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用复数阻抗平面图法测定了 MgO 掺杂的 ZrO_2的电导率。在所研究的组成范围内,随着 MgO 的含量从4.7mol%增加到约8.2mol%时,电导率增加并达到一个峰值。在1000℃时,含8.2mol% MgO 的 ZrO_2 σ=2.43×10~(-2)(Ω·cm)~(-1)。当 MgO 含量进一步增加时,电导率逐步降低。由于 ZrO_2的单斜相与四方相之间的转变在电导率-温度的函数关系上,于900—1150℃的范围内观察到升温与降温过程所形成的热迥线现象。表明除了立方萤石型结构的 ZrO_2外,四方固溶体的 ZrO_2也具有高的氧离子电导率。在“空气,Pt|ZrO(MgO)|Pt,O_2+N_2”型的氧浓差电池中测定了固体电解质的氧离子迁移数,并对结果进行了讨论.
The conductivity of MgO-doped ZrO 2 was measured by complex impedance method. Within the composition range studied, the conductivity increased and reached a peak as the MgO content increased from 4.7 mol% to about 8.2 mol%. At 1000 ℃, the content of ZrO_2 with 8.2mol% MgO is 2.43 × 10 -2 (Ω · cm) -1. As the MgO content further increases, the conductivity decreases gradually. Due to the transition between monoclinic phase and tetragonal phase of ZrO 2, the thermal line formed during heating and cooling was observed in the range of 900-1150 ℃ as a function of conductivity-temperature. It shows that besides the cubic fluorite-type ZrO 2, tetragonal solid solution ZrO 2 also has high oxygen ion conductivity. The oxygen ion mobility of the solid electrolyte was measured in an oxygen concentration cell of air, Pt | ZrO (MgO) | Pt, O_2 + N_2 "type and the results were discussed.