Ionic Transference Numbers and Electrical Conduction in MgAl2O4 Spinel
Ionic Transference Numbers and Electrical Conduction in MgAl2O4 Spinel
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DOI：
10.1111/j.1151-2916.1983.tb09967.x
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发表时间：
1983
影响因子：
3.9
通讯作者：
E. Sonder
中科院分区：
文献类型：
--
作者：
E. Sonder
通过测量两个面上具有不同氧分压的样品产生的电势，获得 T=1000 至 1700 K 和氧压 105 至 10−11 Pa 的离子迁移数。还在相同的温度和压力范围内测量了相同样品的交流和直流电导率。结果表明，MgAl2O4 中的传导几乎是纯离子的，并且电导率不受环境氧压或高达 0.1% 的铁杂质的影响。提出载流子是由于阳离子非化学计量而存在的阳离子空位。
Ionic transference numbers were obtained for T=1000 to 1700 K and for oxygen pressures 105 to 10−11 Pa by measuring potentials produced across samples having different oxygen partial pressures at the two faces. Alternating and direct current conductivities were also measured for the same samples over the same range of temperature and pressure. The results show that conduction in MgAl2O4 is almost purely ionic and that the conductivity is not greatly influenced by either ambient oxygen pressure or iron impurity up to 0.1%. It is proposed that the current carriers are cation vacancies that are present as a result of cation nonstoichiometry.