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Measurement of the Onsager coefficients of mixed ionic-electronic conduction in oxides

机译:氧化物中离子电导混合的Onsager系数的测量

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In the phenomenon of mixed ionic-electronic conduction in solid state, a flow of mobile ions (J_i) may be induced not only directly by their own electrochemical potential gradient (▽η_i), but also indirectly by that of electrons (▽η_e), and vice versa for a flow of electrons (J_e) or J_m=-L_(mn)▽η_n (m,n=i,e). We have recently succeeded in determining experimentally all the four Onsager coefficients L_(mn) on the system of TiO_2, and reported [Phys. Rev. Lett. 97, 255901 (2006)] that the Onsager reciprocity is verified within 1.3% error bound (L_(ie)/L_(ei)=0.993±0.013) and contrary to the general belief, the cross coefficient is not only not negligible but also even larger than a direct one (1.5 ≤ L_(ie)/L_(ii) ≤ 3.7). This paper details the experimental technique which allows one to measure all the Onsager coefficients in a mixed conductor oxide.
机译:在固态的混合离子-电子传导现象中,不仅可以通过自身的电化学势梯度(▽η_i)诱导移动离子(J_i)的流动,还可以通过电子(▽η_e)间接诱导的流动离子的流动,反之亦然,对于电子流(J_e)或J_m = -L_(mn)▽η_n(m,n = i,e)。我们最近成功地通过实验确定了TiO_2系统上所有四个Onsager系数L_(mn),并报道了[Phys。牧师97,255901(2006)]证实了Onsager互易性在1.3%的误差范围内(L_(ie)/ L_(ei)= 0.993±0.013),并且与一般的看法相反,交叉系数不仅不可忽略,而且甚至大于直接值(1.5≤L_(ie)/ L_(ii)≤3.7)。本文详细介绍了一种允许在混合导体氧化物中测量所有Onsager系数的实验技术。

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