Thermodynamic Properties of Li_1+xMn_2xO₄
and Li_0.5Mn₂O₄ Spinels

L. A. Reznitskii

Moscow State University, Vorob’evy gory, Moscow, 119899 Russia

Received June 5, 2002

Abstract—The enthalpies of formation from simple oxides have been calculated for Li–Mn spinels from the
enthalpies of change in oxygen coordination of a cation using an approximate method. The calculated enthal-
pies of formation from simple oxides and the thermodynamic properties of the simple oxides have been used
to calculate the enthalpies of formation _f H₂₉₈, the Gibbs free energies _f G₂₉₈, and entropies for lithium man-
ganites. Lithium-for-manganese substitution in the octahedral voids of the spinel structure is a low-endother-
micity process.

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