Microwave assisted synthesis of La 1− xSr xCrO 3 ( x=0.05, 0.15 and 0.30) and their thermodynamic characterization by fluoride emf method

Abstract

Three compositions of SrO doped LaCrO 3 (LSC) namely La 1− x Sr x CrO 3 ( x=0.05, 0.15 and 0.30) were synthesized by a novel microwave assisted technique and the thermodynamic activity of SrO ( a SrO) in LSC for the three compositions was measured as a function of temperature over the range 890–1100 K by employing a solid electrolyte emf technique with SrF 2 as the electrolyte. The reference electrode used for all the galvanic cells was SrZrO 3,ZrO 2,SrF 2,O 2/Pt. The SrO potential, Δ G SrO and a SrO for the solid solutions were computed and these values were used to evaluate the compatibility of LSC with the other components of solid oxide fuel cells. The Δ G SrO for these compositions could be represented as −131.6+0.05047 T for 0.05 LSC, −85.2+0.01124 T for 0.15 LSC and −66.7+0.00339 T for 0.30 LSC in terms of kJ mol −1. The SrO potential thus seem to increase with increasing SrO content as expected.