期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 13, 期 39, 页码 17775-17784出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp21562k
关键词
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资金
- NSFC [91022018, 21025104, 20831004]
- National Basic Research Program of China [2011CBA00501, 2011CB935904]
- FJPYT [2009HZ0004-1]
- FJIRSM [SZD08002-3, SZD09003-1, 2010KL002]
A series of Pr1-xCaxCoO3 samples were prepared using a novel molten salt reaction that is convenient to obtain single phases avoiding aggregates compared to conventional solid state reactions. The formation reaction was monitored by X-ray diffraction combined with thermal analysis, and all samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and alternating current impedance. It is demonstrated that all Pr1-xCaxCoO3 samples crystallized in a pure orthorhombic perovskite structure. By increasing the doping level, the symmetry of the orthorhombic structure was enhanced, and is followed by an increase in the population of Co3+ in the intermediate spin state. All samples exhibited typical semiconducting behavior, showing conductivities highly dependent on the Ca2+ doping. The conduction for x = 0 shows a simple thermal activated process, which changed into a Mott's variable range hopping mechanism for x > 0. By increasing the Ca2+ doping level, the relevant activation energy is decreased, while the density of the localized electronic state is increased.
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