Synchrotron X-ray powder diffraction studies on the phase transitions in LiMn2O4

被引：18

作者：

Piszora, P ^{[1
]}

Darul, J ^{[1
]}

Nowicki, W ^{[1
]}

Wolska, E ^{[1
]}

机构：

[1] Adam Mickiewicz Univ, Lab Magnetochem, PL-60780 Poznan, Poland

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 362卷 / 1-2期

关键词：

electrode materials; crystal structure and symmetry; X-ray diffraction; synchrotron radiation;

D O I：

10.1016/S0925-8388(03)00590-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Structural phase transitions of the spinel lithium-manganese oxide, LiMn2O4 (Fd3m at room temperature) in the temperature range of 300-20 K, were investigated using synchrotron and laboratory X-ray powder diffraction. Splitting of the spinel X-ray lines 311, 400, 440, 531, 533 and 622, recorded during the test, evidenced the reversible formation of cubic, orthorhombic and tetragonal structures. The first transformation starts at similar to290 K as a cubic (Fd3m) --> orthorhombic (Fddd) symmetry reduction, and both phases coexist down to 260 K. Below 100 K a second structural transition, orthorhombic --> tetragonal (F4(1)/ddm) was observed, with the coexistence of these two phases down to similar to40 K. The supercell corresponding to 3a x 3a x a (a, spinel unit-cell constant) has been considered for both orthorhombic and tetragonal polymorphs of LiMn2O4, based on the appearance of (2.10.0) superstructure X-ray reflection. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：231 / 235

页数：5

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