Electrical properties of LiMn2O4-delta at temperatures 220-1100K

The work presents the results of low-temperature (220-300 K) studies of ele ctrical conductivity and thermoelectric power for manganese spinel obtained by various methods. It has been shown that charge transport takes place th rough the small polaron mechanism. The results of high-temperature (300-110 0 K) studies of electrical conductivity and thermoelectric power carried ou t in the thermodynamic equilibrium conditions as a function of temperature and oxygen pressure (10(-2) - 1 atm) in the whole range of the LiMn2O4-delt a phase stability are also presented. It has been shown that an effective r eaction related to the deviation from stoichiometry is the reaction Mn+4 e(-)double left right arrow Mn+3. (C) 1999 Published by Elsevier Science B. V. All rights reserved.