• Influence of strontium on the cubic to ordered hexagonal phase transformation in barium magnesium niobate

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    • 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

    • Author Affiliations


      M Thirumal1 A K Ganguli1

      1. Department of Chemistry, Indian Institute of Technology, New Delhi - 110 016, India
    • Dates

  • Bulletin of Materials Science | News

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