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Dielectric Properties of the Fast‐Ion Conductor Na 3 Sc 2 P 3 O 12
Author(s) -
Delbecq C. J.,
Marshall S. A.,
Susman S.
Publication year - 1981
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.2221060240
Subject(s) - dielectric , dissipation factor , ion , atmospheric temperature range , relaxation (psychology) , materials science , conductor , crystallite , analytical chemistry (journal) , phase (matter) , range (aeronautics) , thermal conduction , dielectric loss , activation energy , chemistry , thermodynamics , physics , psychology , social psychology , optoelectronics , organic chemistry , chromatography , metallurgy , composite material
Dielectric properties of granular crystallites of the fast‐ion conductor Na 3 Sc 2 P 3 O 12 are measured in the frequency range 0.05 to 26 MHz and the temperature range − 70 to + 125 °C. Plots of the loss tangent, at fixed frequency, vs. temperature show a very sharp change in tan δ accompanying a structural phase change at about 63 °C. These plots show two loss maxima in the low temperature phase which indicate the occurrence of two relaxation processes with activation energies of 0.49 and 0.77 eV. These relaxation processes are probably distinct from the process of fast‐ion conduction which occurs at temperatures above the phase change at 63 °C. The existence of the structural phase change is substantiated by heat capacity measurements.