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Dimorphism of RF3 (R = La–Nd) crystals based on the data of X-ray diffraction studies

Abstract

The ratio of two forms of tysonite in nominally pure single crystals of RF3 (R = La–Nd) obtained from melts under identical conditions (the as-grown state) is studied for the first time by X-ray diffraction. Crystals of RF3 with R = La–Nd belong to the β-LaF3 structural type (space group \(P\bar 3c1\), Z = 6) and form twins. Samples 0.2–0.4 in diameter contain inclusions of the high-temperature a form (space group P63/mmc, Z = 2). It is shown that twinning and dimorphism of the RF3 crystals (R = La–Nd) have a common structural basis.

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Correspondence to N. B. Bolotina.

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Original Russian Text © N.B. Bolotina, T.S. Chernaya, I.A. Verin, O.N. Khrykina, B.P. Sobolev, 2016, published in Kristallografiya, 2016, Vol. 61, No. 1, pp. 36–41.

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Bolotina, N.B., Chernaya, T.S., Verin, I.A. et al. Dimorphism of RF3 (R = La–Nd) crystals based on the data of X-ray diffraction studies. Crystallogr. Rep. 61, 29–34 (2016). https://doi.org/10.1134/S1063774516010041

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  • DOI: https://doi.org/10.1134/S1063774516010041

Keywords

  • Crystallography Report
  • Fluoride Anion
  • Rare Earth Element Series
  • Superstructure Reflection
  • Twin Model