Abstract
The presence of SmCrO 4 is experimentally established. In Mg 2+-substituted SmCrO 3, single-phase perovskite Sm(Cr 1− x Mg x )O 3, where x=0–0.23, are formed at ∼830°C by decomposition of Sm(Cr 1− x Mg x )O 4 which crystallizes at 530–570°C from amorphous materials prepared by the hydrazine method. Sm(Cr 1− x Mg x )O 3 solid solution powders consisting of submicrometer-size particles are sinterable; dense materials can be fabricated by sintering for 2 h at 1700°C in air. The relative densities, grain sizes, and electrical conductivities increase with increased Mg 2+ content. Sm(Cr 0.77Mg 0.23)O 3 materials exhibit an excellent direct current electrical conductivity of 2.2×10 3 S m −1 at 1000°C.
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