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

共 19 条

[11] MODEL-CALCULATIONS ON SOME FEASIBLE 2-STEP WATER SPLITTING PROCESSES [J].

LUNDBERG, M .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 1993, 18 (05) :369-376

[12] AN EXPERIMENTAL INVESTIGATION OF EXTRAPOLATION METHODS IN THE DERIVATION OF ACCURATE UNIT-CELL DIMENSIONS OF CRYSTALS [J].

NELSON, JB ;

RILEY, DP .

PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1945, 57 (321) :160-177

[13] ADSORPTION OF CO2 ON OXYGEN-DEFICIENT MAGNETITE - ADSORPTION ENTHALPY AND ADSORPTION-ISOTHERM [J].

NISHIZAWA, K ;

KODAMA, T ;

TABATA, M ;

YOSHIDA, T ;

TSUJI, M ;

TAMAURA, Y .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1992, 88 (18) :2771-2773

[14] Oxygen nonstoichiometry of spinel LiMn2O4-delta [J].

Sugiyama, J ;

Atsumi, T ;

Hioki, T ;

Noda, S ;

Kamegashira, N .

JOURNAL OF ALLOYS AND COMPOUNDS, 1996, 235 (02) :163-169

[15] COMPLETE REDUCTION OF CARBON-DIOXIDE TO CARBON USING CATION-EXCESS MAGNETITE [J].

TAMAURA, Y ;

TABATA, M .

NATURE, 1990, 346 (6281) :255-256

[16] KINETIC-STUDY OF THE FORMATION OF CATION-EXCESS MAGNETITE [J].

TSUJI, M ;

TOGAWA, T ;

WADA, Y ;

SANO, T ;

TAMAURA, Y .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1995, 91 (10) :1533-1538

[17]

WATANABE S, 1960, NIHON KINZOKU SHI, V24, P405

[18]

Wendt H., 1988, HYDROGEN ENERGY CARR, P166

[19]

ZINOVIK MA, 1984, ZH NEORG KHIM+, V29, P1811

← 1 2 →