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Analysis of AC Conductivity Data of the Anion Excess Sr 1 — x Th x F 2 + 2x Solid Solution with Fluorite‐Type Structure
Author(s) -
Hairetdinov E. F.,
Uvarov N. F.,
Xu Y. J.,
Reau J. M.
Publication year - 1997
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 - 10.1002/1521-3951(199709)203:1<17::aid-pssb17>3.0.co;2-y
Subject(s) - conductivity , charge carrier , solid solution , fluorite , ion , analytical chemistry (journal) , dielectric , dipole , chemistry , fluoride , electrical resistivity and conductivity , materials science , inorganic chemistry , physics , chromatography , optoelectronics , organic chemistry , quantum mechanics
Conductivity parameters, number of charge carriers, frequency of hopping, have been determined from an analysis of ac conductivity data of the Sr 1 — x Th x F 2 + 2 x (0 ≤ x ≤ 0.225) solid solution with fluorite‐type structure. The charge carrier concentration has been estimated: (i) from the frequency dependence of conductivity, in accordance with the Almond‐West approach; (ii) from the increment of the dielectric constant due to charge carriers. Similar results have been obtained by both approaches. The fraction of charge carriers per formula unit, evaluated as a function of composition, is in good agreement with the estimations made on the basis of the clustering process model which assumes that the charge carriers at long range in Sr 1 — x Th x F 2 + 2 x are interstitial fluoride ions of F′′′ type. For x > 0.05, the results have been interpreted by the additional presence of nn and nnn dipoles, the concentration and reorientation rate parameters of which have been evaluated.