The high temperature ionic (σ_i) and n-type electronic conductivity (σ_n) of 7.5 mol% MgO-doped partially stabilized ZrO₂ (7.5MgPSZ) were determined using 4 probe total conductivity (in air, 800–1600 °C), and oxygen concentration cell open circuit voltage measurements (1200–1600 °C). The latter involved two distinct cell configurations (Al or Cr-based electrodes versus air). The σ_n values of 4.78 × 10⁻⁴ S.cm⁻¹ at 1600 °C (extrapolated to pO₂ = 1 atm) and activation energy of 424.0 kJ.mol⁻¹ are hereby reported for the first time. The observed ionic conductivity of 0.60 S.cm⁻¹ at 1600 °C and activation enthalpy of 119.5 kJ.mol⁻¹ for the 1400–1600 °C temperature range are both within upper ranges reported for other PSZ materials. This high activation enthalpy suggests a strong defect association between oxide-ion vacancies and acceptor dopant, exceeding typical values observed with trivalent dopants. The reasons for wide literature data ranges on ionic transport are discussed taking into consideration the variable phase content, phase composition, and potential non-equilibrium conditions observed in experiments. The specific case of hysteresis in conductivity versus temperature curves is analyzed in detail. Complementary structural and microstructural characterization, besides thermal expansion behavior, are used to support the analysis of electrochemical performance.

使用 4 探针总电导率（在空气中，800–1600 °C）测定7.5 mol% MgO 掺杂的部分稳定 ZrO ₂ (7.5MgPSZ)的高温离子电导率 (σ _i ) 和 n 型电子电导率 (σ _n ) , 和氧浓差电池开路电压测量 (1200–1600 °C)。后者涉及两种不同的电池配置（铝或铬基电极与空气）。在此首次报道了1600 °C 时的 4.78 × 10 ^-4  S.cm ^-1的 σ _n值（外推到 pO _{2 = 1 atm）和 424.0 kJ.mol} ^-1的 活化能。观察到的离子电导率为 0.60 S.cm ^-1在 1600 °C 和 1400–1600 °C 温度范围内的活化焓为 119.5 kJ.mol ^-1均在其他 PSZ 材料报告的上限范围内。这种高活化焓表明氧化物离子空位和受体掺杂剂之间存在很强的缺陷关联，超过了用三价掺杂剂观察到的典型值。考虑到实验中观察到的可变相含量、相组成和潜在的非平衡条件，讨论了关于离子传输的广泛文献数据范围的原因。详细分析了电导率与温度曲线滞后的具体情况。除了热膨胀行为外，互补的结构和微观结构表征还用于支持电化学性能的分析。