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Thermal evolution of the microstructure of nanosized LaFeO3 powders from the thermal decomposition of a heteronuclear complex, La[Fe(CN)6] · 5H2O

Published online by Cambridge University Press:  31 January 2011

Enrico Traversa ,
Patrizia Nunziante ,
Masatomi Sakamoto ,
Yoshihiko Sadaoka ,
Maria Cristina Carotta  and
Giuliano Martinelli
Enrico Traversa
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche, Universita’ di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
Patrizia Nunziante
Affiliation:
Dipartimento di Scienze e Tecnologie Chimiche, Universita’ di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
Masatomi Sakamoto
Affiliation:
Department of Materials and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata 990, Japan
Yoshihiko Sadaoka
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Ehime University, Matsuyama 790–77, Japan
Maria Cristina Carotta
Affiliation:
INFM, Dipartimento di Fisica, Universita’ di Ferrara, Via Paradiso 12, 44100 Ferrara, Italy
Giuliano Martinelli
Affiliation:
INFM, Dipartimento di Fisica, Universita’ di Ferrara, Via Paradiso 12, 44100 Ferrara, Italy
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Abstract

The thermal decomposition of a heteronuclear complex, La[Fe(CN)6] · 5H2O, leads to the preparation of nanosized single-phase perovskite-type LaFeO3 powders. The microstructural evolution of LaFeO3 with the temperature has been studied by x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The product of the decomposition at 500 °C consists of nanoporous grains which have the morphology of the complex, but diffracting as a monocrystal of LaFeO3. At the higher temperatures, the nanosized particles start to separate from each other, still keeping the shape of the complex grains and forming soft agglomerates. The formation of LaFeO3 from the complex at low temperatures is facilitated by the formation of an orthorhombic transition phase.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1335 - 1344
Copyright
Copyright © Materials Research Society 1998

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