A CHEMICAL ROUTE FOR THE PREPARATION OF NANOSIZED RARE EARTH PEROVSKITE-TYPE OXIDES FOR ELECTROCERAMIC APPLICATIONS |
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Authors: | Enrico Traversa Masatomi Sakamoto Yoshihiko Sadaoka |
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Affiliation: |
a Dipartimento di Scienze e Tecnologie Chimiche, Univereita' di Roma “Tor Vergata”, Roma, Italy
b Department of Materials and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata, Japan
c Department of Materials Science and Engineering, Faculty of Engineering, Ehime University, Matsuyama, Japan |
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Abstract: | This paper reviews the work performed by the authors on the preparation of LnTO3 (Ln = rare earth elements, and T = transition metals) perovskite-type oxides by the thermal decomposition at low temperatures of the corresponding heteronuclear complexes. Bimetallic complexes in the series LnFe(CN6)]·nH2O and LnCo(CN6)] nH2O, with Ln = from La through Yb, and trimetallic complexes in the series Ln1xLnnl-xCo(CN6)] nH2O and LnFeyCo1-y(CN6)] nH2O were prepared. The formation of the perovskite-type oxides by the thermal decomposition of the complexes has been studied by simultaneous thermogravimetric and differential thermal analysis (TG/DTA), x-ray fluorescence (XRF), Fourier transform infrared (FTTR) spectroscopy, x-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The composition and temperature limits of stability for the dimetallic and trimetallic perovskite-type oxides have been clarified. The major role played by the ionic radii of the Ln3+ and T3+ ions on the formation of the perovskite-type oxides has been identified. Homogeneous perovskite-type oxide powders with nanosized particles, which possess promising characteristics for their applications as functional ceramics, are easily synthesized with this method. |
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