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Influence of PbO and Ta 2 O 5 on Some Physical Properties of MgCuZn Ferrites
Author(s) -
Rezlescu N.,
Sachelarie L.,
Rezlescu L.,
Popa P.D.
Publication year - 2001
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200102)36:2<157::aid-crat157>3.0.co;2-9
Subject(s) - curie temperature , electrical resistivity and conductivity , materials science , grain boundary , dopant , saturation (graph theory) , doping , permeability (electromagnetism) , condensed matter physics , mineralogy , analytical chemistry (journal) , ferromagnetism , microstructure , chemistry , composite material , chromatography , electrical engineering , engineering , biochemistry , membrane , physics , mathematics , optoelectronics , combinatorics
Two series of MgCuZn ferrites are prepared by addition of Ta 5+ and Pb 2+ ions, separately. The variations of the sintered density, initial permeability, saturation magnetization, Curie temperature and electrical resistivity with the dopant concentration have been studied. The sintered density was found to increase when PbO content is 0.6 wt% or larger. Samples doped with PbO exhibit an appreciable higher resistivity compared to Ta‐doped and undoped samples as a result of the insulating layers on the grain boundaries. The temperature dependence of the electrical resistivity shows a change in slope in the neighbourhood of Curie temperature for all samples and this has been attributed to the influence of the magnetic ordering on the conduction mechanism. Also PbO addition improves the temperature dependence of the initial permeability. The origin of the beneficial effect of PbO compared to Ta 2 O 5 is believed to be attributed to the melting of PbO and formation of liquid phase at grain boundaries.