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Ordering in lead magnesium niobate solid solutions

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Abstract

Nonstoichiometric ordering of magnesium and niobium cations in undoped and lanthanum-doped lead magnesium niobate solid solutions has been investigated by means of high-resolution transmission electron microscopy and computer image simulation. High-resolution lattice images were obtained using different objective apertures for various microscope imaging conditions. Computer image simulations were performed for a wide range of sample thicknesses, defocusing conditions, local Mg/Nb ratios, and long-range order parameters. The simulated images demonstrated that the lattice images of the ordered region are predominantly dependent on the long-range order parameter. By a comparison of the experimental and simulated images, a range of values of the long-range order parameter 0.2⩽S<0.8 was obtained for the ordered regions. It was also shown that the ordered structure has a (NH4)3FeF6 structure, which consists of alternating magnesium- and niobium-preferred sublattices along the 〈111〉 directions.

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Authors and Affiliations

  1. Department of Materials and Nuclear Engineering, University of Maryland, 20742, College Park, MD, USA

    K. Park, L. Salamanca-Riba & M. Wuttig

  2. Materials Research Laboratory, and Department of Materials Science and Engineering, University of Illinois, 61801, Urbana, IL, USA

    D. Viehland

Authors
  1. K. Park
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  2. L. Salamanca-Riba
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  3. M. Wuttig
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  4. D. Viehland
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Park, K., Salamanca-Riba, L., Wuttig, M. et al. Ordering in lead magnesium niobate solid solutions. J Mater Sci 29, 1284–1289 (1994). https://doi.org/10.1007/BF00975076

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  • DOI: https://doi.org/10.1007/BF00975076

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