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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.

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Volume 228, Issue 11

Issues

Analysis of disordered nonstoichiometric Ln1–xAexF3–x (Ln = Tb or Gd, and Ae = Ca or Sr) single crystals

Valentyn Vasyliev / Yuichi Michiue / Encarnación G. Víllora / Yoshitaka Matsushita / Akira Sato / Masahiro Nagao
  • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • Department of Resources and Environmental Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yoshiyuki Sugahara
  • Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Kiyoshi Shimamura
  • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2013-11-19 | DOI: https://doi.org/10.1524/zkri.2013.1666

Abstract

High quality nonstochiometric Tb- and Gdbased single crystals Tb0.81Ca0.19F2.81 (TCF), Tb0.76Sr0.24F2.76 (TSF), Gd0.85Ca0.15F2.85 (GCF), Gd0.83Sr0.17F2.83 (GSF) are analyzed in crystallographic detail by single-crystal X-ray diffraction measurements. TSF shows only main reflections, and its structure is refined to a disordered P63/mmc structural model. Additional satellite reflections observed in GSF lead to an ordered twinned P3̅

c1 structural model. The other two crystals TCF and GCF cannot be assigned uniquely to any of these space groups. Instead, their structures are interpreted as the coexistence of both space groups in separate domains.

Keywords : Tysonite; Rare-earth fluoride; Nonstoichiometric compound; Single crystal; Disordered structure

    About the article

    Published Online: 2013-11-19

    Published in Print: 2013-11-01


    Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 228, Issue 11, Pages 576–582, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.2013.1666.

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