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首页> 外文期刊>Crystallography reports >Defect Structure and Ionic Conductivity of As-Grown R1-ySryF3-y (R = Ce, Pr, or Nd) Crystals with High SrF2 Content
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Defect Structure and Ionic Conductivity of As-Grown R1-ySryF3-y (R = Ce, Pr, or Nd) Crystals with High SrF2 Content

机译：具有高SRF2含量的生长R1-Ysryf3-y（R = Ce，Pr或Nd）晶体的缺陷结构和离子电导率

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摘要

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 R1-ySryF3-y (R = Ce, Pr, or Nd) belong to the tysonite structural type (LaF3), which has two forms (alpha and beta). The morphotropic transition from the trigonal beta form of the crystals to the hexagonal alpha 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 alpha form of Ce0.88Sr0.12F2.88 and R0.85Sr0.15F2.85 crystals (R = Pr or Nd) is lower than that for the beta form of R0.95Sr0.05F2.95 (R = La-Nd) by 1-2 orders of magnitude. The sublattice of fluorine atoms in the alpha-form crystals is characterized by an elevated (in comparison with the beta 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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  • 来源
    《Crystallography reports》 |2017年第4期|共6页
  • 作者

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

  • 作者单位

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

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  • 正文语种 eng
  • 中图分类 晶体学;
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