Ion mobility and conductivity in the M{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} (M=K, Rb) solid solutions with fluorite structure

Ionic mobility and conductivity in the K{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} and Rb{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} (x=0.05, 0.09) solid solutions with the fluorite structure have been investigated using the methods of {sup 19}F NMR, X-ray diffraction and impedance spectroscopy. Types...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 249
Main Authors Kavun, V. Ya, Uvarov, N.F., Slobodyuk, A.B., Polyantsev, M.M., Merkulov, E.B., Ulihin, A.S., Goncharuk, V.K.
Format Journal Article
LanguageEnglish
Published United States 15.05.2017
Subjects
BISMUTH COMPOUNDS
CRYSTALS
EXPERIMENTAL DATA
FLUORIDES
FLUORINE IONS
FLUORITE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ION MOBILITY
IONIC CONDUCTIVITY
LEAD COMPOUNDS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
POTASSIUM COMPOUNDS
RUBIDIUM COMPOUNDS
SOLID ELECTROLYTES
SOLID SOLUTIONS
SOLIDS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION
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Summary:Ionic mobility and conductivity in the K{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} and Rb{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} (x=0.05, 0.09) solid solutions with the fluorite structure have been investigated using the methods of {sup 19}F NMR, X-ray diffraction and impedance spectroscopy. Types of ionic motions in the fluoride sublattice of solid solutions have been established and temperature ranges of their realization have been determined (150–450 K). Diffusion of fluoride ions is a dominating type of ionic motions in the fluoride sublattice of solid solutions under study above 350 K. Due to high ionic conductivity, above 10{sup –3} S/cm at 450 K, these solid solutions can be used as solid electrolytes in various electrochemical devices and systems. - Graphical abstract: Temperature dependence of the concentration of mobile (2, 4) and immobile (1, 3) F ions in the K{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} solid solutions. - Highlights: • Studied the ion mobility, conductivity in M{sub 0.5–x}Pb{sub x}Bi{sub 0.5}F{sub 2+x} solid solutions (M=K, Rb). • An analysis of {sup 19}F NMR spectra made it possible to identify types of ion mobility. • The main type of ion motion above 300 K in solid solutions is a diffusion of ions F{sup –}. • The ionic conductivity of the solid solutions studied more than 10{sup –3} S/cm at 450 K.
ISSN:0022-4596
1095-726X
DOI:10.1016/J.JSSC.2017.03.008