Magnetic, dielectric properties, and scaling behaviors of Aurivillius compounds Bi{sub 6−x∕3}Fe{sub 2}Ti{sub 3−2x}(WCo){sub x}O{sub 18} (0 ≤ x ≤ 0.15)

Journal Article · Sat Mar 21 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4915089· OSTI ID:22399305

Zuo, X. Z.; Yuan, B.; Tang, X. W.; Zhang, K. J.; Zhu, X. B.; Song, W. H.; Song, D. P. ^[1]; Sun, Y. P. ^[2]

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

We investigate the structural, magnetic, dielectric properties, and scaling behaviors of Aurivillius compounds Bi{sub 6−x∕3}Fe{sub 2}Ti{sub 3−2x}(WCo){sub x}O{sub 18} (0 ≤ x ≤ 0.15). The room-temperature weak ferromagnetism is observed for the W/Co co-doped samples. The results of the dielectric constant ε{sub r}, complex impedance Z″, the dc conductivity σ{sub dc}, and hopping frequency f{sub H} manifest that the dielectric relaxation of the x = 0 sample and the doped samples in the dielectric anomaly region (450–750 K) can be ascribed to the trap-controlled ac conduction around the doubly ionized oxygen vacancies and the localized hopping process of oxygen vacancies, respectively. The scaling behaviors reveal that the dynamic process of both electrons in the x = 0 sample and oxygen vacancies in the doped samples is temperature independent. The ferroelectric Curie-temperature T{sub c} decreases slightly from 973 K to 947 K with increasing the doping level of W/Co. In addition, the dielectric loss exhibits a dielectric relaxation above 800 K with the rather large activation energies (1.95 eV ≤ E{sub a} ≤ 2.72 eV)

• OSTI ID: 22399305
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTIVATION ENERGY
BISMUTH COMPOUNDS
COBALT OXIDES
CONCENTRATION RATIO
CURIE POINT
DOPED MATERIALS
ELECTRONS
EV RANGE
FERROELECTRIC MATERIALS
FERROMAGNETISM
IMPEDANCE
IRON COMPOUNDS
OXYGEN
PERMITTIVITY
RELAXATION
RELAXATION LOSSES
TEMPERATURE RANGE 0273-0400 K
TITANIUM COMPOUNDS
TUNGSTEN COMPOUNDS
VACANCIES