Ca または Sr 置換ランタンクロマイトの高温還元雰囲気での安定性(<特集>セラミックス)

概要

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Lanthanum chromites ((La, A)(Cr, M)0_3, ; 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℃, 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 Cadoped, 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.
社団法人日本材料学会の論文
1996-06-15