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Title: Effect of Eu–Ni substitution on electrical and dielectric properties of Co–Sr–Y-type hexagonal ferrite

Graphical abstract: - Highlights: • Single phase nanostructured Sr{sub 2}Co{sub 2−x}Ni{sub x} Eu{sub y}Fe{sub 12−y}O{sub 22} were synthesized by the microemulsion method. • The materials show semiconducting behavior. • The high resistivity makes these materials useful for high frequency applications. • The Curie temperature decreases with the substituents. - Abstract: Single phase nanostructured Eu–Ni substituted Y-type hexaferrites with nominal composition Sr{sub 2}Co{sub 2−x}Ni{sub x} Eu{sub y}Fe{sub 12−y}O{sub 22} (x = 0.0–1, y = 0.0–0.1) were synthesized by the normal microemulsion method. X-ray diffraction (XRD) technique was employed for phase analysis and indexing of each pattern corroborates that well defined Y-type crystalline phase is formed. It is observed that DC resistivity enhanced which is accredited to room temperature resistivity differences of dopant and host ions. The hopping of electrons and jumping of holes are responsible for conduction below Curie temperature (T{sub C}), whereas above Curie temperature is due to polaron hopping. The decrease in T{sub C} may be due to the fact that Eu–Fe interactions on the B sites are weaker than Fe–Fe interaction. The dispersion in the dielectric constant ε′(f) favor the occurrence of peaks in the tan δ(f). The extraordinary values of resistivity and small dielectric loss make thesemore » materials pre-eminent contestant for high frequency applications.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [2]
  1. Department of Physics, Bahauddin Zakariya University, Multan 60800 (Pakistan)
  2. Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60800 (Pakistan)
  3. (Pakistan)
Publication Date:
OSTI Identifier:
22341843
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 49; Other Information: Copyright (c) 2013 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:
36 MATERIALS SCIENCE; DIELECTRIC MATERIALS; FERRITE; FERRITES; INTERACTIONS; IONS; MICROEMULSIONS; NANOSTRUCTURES; PEAKS; PERMITTIVITY; PHASE STUDIES; SYNTHESIS; TANTALUM NITRIDES; X-RAY DIFFRACTION