Electrochemical Determination of the Oxygen Permeability of La1 − x Ca x CrO3 − δ ( x = 0.27 )
Electrochemical Determination of the Oxygen Permeability of La1 − x Ca x CrO3 − δ ( x = 0.27 )
复制标题
电化学测定 La1 − x Ca x CrO3 − δ ( x = 0.27 ) 的透氧率
DOI：
10.1149/1.1393614
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发表时间：
2000
影响因子：
3.9
通讯作者：
H. Yoo
中科院分区：
文献类型：
--
作者：
Doh;H. Yoo
用电化学渗透池测定了La0.73Ca0.27Cr0.98O3-δ在温度和氧分压分别为1173 ≤ T/K ≤ 1373和10 - 18 ≤ pO 2/atm ≤ 1范围内的氧渗透率。由此导出了离子部分电导率，并证明其等温变化为σ离子p O2 m，氧指数m随p O2在其范围内的增加而从m0变化到-1/2到+1/2。离子载体被确定为，通过电迁移实验，作为在整个p O2范围内的氧阴离子，从而表明反弗伦克尔无序作为大多数离子缺陷。离子电导率，氧空位扩散系数和氧化还原平衡常数与文献数据进行了详尽的比较。
The oxygen permeability of La 0.73 Ca 0.27 Cr 0.98 O 3-δ was measured in the ranges of temperature and oxygen partial pressure, 1173 ≤ T/K ≤ 1373 and 10 -18 ≤ p O2 /atm ≤ 1, respectively, by using electrochemical permeation cells of which all the mechanical and electrochemical leakage sources were eliminated by cell design and operation. The ionic partial conductivity was derived therefrom and turned out to vary isothermally as σ ion p O2 m with the oxygen exponent m changing from m 0 to -1/2 to +1/2 as p O2 increases in its range examined. The ionic carrier was identified, via electrotransport experiments, as being oxide anions over the entire p O2 range, thus suggesting the anti-Frenkel disorder as being the majority ionic defects. The ionic conductivity, and the oxygen vacancy diffusivity and redox equilibrium constant therefrom are exhaustively compared with the literature data.