 solutions containing different amounts of Ni2+ from 0 to 30 mol% were examined by various means. The thermogravimetry (TG) results show that the addition of Ni2+ raised the air-oxidation temperature of Fe3O4 particles from ca. 200 to ca. 400 degrees C, which means that the Fe3O4 particles were stabilized to air-oxidation by the doped Ni2+. Fe2+ content of the materials obtained at Ni/(Ni + Fe) greater than or equal to 0.1 mol% was significantly greater than the theoretical Fe2+ content of Fe3O4. Fe-57 Mossbauer spectra indicated that Fe3+ ions in B sites of the Ni-doped Fe3O4 are exchanged in part by Fe2+. The de electrical conductivity was increased from 10(-4) to 10(-2) S cm(-1) by Ni2+ loading. (C) 1998 Elsevier Science Ltd.
引用
收藏
页码：1609 / 1619
页数：11
相关论文
共 21 条
123