Evidence of improved ferroelectric phase stabilization in Nd and Sc co-substituted BiFeO{sub 3}

Journal Article · Tue Oct 28 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4898805· OSTI ID:22308174

Durga Rao, T.; Asthana, Saket ^[1]

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1. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology Hyderabad, Telangana 502205 (India)

Polycrystalline BiFeO{sub 3} and Bi{sub 0.9}Nd{sub 0.1}Fe{sub 1−x}Sc{sub x}O{sub 3} (x = 0, 0.05, and 0.10) multiferroic compounds were prepared using conventional solid-state route. X-ray diffraction studies and Raman measurements indicated that the compounds were crystallized in rhombohedral structure with R3c space group. Weak ferromagnetism was induced due to the suppression of canted spin structure in the substituted compounds. Both remanent magnetization (M{sub r}) and coercive field (H{sub c}) were enhanced in Nd and Sc substituted compounds. Further, Néel temperature T{sub N} was decreased from 644 K for BiFeO{sub 3} to 550 K for Bi{sub 0.9}Nd{sub 0.1}Fe{sub 0.9}Sc{sub 0.1}O{sub 3} compound due to weakening of magnetic exchange interactions between B-site cations in the substituted compounds. Enhanced and nearly well saturated electrical polarizations were observed in Sc substituted compounds, which are attributed to the strengthening of covalent hybridization between Bi and O ions and reduction in oxygen vacancies. The remnant polarization was enhanced to 12.5 μC/cm{sup 2} in Bi{sub 0.9}Nd{sub 0.1}Fe{sub 0.9}Sc{sub 0.1}O{sub 3} compound. Impedance studies revealed that insulating character of substituted compounds is enhanced and electrical relaxations are of non-Debye type.

• OSTI ID: 22308174
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 16; Other Information: (c) 2014 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
BISMUTH COMPOUNDS
COVALENCE
EXCHANGE INTERACTIONS
FERRITES
FERROELECTRIC MATERIALS
FERROMAGNETISM
MAGNETIZATION
NEEL TEMPERATURE
NEODYMIUM ADDITIONS
OXYGEN IONS
POLARIZATION
POLYCRYSTALS
RELAXATION
SCANDIUM COMPOUNDS
SPACE GROUPS
SPIN
TEMPERATURE RANGE 0400-1000 K
TRIGONAL LATTICES
X-RAY DIFFRACTION