Citation: GUO Yin-Tao, YE Qin, XIANG Jun, XU Jia-Huan. Effect of Strontium and Cobalt Co-doping on the Structural and Electrical Properties of PrAlO3 Perovskite Oxides[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(5): 958-964. doi: 10.3969/j.issn.1001-4861.2013.00.155
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Novel Sr- and Co-codoped (Pr,Sr)(Al,Co)O3-δ perovskite oxide conducting ceramics were prepared by citrate process combined with subsequent high-temperature sintering. The phase composition, microstructure and electrical properties of the obtained ceramics were characterized by XRD, SEM and direct current four-wire method. The experimental results show that all the as-prepared Pr0.9Sr0.1Al1-yCoyO3-δ(y=0.1~0.5) ceramics are a single-phase rhombohedral perovskite structure, and their unit cell volumes, relative densities and electrical conductivities increase with increasing y in the doping range, while the increasing rate in electrical conductivity progressively decrease. Furthermore, these samples are a mixed conductor of oxygen ion and hole in air and their electrical conductivities are absolutely dominated by p-type conduction. The temperature dependence of electrical conductivity for Pr0.9Sr0.1Al1-yCoyO3-δ can be described by the small polaron hopping mechanism. For the as-prepared Pr1-xSrxAl0.5Co0.5O3-δ(x=0.1~0.4) ceramics, a second phase (Pr,Sr)CoO3 obviously precipitates when x=0.2, indicating that the solid solubility limit of Sr on A site in this system is between 10at% and 20at%, and the (Pr, Sr)CoO3 phase in samples increases gradually and finally becomes the main phase with further increase in Sr content. It is found that the electrical conductivity of Pr1-xSrxAl0.5Co0.5O3-δ ceramics roughly exhibits a trend of first increase and then decrease with increasing x in the whole examined temperature range, and reaches the maximum value at around x=0.3. Additionally, the semiconductor-to-metal transition in the conduction behavior is obviously observed for the samples with x≥0.2, and the transition temperature gradually decreases with increasing Sr content.
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