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Ionic conductivity of binary fluorides of potassium and rare earth elements

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, 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Ionic conductivity of binary fluorides of potassium and rare earth elements

Crystallography Reports , Volume 61 (1): 3 – Jan 1, 2016

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References (4)

Publisher
Springer Journals
Copyright
2016 Pleiades Publishing, Inc.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/S1063774515060346
Publisher site
See Article on Publisher Site

Abstract

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, 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.

Journal

Crystallography ReportsSpringer Journals

Published: Jan 1, 2016

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