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Ionic conductivity of binary fluorides of potassium and rare earth elements

Abstract

The ionic conductivity s of KYF4 and K2 RF5 single crystals (R = Gd, Ho, Er) and KNdF4 and K2 RF5 ceramic samples (R = Dy, Er) has been studied in the temperature range of 340–500°C. A comparative analysis of the σ values for these objects has been performed. Binary fluorides of potassium and rare earth elements were synthesized by the hydrothermal method (temperature 480°C, pressure 100–150 MPa) in the R 2O3–KF–H2O systems. The σ values of tetraf luorides are 3 × 10–5 S/cm (KYF4 single crystal) and 3 × 10–6 S/cm (KNdF4 ceramics) at 435°C. A K2ErF5 single crystal with σ = 1.2 × 10–4 S/cm at 435°C has the maximum value of ionic conductivity among pentafluorides. The anisotropy of ionic transport was found in K2HoF5 single crystals, σc c = 2.5, where σc and σc are, respectively, the conductivities along the crystallographic c axis and in the perpendicular direction.

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Correspondence to N. I. Sorokin.

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Original Russian Text © N.I. Sorokin, 2016, published in Kristallografiya, 2016, Vol. 61, No. 1, pp. 62–64.

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Sorokin, N.I. Ionic conductivity of binary fluorides of potassium and rare earth elements. Crystallogr. Rep. 61, 55–57 (2016). https://doi.org/10.1134/S1063774515060346

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  • DOI: https://doi.org/10.1134/S1063774515060346

Keywords

  • Ionic Conductivity
  • Crystallography Report
  • Binary Fluoride
  • KYF4
  • Pentagonal Bipyra