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用高温固体合成法制备了经验分子式为Ba12Y4.67Ti8O35的导电陶瓷.利用交流阻抗谱技术、氧浓差电势测量和热电效应测量等方法表征了材料的导电性能.研究指出,该材料是一种氧离子/空穴混合导体.在700℃下,材料本体的电导约为2×10-3Ω-1·cm-1,氧离子迁移数为0.35.对700℃下空气、O2和N2气氛中的交流阻抗谱数据进行了等效电路拟合.拟合指出,在空气和O2气氛中,氧离子的扩散阻抗谱不能明显地观察到是因为氧离子电导通路被空穴电导短路;而在N2气氛中,阻抗谱在低频段表现出特征的扩散阻抗.
The conductive ceramic with empirical formula Ba12Y4.67Ti8O35 was prepared by high temperature solid synthesis method. The conductive properties of the material were characterized by AC impedance spectroscopy, oxygen concentration potential measurement and thermoelectric effect measurement. It was pointed out that the material is an oxygen Ion / hole hybrid conductor at 700 ℃, the body of the material has a conductivity of about 2 × 10-3Ω-1 · cm-1, oxygen ion migration number of 0.35.For 700 ℃ air, O2 and N2 atmosphere in the exchange Impedance spectrum data were fitted by an equivalent circuit.The fitting points out that the diffusion impedance spectra of oxygen ions can not be obviously observed in the air and O2 atmosphere because the oxygen ion conductance path is shorted by hole conductance and in the N2 atmosphere The impedance spectrum exhibits a characteristic diffusion impedance at low frequencies.