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Electrical Resistivity of Magnetite and Nickel Ferrous Ferrite Above 300°K
Author(s) -
BOTROUS EL BADRAMANY N. M.,
MINA E. F.,
MERCHANT H. D.,
ARAFA S.,
POPLAWSKY R. P.
Publication year - 1979
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.1151-2916.1979.tb19032.x
Subject(s) - electrical resistivity and conductivity , ferrous , activation energy , ferrite (magnet) , analytical chemistry (journal) , materials science , dielectric , magnetite , nickel , relaxation (psychology) , ion , nuclear magnetic resonance , mineralogy , chemistry , metallurgy , electrical engineering , composite material , physics , psychology , social psychology , optoelectronics , chromatography , engineering , organic chemistry
The electrical resistivity of Fe 2+ 0.95 Fe 3+ 2.05 O 2+ 4 , Ni 2+ 0.51 Fe 2+ 0.46 Fe 1.95 , 3+ O 2− 4 , and Ni 0.89 , 2+ Fe 2+ 0.13 Fe 3+ 2.11 O 2− 4 single crystals was determined at >300°K. The dc resistivity up to 800°K shows a monotonic decrease with increased temperature, with an average activation energy of 0.065 eV independent of temperature and Fe z+ concentration. The ac resistivity, at frequencies of 540 kHz to 34 MHz up to 450°K, shows temperature and frequency dependences of the relative dielectric constant similar to that found when true dielectric relaxation occurs, with the activation energy depending slightly on frequency and ferrous ion content.