A Crystal-Physical Model of Electrotransfer in the Superionic Conductor Pb{sub 1–} {sub x}Sc{sub x}F{sub 2+} {sub x} (x = 0.1)

Journal Article · Sun Apr 15 00:00:00 EDT 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S1063783418040327· OSTI ID:22771240

Sorokin, N. I., E-mail: [e-mail] ^[1]

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1. Russian Academy of Sciences, Shubnikov Institute of Crystallography “Crystallography and Photonics” (Russian Federation)

The frequency (ν = 10{sup –1}–107 Hz) dependences of electrical conductivity σ(ν) of single crystals of superionic conductor Pb{sub 0.9}Sc{sub 0.1}F{sub 2.1} (10 mol % ScF{sub 3}) with fluorite type structure (CaF{sub 2}) in the temperature range 153–410 K have been investigated. The static bulk conductivity σ{sub dc} =1.5 × 10{sup –4} S/cm and average hopping frequency ν{sub h} = 1.5 × 10{sup 7} Hz of charge carriers (mobile ions F{sup −}) at room temperature (293 K) have been defined from the σ{sub dc}(ν) experimental curves. Enthalpies of thermoactivated processes of ionic conductivity σ{sub dc}(T) (ΔH{sub σ} = 0.393 ± 0.005 eV) and dielectric relaxation ν{sub h}(T) (ΔH{sub h} = 0.37 ± 0.03 eV) coincide within their errors. A crystal-physical model of fluorine-ion transport in a Pb{sub 0.9}Sc{sub 0.1}F{sub 2.1} crystal lattice has been proposed. The characteristic parameters of charge carriers have been calculated: concentration n{sub mob} = 2.0 × 10{sup 21} cm{sup −3}, the distance of the hopping d ≈ 0.5 nm and mobility μ{sub mob} = 4.5 × 10{sup −7} cm{sup 2}/s V (293 K).

• OSTI ID: 22771240
• Journal Information: Physics of the Solid State, Vol. 60, Issue 4; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCIUM FLUORIDES
CHARGE CARRIERS
CONCENTRATION RATIO
CRYSTAL LATTICES
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ENTHALPY
FLUORINE COMPOUNDS
FLUORINE IONS
FLUORITE
FREQUENCY DEPENDENCE
IONIC CONDUCTIVITY
LEAD COMPOUNDS
MOBILITY
MONOCRYSTALS
RELAXATION
SCANDIUM COMPOUNDS
SIMULATION
SUPERCONDUCTORS