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 shu

Effect of Strontium and Cobalt Co-doping on the Structural and Electrical Properties of PrAlO₃ Perovskite Oxides

1.
School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China

Corresponding author: XIANG Jun,
Received Date: 25 December 2012
Available Online: 31 January 2013
Fund Project: 国家自然科学基金(No.11204108) (No.11204108)江苏省高校自然科学基金(No.11KJB430006) (No.11KJB430006)江苏省普通高校研究生科研创新计划(No.CXLX11-0293) 资助项目。 (No.CXLX11-0293)

Novel Sr- and Co-codoped (Pr,Sr)(Al,Co)O_3-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 Pr_0.9Sr_0.1Al_1-yCoyO_3-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 Pr_0.9Sr_0.1Al_1-yCoyO_3-δ can be described by the small polaron hopping mechanism. For the as-prepared Pr_1-xSr_xAl_0.5Co_0.5O_3-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 Pr_1-xSr_xAl_0.5Co_0.5O_3-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.
- co-doping;PrAlO₃;electrical properties;mixed conductor;semiconductor-metal transition
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Strontium and Cobalt Co-doping on the Structural and Electrical Properties of PrAlO3 Perovskite Oxides

References

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通讯作者: 陈斌, bchen63@163.com

Effect of Strontium and Cobalt Co-doping on the Structural and Electrical Properties of PrAlO₃ Perovskite Oxides