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An X-ray diffraction and DTA study of the ferroelectric transition in barium sodium niobate

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Abstract

The structural behaviour of barium sodium niobate has been studied in the region of the ferroelectric Curie point (∼ 580°C) by means of high-temperature X-ray diffraction and DTA. No significant changes in the diffraction pattern are observed until temperatures in the vicinity ofT c are reached; the patterns are then consistent with the structure retaining tetragonal symmetry through the transition but assuming a significantly lowerc/a ratio. The results are compared with thermal expansion measurements made on single crystals. The thermal effect associated with the transition has been used to determine the order of the transition and the results suggest that the reaction is first order.

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Authors and Affiliations

  1. Department of Physical Metallurgy and Science of Materials, University of Birmingham, UK

    J. S. Abell & I. R. Harris

  2. Royal Radar Establishment, Malvern, Worcs, UK

    B. Cockayne

Authors
  1. J. S. Abell
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  2. I. R. Harris
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  3. B. Cockayne
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Abell, J.S., Harris, I.R. & Cockayne, B. An X-ray diffraction and DTA study of the ferroelectric transition in barium sodium niobate. J Mater Sci 8, 667–672 (1973). https://doi.org/10.1007/BF00561222

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  • DOI: https://doi.org/10.1007/BF00561222

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