Origin of Constant Loss in Ionic Conductors
Author(s) -
C. León,
A. Rivera,
A. Várez,
J. Sanz,
J. Santamarı́a,
K. L. Ngai
Publication year - 2001
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.86.1279
Subject(s) - omega , ionic bonding , condensed matter physics , electrical conductor , ionic conductivity , constant (computer programming) , conductivity , physics , crossover , ion , materials science , electrical resistivity and conductivity , low frequency , nuclear magnetic resonance , quantum mechanics , electrode , astronomy , artificial intelligence , computer science , electrolyte , programming language
We have analyzed the constant loss contribution to the ac conductivity in the frequency range 10 Hz-1 MHz and temperatures down to 8 K, for two Li ionic conductors, one crystalline (Li(0.18)La(0.61)TiO(3)) and the other glassy (61SiO(2);35Li(2)O.3Al(2)O3.P(2)O(5)). As temperature is increased a crossover is observed from a nearly constant loss to a fractional power law frequency dependence of the ac conductivity. At any fixed frequency omega, this crossover occurs at a temperature T such that omega approximately nu(0)exp(-E(m)/k(B)T), where nu(0) is the attempt frequency and E(m) is identified with the barrier for Li+ ions to leave their wells.
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