Structural characterisation and physical properties of LiMMnO4 (M = Cr, Ti) spinels

被引：44
作者：
Arillo, MA [1 ]
Cuello, G
López, ML
Martín, P
Pico, C
Veiga, ML
机构：
[1] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan 1, E-28040 Madrid, Spain
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
来源：
SOLID STATE SCIENCES | 2005年 / 7卷 / 01期
关键词：
spinel type oxides; neutron diffraction; electronic conductors; magnetic properties; electrochemistry;
D O I：
10.1016/j.solidstatesciences.2004.10.022
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
New spinel-type phases of general formula LiMMnO4 (M = Cr, Ti), derived from LiMn2O4 by substitution of Mn3+ by Cr3+ or Mn4+ by Ti4+, have been obtained and characterised. Neutron diffraction refinements confirm that both phases crystallise in the Fd3m space group, giving the cation distributions [Li](8a)[CrMn](16d)O-4 and [Li0.66Ti0.34](8a)[Li0.34MnTi0.66](16d)O-4. Electrical conductivity has been examined by various techniques showing that these materials behave as semiconductors. The electrochemical behaviour indicates different oxidation-reduction steps in both cases concomitant with the insertion/deinsertion of lithium in non-reversible processes. X-ray diffraction patterns show that the above process is topotactic in LiCrMnO4. Magnetic data and neutron diffraction measurements show that no long-range magnetic ordering is present, suggesting a spin-glass transition for M = Cr at low temperature, while for M = Ti the presence of non-magnetic ions in the octahedral sublattice provokes an inherent magnetic frustration. (C) 2004 Elsevier SAS. All rights reserved.
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页码：25 / 32
页数：8
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