Abstract
A high-temperature neutron diffraction study has been carried out onLa0.75Sr0.25CrO3 compound in the temperature range 300–1400 K. On doping the parent compoundLaCrO3 with Sr at the La site,the orthorhombic (Pbnm) to rhombohedral () structural transition shifts to lower temperatures. From quantitative Rietveld analysis it is foundunequivocally that there is a two-phase coexistence (orthorhombic and rhombohedral phases with∼89 and 11 weight%, respectively) in the temperature range 300–470 K anda three-phase coexistence (with a new cubic phase with space groupPm3m) in the temperature range 480–1400 K. The weight percentages ofthe orthorhombic, rhombohedral and cubic phases were found to be∼49%, 37% and 14%, respectively, in the temperature range 480–1300 K, while over 1350–1400 K, theaverage weight percentages of orthorhombic, rhombohedral and cubic phases were found to be∼41%, 41% and 18%, respectively. The coefficients of volume thermal expansion and linearthermal expansion have been determined for all three phases. The importance of thepresent study has been discussed for practical applications of the studied compound insolid oxide fuel cells.
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