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Lanthanum chromites ((La, A) (Cr, M) O3; A=Ca, Sr, M=Co, Ni, Cu, Zn) were synthesized and characterized from their density, thermal expansion coefficient and chemical stability. Cobalt doped lanthanum calcium chromites with La-site/Cr-site ratio>1 were densely sintered at 1400°C, and it is possible to adjust the thermal expansion coefficient to that of YSZ by controlling the amount of dopants. Lanthanum strontium chromites with La-site/Cr-site ratio=1 were not densely sintered at lower temperature than Ca-doped, but kept enough strength after reduction treatment. difference of strength change after the reduction treatment between Sr-doped and Ca-doped ones is related to the difference in lattice expansion after the treatment.

Chemical Stability of Ca or Sr Doped Lanthanum Chromites under High Temperature Reduced Atmosphere.