Electron microscopy and structural studies of Nd1/3NbO3
WEILL, François
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Ressources en Microscopie Electronique et Microanalyse
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Ressources en Microscopie Electronique et Microanalyse
WEILL, François
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Ressources en Microscopie Electronique et Microanalyse
< Réduire
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Ressources en Microscopie Electronique et Microanalyse
Langue
en
Article de revue
Ce document a été publié dans
Comptes Rendus. Chimie. 2008, vol. 11, n° 6-7, p. 734-740
Académie des sciences (Paris)
Résumé en anglais
The crystal structure of the deficient perovskite Nd1/3NbO3 has been determined at room temperature, using electron microscopy observations and X-ray powder diffraction data. Electron diffraction study and HRTEM images ...Lire la suite >
The crystal structure of the deficient perovskite Nd1/3NbO3 has been determined at room temperature, using electron microscopy observations and X-ray powder diffraction data. Electron diffraction study and HRTEM images evidence the doubling of a and b parameters and confirm one of the c-parameter with respect to perovskite unit cell. The structure refinement has been carried out using the orthorhombic Cmmm space group. The Nd3+ cations occupy randomly and alternatively the (00l) planes and Nb5+ cations distorted octahedral sites. This structure is characterized by the presence of empty Nd3+ sites in every second layer and the tilting of the octahedral sites around the b-axis. In addition, electron diffraction patterns exhibit weak additional diffuse reflections, which supposes some ordering of the Nd vacancies.< Réduire
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