Synthesis of (Li,Mn) ferrites by reaction of ultrafine γ-Fe2O3 with LiMn2O4 spinel at 650°C

被引：13

作者：

Sano, T ^{[1
]}

Tamaura, Y ^{[1
]}

机构：

[1] Tokyo Inst Technol, Res Ctr Carbon Recycling & Utilizat, Dept Chem, Meguro Ku, Tokyo 152, Japan

来源：

MATERIALS RESEARCH BULLETIN | 1999年 / 34卷 / 03期

关键词：

ceramics; oxides; chemical synthesis; X-ray diffraction;

D O I：

10.1016/S0025-5408(99)00022-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

(Li,Mn) ferrites (LMFs; LiyMn2yFe3-3yO4+delta, y = 0.27-0.75, delta = 0.01-0.04) were synthesized by solid-state reaction of ultrafine maghemite (gamma-Fe2O3) with lithium manganese spinel (LiMn2O4) at 650 degrees C. For y less than or equal to 0.5, the LMFs were synthesized in a He gas stream; for y > 0.5, the LIMFs were formed in an air stream at 650 degrees C. In the formation of LMF (y = 0.44), release of oxygen gas was observed at 460 and 650 degrees C in a He gas stream. The oxygen release at 460 degrees C was accompanied by the reaction of LiMn2O4 with gamma-Fe2O3, and the release at 650 degrees C was due to the reaction of the formed LMF and alpha-Fe2O3. The deviation of lattice constant from Vegard's Law was largest at y = 0.5, where all Mn ions were trivalent. (C) 1999 Elsevier Science Ltd.

引用

页码：389 / 401

页数：13

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