Ionic conductivity of binary fluorides of potassium and rare earth elements

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• 作者：N. I. Sorokin
• 刊名：Crystallography Reports
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：61
• 期：1
• 页码：55-57
• 全文大小：132 KB
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• 作者单位：N. I. Sorokin (1)
  
  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Crystallography
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-689X

文摘

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, σ_∥c /σ_⊥c = 2.5, where σ_∥c and σ_⊥c are, respectively, the conductivities along the crystallographic c axis and in the perpendicular direction. Original Russian Text © N.I. Sorokin, 2016, published in Kristallografiya, 2016, Vol. 61, No. 1, pp. 62–64.