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Electrical Properties of Nonconventional Bi‐Ba‐Cu‐O Glasses
Author(s) -
Miyaji Fumiaki,
Fujimine Satoshi,
Yoko Toshinobu,
Sakka Sumio
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08000.x
Subject(s) - polaron , seebeck coefficient , electrical resistivity and conductivity , condensed matter physics , materials science , adiabatic process , ion , conductivity , mineralogy , analytical chemistry (journal) , chemistry , electron , thermodynamics , physics , organic chemistry , chromatography , quantum mechanics
Electrical properties of Bi‐Ba‐Cu‐O glasses have been systematically investigated, and possible conduction mechanisms are discussed. Conductivity behavior is described by a small‐polaron hopping mechanism. log σ o , the slope of the log σ‐ W straight line, and the magnitude of the polaron bandwidth reveal that adiabatic hopping is dominant in the glasses. The Seebeck coefficient, S , of the Bi 16 BaCu 3 O y glass is positive, indicating that the glass is a p ‐type hole conductor. The positive deviation of the observed S value from the theoretical S value is explained by assuming that the only oxygens bonded to both Cu 2+ and Cu + ions mediate indirect Cu + ‐O‐Cu 2+ hopping.