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Journal of Materials Science

, Volume 31, Issue 6, pp 1435–1443 | Cite as

A study of positional disorder in strontium barium niobate

  • M. P. Trubelja
  • E. Ryba
  • D. K. Smith
Papers

Abstract

The first systematic examination of trends in the site occupancies of strontium and barium ions in strontium barium niobate (SBN) at three compositions across the phase range is presented. X-ray powder diffraction and Rietveld structure refinement were used to obtain refined structures for SBN. Some problems were encountered in the structure refinement due to the domain structure in the material. Barium was found only at the A2 site for each composition. Ba/Sr occupancy for the A2 site varied from 91% for SBN (72-28) to 99% for SBN (50-50) in the unannealed state, while strontium occupancy of the A1 site varied from 70% to 54%. In annealed SBN (50-50), the A2 site occupancy decreased to 95%, while the A1 site occupancy increased to 62%. It is proposed that a twisting of the structure in the unannealed state decreases the sizes of the cages at the A1, A2 and C sites. After annealing, the structure becomes more regular, enlarging the A1, A2 and C sites and allowing more strontium atoms to occupy the A1 site. Cation distribution is controlled by the twisting of the octahedral framework. The overall properties of the material are modified by this distortion of the structure.

Keywords

Barium Strontium Domain Structure Structure Refinement Systematic Examination 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • M. P. Trubelja
    • 1
  • E. Ryba
    • 1
    • 2
  • D. K. Smith
    • 1
    • 3
  1. 1.Mineral Processing Program, Department of Mineral EngineeringThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Materials Science and EngineeringThe Pennsylvania State UniversityUniversity ParkUSA
  3. 3.Departments of Materials Science and Engineering and GeosciencesThe Pennsylvania State UniversityUniversity ParkUSA

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