Differential scanning calorimetry -: An essential tool to characterize LiMn2O4 spinel

被引:7
作者
Amarilla, JM [1 ]
Rojas, RM [1 ]
机构
[1] CSIC, Inst Ciencia Mat Madrid, Madrid 28049, Spain
关键词
DSC; LiMn2O4; spinel; phase transformation;
D O I
10.1023/A:1025145910834
中图分类号
O414.1 [热力学];
学科分类号
摘要
A series of LiMr2O4 samples with nominal Li/Mn molar ratio=1/2 has been synthesized at 700 and 750°C by the ceramic procedure from Mn2O3 and several lithium sources. Lattice parameters determined from X-ray diffraction patterns are within a narrow range, from ac=8.238(1) A to ac=8.245(1) Å, Δa c/ac<0.1%. The study by differential scanning calorimetry (DSC) shows that the temperatures of the cubic (Fd3m)↔orthorhombic (Fddd) phase transition are spread off in a wide range, from -30 to -2°C for the exothermic C→O phase transition, and from -21 to +13°C for the endothermic O→C transformation. Relationships between the lattice parameter values, the temperature of the phase transformation, and the stoichiometry of the LiMn2O4 samples are pointed out. The DSC technique, which reveals more sensitive than X-ray diffraction to very small variations of composition, is put forward as an essential technique to characterize LMn2O4 samples.
引用
收藏
页码:191 / 200
页数:10
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