The relationship between ionic conductivity and structural characteristics of melt-grown KR 3F10 (R = Tb, Dy, Ho, Y) single crystals
- 26 August 2022
- journal article
- research article
- Published by Walter de Gruyter GmbH in Zeitschrift für Kristallographie - Crystalline Materials
- Vol. 237 (10-12), 429-434
- https://doi.org/10.1515/zkri-2022-0032
Abstract
The temperature dependences of the ionic electrical conductivity of fluorite-type (sp. gr. , 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 KR 3F10 (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 V 1F 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.
Keywords
Funding Information
- Ministry of Higher Education and Science of the Russian Federation
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