Perovskite-related phases in the Sr{sub 4}Nb{sub 4}O{sub 14}-Sr{sub 5}Nb{sub 4}O{sub 15}-SrTiO{sub 3} system
Journal Article
·
· Journal of Solid State Chemistry
- Univ. of Cardiff (United Kingdom). School of Engineering
Phase relations have been investigated within the Sr{sub 4}Nb{sub 4}O{sub 14}-Sr{sub 5}Nb{sub 4}O{sub 15}-SrTiO{sub 3} region of the SrO-Nb{sub 2}O{sub 5}-TiO{sub 2} system with a view to clarifying the occurrence of perovskite-related phases. Most samples were prepared from oxide or carbonate powders heated in air at 1,350 C but some samples were also prepared by argon arc melting. Overall phase analysis was carried out by powder X-ray diffraction. Two phase lines contain a homologous series of layered perovskite phases. These are the Sr{sub n}(Nb,Ti){sub n}O{sub 3n+2} (4 {le} n {le} 7) series on the Sr{sub 4}Nb{sub 4}O{sub 14}-SrTiO{sub 3} line and Sr{sub n}(Nb,Ti){sub n{minus}1}O{sub 3n} (5 {le} n {le} 7) on the Sr{sub 5}Nb{sub 4}O{sub 15}-SrTiO{sub 3} line. The microstructures in these homologous series were clarified by transmission electron microscopy. This revealed both ordered and disordered intergrowths of the perovskite homologues and allowed the defect microstructure of SrTiO{sub 3} in contact with the layered perovskites to be determined.
- OSTI ID:
- 642182
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 135; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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