LaCrO_3の焼結挙動に及ぼすTi置換と雰囲気の影響

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In order to improve the sinterability of LaCrO_3, which is one of candidate materials for interconnector of Solid Oxide Fuel Cell, the effect of sintering in reducing atmosphere and Ti substitution of Cr on the sinterability was investigated. Judging from the sintering temperature dependence of density, both of sintering in reducing atmosphere and Ti substitution of Cr improved the sinterability of LaCrO_3. Compared with the sample sintered in air, sinterability of the samples sintered in reducing atmosphere was most promoted in a case of small amount of Ti substitution. X-ray photoelectron spectroscopy analysis of the surface of the sample revealed an existence of Cr^<6+> ion in LaCrO_3 sintered in air. On the contrary, Cr^<6+> ion was not obviously observed in LaCrO_3 sintered in reducing atmosphere as well as LaCr_<0.7>Ti_<0.3>O_3 sintered in air and in reducing atmosphere. Therefore, Ti substitution of Cr and sintering in reducing atmosphere have the same effect on suppression of CrO_3 generation, which is harmful for sintering of LaCrO_3. Microstructure observation revealed that grain growth of LaCrO_3 sintered in air was pronounced, while that of LaCrO_3 sintered in reducing atmosphere and LaCr_<0.8>Ti_<0.2>O_3 sintered in air was negligible. Activation energy for shrinkage of LaCrO_3 and LaCr_<0.95>Ti_<0.05>O_3 sintered in reducing atmosphere was 262kJ・mol^<-1> and 153kJ・mol^<-1>, While that of LaCr_<0.8>Ti_<0.2>O_3 sintered in air was greater than those of LaCrO_3 and LaCr_<0.95>Ti_<0.05>O_3 sintered in reducing atmosphere. The effect of Ti substitution on sintering of LaCrO_3 should be different in rate controlling process from the effect of sintering under reducing atmosphere.
2005-05-01

LaCrO_3の焼結挙動に及ぼすTi置換と雰囲気の影響

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