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Title: Magnetic and dielectric properties of Aurivillius phase Bi{sub 6}Fe{sub 2}Ti{sub 3−2x}Nb{sub x}Co{sub x}O{sub 18} (0 ≤ x ≤ 0.4)

We investigate the structural, magnetic, and dielectric properties of Bi{sub 6}Fe{sub 2}Ti{sub 3−2x}Nb{sub x}Co{sub x}O{sub 18} (0 ≤ x ≤ 0.4). The room-temperature ferromagnetism is observed in the Nb and Co co-doped samples compared with the paramagnetic behavior in Bi{sub 6}Fe{sub 2}Ti{sub 3}O{sub 18}. The ferromagnetism in Bi{sub 6}Fe{sub 2}Ti{sub 3−2x}Nb{sub x}Co{sub x}O{sub 18} can be understood in terms of spin canting of the antiferromagnetic coupling of the Fe-based and Co-based sublattices via Dzyaloshinsky-Moriya interaction. Moreover, doping Co at Ti sites can significantly enhance the ferromagnetic Curie temperature compared with the substitution of Co for Fe in the Aurivillius compounds. The dielectric loss of Bi{sub 6}Fe{sub 2}Ti{sub 3−2x}Nb{sub x}Co{sub x}O{sub 18} (0.1 ≤ x ≤ 0.4) exhibits a relaxation process. The rather large activation energy in the 0.1 ≤ x ≤ 0.3 samples implies that the relaxation process is not due to the thermal motion of oxygen vacancies inside ceramics.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ;  [2]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22283152
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; ANTIFERROMAGNETISM; BISMUTH COMPOUNDS; CERAMICS; COBALT COMPOUNDS; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; COUPLING; CURIE POINT; DIELECTRIC PROPERTIES; DOPED MATERIALS; FERROMAGNETISM; IRON COMPOUNDS; NIOBIUM COMPOUNDS; OXYGEN; PARAMAGNETISM; RELAXATION; RELAXATION LOSSES; SPIN; TEMPERATURE RANGE 0273-0400 K; TITANATES; VACANCIES