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Electrical Conductivity of Li–Ti Ferrites
Author(s) -
Mazen S. A.,
Elfalaky A.,
Mansour S. F.
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(199706)201:2<449::aid-pssb449>3.0.co;2-b
Subject(s) - thermal conduction , conductivity , condensed matter physics , atmospheric temperature range , materials science , impurity , electrical resistivity and conductivity , activation energy , phonon , range (aeronautics) , low frequency , chemistry , thermodynamics , physics , organic chemistry , quantum mechanics , composite material , astronomy
Both, dc and ac conductivities of the Li–Ti ferrite system with chemical formula Li 0.5+0.5 x Ti x Fe 2.5—1.5 x O 4 for 0 ≤ x ≤ 0.7 were measured at room temperature and elevated temperatures up to 833 K. The ac conductivity was measured in the frequency range from 100 Hz to 100 kHz. A strange behavior was observed and two regions appear in the conductivity–temperature dependence. The low‐temperature range, region I, was attributed to impurity conduction in addition to an effective carrier–phonon interaction. A hopping conduction mechanism was considered for the conduction in region II. The hopping threshold energy corresponding to T m , the temperature at which a minimum in conductivity occurs, was determined. The hopping energy (Δw), the exponential frequency parameter ( S ) and the phonon frequency (ν p ) were estimated.