Thermodynamic properties of Sr-doped LaMnO3 perovskite in the La-Sr-Mn-O system

Thermodynamic properties of Sr-doped perovskite-type lanthanum manganites ( LSM) were generated by measuring the electromotive force (EMF) of rest mate rials, using the solid galvanic cell technique. The cell consisted of an an ode (SrO/SrF2), an electrolyte (CaF2 or SrF2) and a cathode (LSM/SrF2). Two types of cells were tested in which type I used a CaF2 electrolyte and typ e II used a SrF2 electrolyte. The activity of SrO substituting into various LSM compositions was calculated using the measured EMF. The Sr content was varied from 0.16 to 0.6 mol, and the temperature of interest varied from 7 00 to 1000 degrees C. It was found that the SrO activity decreased with inc reasing temperature (at fixed composition) and increased with increasing Sr content (at fixed temperature). (C) 1999 The Electrochemical Society. S001 3-4651(98)11-109-6. All rights reserved.