TY - JOUR
T1 - Oxygen nonstoichiometry of the perovskite-type oxide La 1-xCaxCrO3-δ (x=0.1, 0.2, 0.3)
AU - Onuma, Shigenori
AU - Yashiro, Keiji
AU - Miyoshi, Shogo
AU - Kaimai, Atsushi
AU - Matsumoto, Hiroshige
AU - Nigara, Yutaka
AU - Kawada, Tatsuya
AU - Mizusaki, Junichiro
AU - Kawamura, Kenichi
AU - Sakai, Natsuko
AU - Yokokawa, Harumi
N1 - Funding Information:
This study was supported by the basic research and development of microsolid oxide fuel cells in '00 from NEDO of Japan and by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (A), 13305046, 2001.
PY - 2004/10/29
Y1 - 2004/10/29
N2 - The oxygen nonstoichiometry, δ, of La1-xCa xCrO3-δ (x=0.1-0.3) was measured by means of thermogravimetry as a function of oxygen partial pressure, P(O2), temperature, T, between 1073 and 1373 K, and the content of calcium, x. In any compositions, δ becomes larger and is getting closer to δ=x/2 with decreasing P(O2). At the same P(O2), δ of La 1-xCaxCiO3-δ increases with increasing T and x. There is almost no difference in oxygen nonstoichiometry between Ca-doped lanthanum chromite and Sr-doped lanthanum chromite. Defect chemical analysis was performed taking defect interaction into consideration. The nonstoichiometry curves were reproduced well by the proposed defect model and the obtained thermodynamic parameters. The influence of defect interaction on defect formation energy can be mainly attributed to change in interatomic potential due to defect-induced lattice expansion.
AB - The oxygen nonstoichiometry, δ, of La1-xCa xCrO3-δ (x=0.1-0.3) was measured by means of thermogravimetry as a function of oxygen partial pressure, P(O2), temperature, T, between 1073 and 1373 K, and the content of calcium, x. In any compositions, δ becomes larger and is getting closer to δ=x/2 with decreasing P(O2). At the same P(O2), δ of La 1-xCaxCiO3-δ increases with increasing T and x. There is almost no difference in oxygen nonstoichiometry between Ca-doped lanthanum chromite and Sr-doped lanthanum chromite. Defect chemical analysis was performed taking defect interaction into consideration. The nonstoichiometry curves were reproduced well by the proposed defect model and the obtained thermodynamic parameters. The influence of defect interaction on defect formation energy can be mainly attributed to change in interatomic potential due to defect-induced lattice expansion.
KW - Defect chemistry
KW - Defect interaction
KW - Lanthanum chromite
KW - Oxygen nonstoichiometry
KW - Solid oxide fuel cells
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U2 - 10.1016/j.ssi.2004.07.037
DO - 10.1016/j.ssi.2004.07.037
M3 - Article
AN - SCOPUS:10044264268
SN - 0167-2738
VL - 174
SP - 287
EP - 293
JO - Solid State Ionics
JF - Solid State Ionics
IS - 1-4
ER -