固相反应、共沉淀前驱体热解或异核配合物热解制备钙钛矿氧化物LaCoO3。

S. Nakayama, T. Terada, S. Kakita, Shinji Imai, M. Sakamoto
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引用次数: 3

摘要

采用La2O3与CoO的混合物(La - Co - o)煅烧、共沉淀前驱体(La - Co - ox) La2 (C2O4)3·xH2O + CoC2O4·yH2O和异核配合物(La - Co - CN) La[Co(CN)6]·5H2O三种不同的制备方法合成了钙钛矿氧化物LaCoO3。采用热重分析、红外光谱、粉末x射线衍射、扫描电镜和比表面积测量等方法对所得粉体进行了表征。La-Co-O、La-Co-ox和La-Co-CN分别在1000、1200和600℃以上的温度下形成LaCoO3单相。采用低温热解法制备了纳米级LaCoO3粉体。600℃煅烧2 h后的La-Co-CN平均粒径为72 nm。
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Perovskite Oxide LaCoO3 Prepared by Solid-state Reaction, Pyrolysis of a Co-Precipitated Precursor or Pyrolysis of a Heteronuclear Complex.
The perovskite oxide LaCoO3 was synthesized by three different preparative methods i.e., the calcination of a mixture of La2O3 and CoO (La–Co–O) and pyrolysis of a co-precipitated precursor (La–Co–ox), La2 (C2O4)3 · xH2O + CoC2O4 · yH2O, and a heteronuclear complex (La–Co–CN), La[Co(CN)6] · 5H2O. The obtained powders were characterized by thermogravimetric analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and specific surface area measurements. The formation of LaCoO3 single phase is clearly recognized for La–Co–O, La–Co–ox and La–Co–CN at temperatures above 1000, 1200 and 600 °C, respectively. The nano-sized LaCoO3 powder was obtained at low temperatures by pyrolysis of La–Co–CN. The mean particle diameter of La–Co–CN calcined at 600 °C for 2 h was 72 nm.
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