Transport properties of fluorite-type solid solutions in the KF–BiF3 and PbF2–МF−BiF3 systems (M=K, Cs) studied by 19F NMR and conductivity measurements

Autor:	A.S. Ulihin, Arseny B. Slobodyuk, R. M. Yaroshenko, V. Ya. Kavun, E. B. Merkulov, V. K. Goncharuk, Nikolai F. Uvarov
Rok vydání:	2012
Předmět:	Chemistry Analytical chemistry Ionic bonding General Chemistry Nuclear magnetic resonance spectroscopy Fluorine-19 NMR Atmospheric temperature range Conductivity Condensed Matter Physics chemistry.chemical_compound Ionic conductivity General Materials Science Fluoride Solid solution
Zdroj:	Solid State Ionics. 225:645-648
ISSN:	0167-2738
DOI:	10.1016/j.ssi.2012.04.028
Popis:	Transport properties of fluorite-type x KF−(100 − x )BiF 3 , 50PbF 2 −(50 − y )BiF 3 − y KF and 66PbF 2 −17BiF 3 −17CsF solid solutions (30 ≤ x ≤ 45; y = 20, 25 mol%) were studied by 19 F NMR spectroscopy and conductivity measurements. The observed transformations of NMR spectra in the range 150–450 K are caused by continuous change in the character of ionic mobility in the fluoride sublattice depending on the temperature, namely from ion vibrations in the rigid lattice through local motions to translational diffusion of fluoride ions. The characteristic temperature of fluoride subsystem transition from motionless state to dynamical one is determined by the sample composition. The 19 F NMR data agree qualitatively with the results of conductivity measurements. It was found that diffuse phase transition proceeds in some KF–BiF 3 solid solutions in the temperature range of 400–450 K. Samples with x = 40 and y = 20 have the highest ionic conductivity about 10 − 2 S/cm at 500 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5ccd022883c98d24eaaf36e09a2d3e5f https://doi.org/10.1016/j.ssi.2012.04.028 Zobrazit plný text záznamu Full Text from ScienceDirect