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Synthesis and cationic ordering structure of samarium-doped lead magnesium niobate ceramics

Authors
Journal
Materials Research Bulletin
0025-5408
Publisher
Elsevier
Publication Date
Volume
32
Issue
6
Identifiers
DOI: 10.1016/s0025-5408(97)00045-7
Keywords
  • A. Ceramics
  • A. Oxides
  • C. Electron Diffraction
  • C. X-Ray Diffraction
  • D. Crystal Structure

Abstract

Abstract The pyrochlore-free 10 mol% Sm 2O 3-doped/undoped Pb(Mg 1 3 Nb 2 3 )O 3 ceramics were fabricated and their cationic ordering structures were investigated by X-ray/electron diffraction techniques. In the X-ray diffraction patterns, only fundamental diffraction peaks were observed for the undoped Pb(Mg 1 3 Nb 2 3 )O 3, while the ( h + 1 2 k + 1 2 l + 1 2 ) superlattice reflections were also observed for the 10 mol% Sm 2O 3-doped Pb(Mg 1 3 Nb 2 3 )O 3. In the electron diffraction patterns, the ( h + 1 2 k + 1 2 l + 1 2 ) superlattice reflections as well as the fundamental diffraction spots were observed for the undoped and the 10 mol% Sm 2O 3-doped Pb(Mg 1 3 Nb 2 3 )O 3, but the intensities of the superlattice reflections were stronger for the 10 mol% Sm 2O 3-doped Pb(Mg 1 3 Nb 2 3 )O 3. It has been experimentally assured that Sm-doping enhances the 1:1 ordering of Mg 2+ and Nb 5+ ions in Pb(Mg 1 3 Nb 2 3 )O 3 .

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