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Defect structure and ionic conductivity of as-grown R 1–y Sr y F3–y (R = Ce, Pr, or Nd) crystals with high SrF2 content

  • Structure of Inorganic Compounds
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Abstract

The structure of defect nonstoichiometric phases of Ce0.88Sr0.12F2.88, Pr0.85Sr0.15F2.85, and Nd0.85Sr0.15F2.85 single crystals has been investigated by X-ray diffraction at room temperature. Crystals R 1–ySryF3–y (R = Ce, Pr, or Nd) belong to the tysonite structural type (LaF3), which has two forms (α and β). The morphotropic transition from the trigonal β form of the crystals to the hexagonal α form is confirmed, which was previously found for the first time when analyzing the nonstoichiometric phase of La1–ySryF3–y with a SrF2 content above 10 mol % (y ≥ 0.1). Temperature dependences of fluorine-ion conductivity are obtained. It is established that the conductivity of the α form of Ce0.88Sr0.12F2.88 and R0.85Sr0.15F2.85 crystals (R = Pr or Nd) is lower than that for the β form of R0.95Sr0.05F2.95 (R = La–Nd) by 1–2 orders of magnitude. The sublattice of fluorine atoms in the α-form crystals is characterized by an elevated (in comparison with the β form) content of vacancies and more uniform structural and dynamic properties, which leads to a decrease in the mean diffusion mobility of fluorine ions and an increase in the ion-transport activation enthalpy.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”, Russian Academy of Sciences, Moscow, 119333, Russia

    O. N. Khrykina, N. I. Sorokin, I. A. Verin, N. B. Bolotina & B. P. Sobolev

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  1. O. N. Khrykina
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  2. N. I. Sorokin
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  3. I. A. Verin
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  4. N. B. Bolotina
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  5. B. P. Sobolev
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Correspondence to N. B. Bolotina.

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Original Russian Text © O.N. Khrykina, N.I. Sorokin, I.A. Verin, N.B. Bolotina, B.P. Sobolev, 2017, published in Kristallografiya, 2017, Vol. 62, No. 4, pp. 559–565.

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Khrykina, O.N., Sorokin, N.I., Verin, I.A. et al. Defect structure and ionic conductivity of as-grown R 1–y Sr y F3–y (R = Ce, Pr, or Nd) crystals with high SrF2 content. Crystallogr. Rep. 62, 545–550 (2017). https://doi.org/10.1134/S1063774517040083

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  • DOI: https://doi.org/10.1134/S1063774517040083

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