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Title: Magnetic and electrical properties of Z-type hexaferrites sintered in different atmospheres

Graphical abstract: Oxygen atmosphere played an important role in inhibiting electrons hopping between Fe{sup 2+} and Fe{sup 3+} and reducing both of magnetic and dielectric losses of Ba{sub 3}Co{sub 2}Fe{sub 24}O{sub 41}, which is favorable in view of antenna substrate applications. - Highlights: • Co{sub 2}Z-type hexaferrites were sintered in different atmospheres. • The losses of the sample sintered in O{sub 2} were reduced effectively without additive. • A 3RC equivalent circuit model was put forward in the impedance analysis. - Abstract: Co{sub 2}Z-type hexaferrites with stoichiometric composition of Ba{sub 3}Co{sub 2}Fe{sub 24}O{sub 41} were fabricated by using a conventional solid–state reaction method. The influence of sintering atmosphere, namely air, O{sub 2} and N{sub 2}, on magnetic and electrical properties of the hexaferrites was systematically investigated. This work reveals that O{sub 2} played an important role in inhibiting the formation of Fe{sup 2+} and thus reducing magnetic and dielectric losses. The Co{sub 2}Z specimen sintered at 1300 °C in O{sub 2} atmosphere showed promising magneto-dielectric properties. Specifically, the magnetic and dielectric losses were less than 0.05 and 0.005 in the frequency range of 30–300 MHz, respectively. Impedance spectra were performed to reveal the underlying mechanisms for the different electrical propertiesmore » of the Co{sub 2}Z ceramics sintered in different atmospheres.« less
Authors:
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Publication Date:
OSTI Identifier:
22475773
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 65; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ADDITIVES; ATMOSPHERES; BARIUM COMPOUNDS; CERAMICS; COBALT COMPOUNDS; CRYSTAL STRUCTURE; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; ELECTRONS; EQUIVALENT CIRCUITS; FERRITES; MAGNETIC PROPERTIES; OXIDES; OXYGEN; SINTERING; SOLIDS; SPECTRA; SPECTROSCOPY; STOICHIOMETRY; SUBSTRATES