Spinel solid solutions in the Li-Fe-Mn-O system

被引：12
作者：
Grygar, T [1 ]
Bezdicka, P
Vorm, P
Jordanova, N
Krtil, P
机构：
[1] Acad Sci Czech Republ, Inst Inorgan Chem, CZ-25068 Rez, Czech Republic
[2] Acad Sci Czech Republ, Inst Geophys, CR-14131 Prague 4, Czech Republic
[3] Acad Sci Czech Republ, J Heyrovsky Inst Phys Chem, Prague 18000 8, Czech Republic
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2001年 / 161卷 / 01期
关键词：
Li-Fe-Mn-O spinels; solid solution; X-ray diffraction; voltammetry;
D O I：
10.1006/jssc.2001.9310
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The ranges of Li-Fe-Min composition in which single-phase microparticulate spinel oxides are formed by heating in air were determined. The aim was to reevaluate previously published reports on binary solid solutions between LiFe5O8 and Li-Mn-O spinels by covering the whole possible range of (Li, Fe, Mn)(3)O-4 spinels with Mn valence higher than 3. To sensitively detect possible heterogeneity of the elemental distribution or phase composition, chemical and X-ray powder diffraction analyses were used, temperature dependence of magnetic susceptibility was obtained for samples rich in Fe, and electrochemical reductive dissolution was studied by means of voltammetry of microparticles. Instead of a continuous series of solid solutions, three regions were found with different dependence of lattice parameters on elemental composition. A region of nonuniform solid solutions was found at Fe/(Fe+Mn)>0.4 and Mn valence >3.2. (C) 2001 Academic Press.
引用
收藏
页码：152 / 160
页数：9
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