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The relationship between ionic conductivity and structural characteristics of melt-grown KR3F10 (R = Tb, Dy, Ho, Y) single crystals

  • Denis N. Karimov EMAIL logo , Irina I. Buchinskaya and Nikolay I. Sorokin

Abstract

The temperature dependences of the ionic electrical conductivity of fluorite-type (sp. gr. F m 3 m , Z = 8) KDy3F10 and KHo3F10 single crystals grown by the Bridgman technique have been studied by impedance spectroscopy for the first time. The correlation between the conductometric and structural characteristics of KR3F10 (R = Tb, Dy, Ho, Y) crystal family from the point of view of the observed size effect in the ionic conductivity is discussed. With decrease in the unit-cell volume V1F per fluorine atom in a series of crystals with R = Tb, Dy, Ho and Y, the activation energy Eσ of ion transfer decreases from 1.57 to 1.16 eV respectively and the fluorine-ion conductivity value increases from 3.0 × 10−5 to 4.4 × 10−4 S cm at 773 K, i.e. the nature of the conductivity change is linearly antibatic. This phenomenon can be useful for developing approaches and search strategies for new ionic conductors.


Corresponding author: Denis N. Karimov, Shubnikov Institute of Crystallography, Federal Scientific Research Centre «Crystallography and Photonics» of Russian Academy of Sciences, 59 Leninskiy Prospect, 119333, Moscow, Russia, E-mail:

Funding source: Ministry of Higher Education and Science of the Russian Federation

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This research was supported by the Ministry of Higher Education and Science of the Russian Federation within the State assignment of the Federal Scientific Research Centre «Crystallography and Photonics» of the Russian Academy of Sciences using the equipment of the Shared Research Center FSRC «Crystallography and Photonics» RAS.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-05-06
Accepted: 2022-08-10
Published Online: 2022-08-26
Published in Print: 2022-11-25

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