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Influence of strontium on the cubic to ordered hexagonal phase transformation in barium magnesium niobate
Phase Transitions Volume 23 Issue 6 December 2000 pp 495-498
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https://www.ias.ac.in/article/fulltext/boms/023/06/0495-0498 -
Keywords
Oxides ;X-ray diffraction ;ordering ;dielectric materials -
Abstract
Oxides of the type Ba3-xSrxMgNb2O9 were synthesized by the solid state route. Thex = 0 composition (Ba3MgNb2O9) was found to crystallize in a disordered (cubic) perovskite structure when sintered at 1000C. For higher Sr doping (x ≥ 0.5), there was clearly the presence of an ordered hexagonal phase indicated by the growth of superstructure reflections in the powder X-ray diffraction patterns. In all the compositions there was the presence of a minor amount of Ba5-xSrxNb4O15 phase which increased with Sr substitution up tox = 1 and then it remained nearly constant at about 5%. Samples sintered at 1300C showed the hexagonally ordered phase for the entire range of composition (0 ≤x ≤ 3). The degree of ordering being considerably greater than in the 1000C heated samples as evidenced by several superstructure reflections
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Author Affiliations
- Department of Chemistry, Indian Institute of Technology, New Delhi - 110 016, India
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Dates
- Published
- December 2000
- Manuscript received
- 5 June 2000
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Bulletin of Materials Science
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