Oxygen nonstoichiometry of the copper-substituted lanthanum cobaltite LaCo0.9Cu0.1O3-δ

被引：0
|
作者：
Zuev, AY [1 ]
Petrov, AN [1 ]
Pankov, DV [1 ]
机构：
[1] Ural State Univ, Dept Chem, Ekaterinburg 620083, Russia
来源：
SOLID OXIDE FUEL CELLS (SOFC VI) | 1999年 / 99卷 / 19期
关键词：
D O I：
暂无
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Oxygen nonstoichiometry of LaCo0.9Cu0.1O3-delta has been studied as a function of temperature (1123-1473 K) and oxygen pressure (10(-3)=Po-2, atm =1) by using both thermogravimetry (TG) method and coulometric titration in a solid electrolyte cell. The absolute values of oxygen nonstoichiometry delta are calculated from the results of the direct reduction of the samples of LaCo0.9Cu0.1O3-delta in a flux of hydrogen in the TG cell. It was established that oxygen nonstoichiometry has a deficient character (positive delta values). A defect model is proposed for LaCo0.9Cu0.1O3-delta. It is concluded that oxygen vacancies v(o)(..) and "delocalized" electrons are being formed when oxygen is removed from the oxide lattice. The equilibrium constants and enthalpy of defects formation were calculated.
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页码：424 / 431
页数：8
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