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)

Journal Article · Mon Feb 10 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4865422· OSTI ID:22283152

Yuan, B.; Chen, J.; Zuo, X. Z.; Yin, L. H.; Tang, X. W.; Zhu, X. B.; Dai, J. M.; Sun, Y. P. ^[1]

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1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)

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.

• OSTI ID: 22283152
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 6 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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