Protonic and Native Conduction in Sr‐Substituted LaPO4 Studied by Thermoelectric Power Measurements
Protonic and Native Conduction in Sr‐Substituted LaPO4 Studied by Thermoelectric Power Measurements
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通过热电功率测量研究 Sr 取代的 LaPO4 中的质子传导和自然传导
DOI：
10.1149/1.1838805
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发表时间：
1998
影响因子：
3.9
通讯作者：
Y. Ito
中科院分区：
文献类型：
--
作者：
K. Amezawa;S. Kjelstrup;T. Norby;Y. Ito
热电功率的测量应用于研究5摩尔% Sr取代的LaPO 4中的电导率作为温度（600至900°C）、水蒸气分压（0.2至6 kPa）和氧分压（4至100 kPa）的函数。基于热熵产生和电荷转移的热力学处理，导出了传导质子、氧离子和电子缺陷的材料的热电势表达式。5摩尔%锶取代的磷酸镧的实验数据解释质子传导，和一些额外的传导，可能是由电子空穴。在空气中，600°C时pH 2 O > 1 kPa，质子输运数为1; 700°C时pH 2 O > 3 kPa，质子输运数为1。在潮湿的大气中，质子在该材料中的输运熵在600 ~ 800°C的潮湿大气中几乎是恒定的，为112 ± 2 J mol-1 K-1。
Measurements of the thermoelectric power were applied to investigate the electrical conductivity in 5 mol % Sr-substituted LaPO 4 as a function of temperature (600 to 900°C), water vapor partial pressure (0.2 to 6 kPa), and oxygen partial pressure (4 to 100 kPa). Expressions of the thermoelectric power for materials conducting protons, oxide ions, and electronic defects were derived, based on a thermodynamic treatment of entropy production by heat and charge transfer. The experimental data for 5 mol % Sr-substituted LaPO 4 were interpreted in terms of protonic conduction, and some additional conduction, possibly by electron holes. In air, the proton transport number is unity at 600°C when p H2 O > 1 kPa, and at 700°C when p H2 O > 3 kPa. In wet atmospheres, the transported entropy of protons in this material was found to be nearly constant, 112 ± 2 J mol -1 K -1 at 600 to 800°C in wet atmospheres.