Nonstoichiometric BiFe{sub 0.9}Ti{sub 0.05}O{sub 3} multiferroic ceramics with ultrahigh electrical resistivity

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3506526· OSTI ID:21476612

Yanhong, Gu; Wanping, Chen ^[1]; Yu, Wang; Feng, Chen; Chan, Helen Lai Wah ^[2]

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1. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072 (China)
2. Department of Applied Physics and Materials Research Centre, Hong Kong Polytechnic University (Hong Kong)

BiFeO{sub 3}, BiFe{sub 0.9}Ti{sub 0.1}O{sub 3}, and BiFe{sub 0.9}Ti{sub 0.05}O{sub 3} ceramics of relatively high perovskite phase content were prepared for a comparison study. While both BiFe{sub 0.9}Ti{sub 0.1}O{sub 3} and BiFe{sub 0.9}Ti{sub 0.05}O{sub 3} exhibit similarly improved weak ferromagnetism over BiFeO{sub 3}, there exists a major difference in the x-ray diffraction patterns of BiFe{sub 0.9}Ti{sub 0.1}O{sub 3} and BiFe{sub 0.9}Ti{sub 0.05}O{sub 3}, and the leakage current of BiFe{sub 0.9}Ti{sub 0.05}O{sub 3} is decreased by five orders of magnitude from that of BiFe{sub 0.9}Ti{sub 0.1}O{sub 3}. With an ultrahigh electrical resistivity, over 1x10{sup 14} {Omega} cm, BiFe{sub 0.9}Ti{sub 0.05}O{sub 3} ceramic displays an especially low dielectric loss, 0.015 at 100 Hz, a remanent polarization P{sub r} of 0.23 {mu}C/cm{sup 2} and a remanent magnetization M{sub r} of 0.13 emu/g at room temperature. It is proposed that the Fe-deficiency in BiFe{sub 0.9}Ti{sub 0.05}O{sub 3} decreases the amount of Fe{sup 2+} and leads to the ultrahigh electrical resistivity. Nonstoichiometric compositions should receive more attention for developing high quality BiFeO{sub 3} multiferroic materials.

• OSTI ID: 21476612
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 108; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
CERAMICS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
CURRENTS
DIELECTRIC MATERIALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ENERGY LOSSES
EVALUATION
FERROELECTRIC MATERIALS
FERROMAGNETIC MATERIALS
FERROMAGNETISM
IONS
IRON COMPOUNDS
IRON IONS
IRON OXIDES
LEAKAGE CURRENT
LOSSES
MAGNETIC MATERIALS
MAGNETISM
MAGNETIZATION
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLARIZATION
RELAXATION LOSSES
SCATTERING
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION