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Crystal growth and anisotropy of ionic conductivity of trifluoride DyF3
Russian version
Karimov D. N. 1, Sorokin N. I. 1
1Shubnikov Institute of Crystallography “Crystallography and Photonics”, Russian Academy of Sciences, Moscow, Russia
Email: dnkarimov@gmail.com, nsorokin1@yandex.ru
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Crystallographically oriented single crystals of DyF3, a representative of the third structural group of rare-earth trifluorides (structure β-YF3, sp. gr. Pnma, unit cell parameters a=6.4603(2), b=6.9104(1), c=4.3808(2) Angstrem), were grown for the first time by the directional crystallization technique. Temperature (386-783 K) measurements of the ionic conductivity of this crystal were carried out along and perpendicular to the crystallographic b axis. It was found that DyF3 crystals have weak anisotropy of electrical conductivity, the coefficient σ|| b/σ normal b=2.2± 0.1 and σ|| b=2.5· 10-6 S/cm (at 500 K). The relationship between the characteristics of ion transport and the crystal structure is discussed for the general family of rare earth trifluorides with the β-YF3 structure, including RF3 compounds (R=Dy, Tb, Ho), low-temperature modifications of β-RF3 (R=Er, Y) and solid solutions Gd0.3Er0.7F3, Gd0.5Y0.5F3. It is shown that for this family of orthorhombic trifluorides, with an increase in the radius of rare earth cations, the activation enthalpy of ion transfer (vacancy mechanism) decreases, which leads to an increase in ionic conductivity. Keywords: electrical conductivity, ion transport, point defects, dysprosium trifluoride, crystal growth.
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