Aliovalent-Ion and Magnetic Field Induced Phase Transition in Multiferroic BiFe_1−xTi_xO₃ System

Author: Yadav, K.L.

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 3, March 2011 , pp. 2682-2686(5)

Publisher: American Scientific Publishers

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Abstract:

Multiferroic compounds with general formula BiFe_1−xTi_xO₃ (x = 0.1, 0.2, 0.3 and 0.35) have been synthesized by conventional solid state reaction method. The effect of Ti substitution on ferroelectric and magnetic properties is studied. From X-ray diffraction (XRD) analysis, a rhombohedral to orthorhombic phase transition for x > 0.3 was observed. From SQUID measurements, a magnetic field induced phase transition has been observed in the BiFe_1−xTi_xO₃ system for x = 0.3. An anomaly in dielectric constant and dielectric loss in the vicinity of antiferromagnetic Néel temperature (T_N and a small enhancement in magnetization have been observed. Magnetization measurements above room temperature showed no systematic variation in antiferromagnetic Néel temperatures on Ti substitution. Further it is seen that this system shows the coupling between electric and magnetic dipoles exhibiting magnetoelectric (ME) effect at room temperature and possess high dielectric constant.

Keywords: MULTIFERROIC; BISMUTH FERRITE; PHASE TRANSITION; MAGNETIZATION; NEEL TEMPERATURES; SQUID

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2011.2709

Publication date: 2011-03-01

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