Study on reaction mechanism of low temperature preparation of nanocrystalline LaCoO3-λ
来源期刊：JOURNAL OF RARE EARTHS2008年第5期
论文作者：YANG Qiuhua LI Ning SHEN Haiyun
Key words：perovskite; nanocrystalline; synthesis mechanism; rare earths;
Abstract: Perovskite-type oxide nanocrystalline LaCoO3-λ was prepared using the citrate method.The structure and morphology of the sam-pies were characterized by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM).The intermediate products were analyzed by thermal gravimetric and differential thermal analysis (TG-DTA) technology.The results showed that nanocrystaUine LaCoO3-λwith a granula of 30-50 nm had a cubic perovskite structure.The reaction mechanism of low temperature preparation was suggested as fol-lows:the metal complex was first formed by the combination of metal ion and citric acid;and then it decomposed into an aconitie acid com-plex, followed by an oxycarbonate,and finally a perovskite-type oxide.
YANG Qiuhua1，LI Ning1，SHEN Haiyun1
(1.Department of Chemistry,School of Science,Tianjin University,Tianjin 300072,China)
Abstract:Perovskite-type oxide nanocrystalline LaCoO3-λ was prepared using the citrate method.The structure and morphology of the sam-pies were characterized by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM).The intermediate products were analyzed by thermal gravimetric and differential thermal analysis (TG-DTA) technology.The results showed that nanocrystaUine LaCoO3-λwith a granula of 30-50 nm had a cubic perovskite structure.The reaction mechanism of low temperature preparation was suggested as fol-lows:the metal complex was first formed by the combination of metal ion and citric acid;and then it decomposed into an aconitie acid com-plex, followed by an oxycarbonate,and finally a perovskite-type oxide.
Key words:perovskite; nanocrystalline; synthesis mechanism; rare earths;
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