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Perovskite Related Phases in the Sr5Nb4O15-SrTiO3 - Sr4Nb2O9 System

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Phase relations have been investigated within the Sr5Nb4O15 - SrTiO3-Sr4Nb2O9 region of the SrO - Nb2O5 - TiO2 system with a view to clarifying the occurrence of fully oxidised perovskite related phases. Overall phase analysis was carried out by powder X-ray diffraction and microstructures were clarified by transmission electron microscopy. There is only one main composition triangle in this area at 1350°C. The tie-line between Sr5Nb4O15 and SrTiO3 contains a homologous series of hexagonal layered perovskite phases including Sr6Nb4TiO18 and Sr7Nb4Ti2O21. The phase Sr4Nb2O9 is a non-stoichiometric phase with a disordered perovskite structure. There is some extension of this phase along the Sr4Nb2O9 - SrTiO3 tie-line, but SrTiO3 does not show a significant composition range. Samples with a composition Sr4Nb2O9, when heated at 900°C show several ordered modifications. Samples along the Sr4Nb2O9 - SrTiO3 tie-line which are annealed at 900°C contain these ordered materials together with samples showing considerable short range order which increases as the Ti content increases.

Affiliations: 1: School of Engineering, University of Cardiff, PO Box 685, Cardiff CF2 3TA, UK


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