Sol–gel preparation and characterization of non-substituted and Sr-substituted gadolinium cobaltates

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• 作者：S. Cizauskaite ; S. Johnsen ; J.-E. Jø ; rgensen ; A. Kareiva
• 关键词：Sol&#x2013 ; gel synthesis ; Perovskites ; Gadolinium cobaltates ; Strontium substitution
• 刊名：Materials Chemistry and Physics
• 出版年：2011
• 出版时间：15 February 2011
• 年：2011
• 卷：125
• 期：3
• 页码：469-473
• 全文大小：1171 K

文摘

An aqueous sol–gel chemistry approach for the preparation of Sr-substituted perovskite gadolinium cobaltates Gd_1−xSr_xCoO_3−δ (x = 0.0, 0.25, 0.5 and 0.75) has been applied. The metal ions, generated by dissolving starting materials in diluted acetic acid were complexed by EDTA to obtain the precursors for non-substituted and Sr-substituted GdCoO₃. However, only two single-phase cobaltate samples with x = 0.0 and 0.25 have been obtained by the suggested sol–gel method. The influences of synthesis temperature and the amount of substituent on the phase purity of Gd_1−xSr_xCoO_3−δ were investigated. The evolution of the gels during heating, composition and micro-structural features in the polycrystalline samples was studied by thermal analysis (TG/DSC), infrared spectroscopy (IR), powder X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM).