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Lattice dynamics and ionic conductivity of PbF 2 :6%LiF superionic crystals
Author(s) -
Kosacki I.,
Hibner K.,
Litvinchuk A. P.,
Valakh M. Ya.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221340207
Subject(s) - ionic conductivity , raman spectroscopy , raman scattering , phonon , conductivity , activation energy , atmospheric temperature range , materials science , fast ion conductor , excited state , ionic bonding , electrical resistivity and conductivity , condensed matter physics , ion , chemistry , atomic physics , thermodynamics , optics , physics , electrolyte , organic chemistry , electrode , quantum mechanics
Abstract Temperature studies of lattice dynamics and ionic conductivity, within the temperature range of 100 to 700 K, are performed for PbF 2 and PbF 2 :6% LiF superionic crystals. The doped crystals exhibit a decreased activation energy of the conductivity. A decrease, by about 70 degrees, in the temperature at which the ionic conductivity changes and Raman spectra anomalies occur is observed. It is found that at temperatures significantly lower than that of the superionic state transition, the Raman line form is determined by processes of phonon scattering at thermally excited defects.