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Magneto-dielectric anomaly in (Bi0.95Nd0.05)(Fe0.97Mn0.03)O3 electroceramic

Published online by Cambridge University Press:  05 February 2014

Shalini Kumari ,
Nora Ortega ,
Ashok Kumar  and
Ram S. Katiyar
Shalini Kumari
Affiliation:
Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3334,USA
Nora Ortega
Affiliation:
Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3334,USA
Ashok Kumar
Affiliation:
National Physical Laboratory (CSIR), Delhi, India.
Ram S. Katiyar
Affiliation:
Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3334,USA
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Abstract

We report magneto-dielectric anomaly of the multiferroic (Bi0.95Nd0.05)(Fe0.97Mn0.03)O3 (BNFM) ceramic near Néel temperature. The ceramic pellets were synthesized by conventional solid state reaction route. X-ray diffraction patterns revealed that most of the peaks shifted slightly towards higher Bragg’s angle compared to those of pure BiFeO3 and also confirmed the formation of rhombohedral phase. It also suggests that the small chemical substitution of Nd and Mn atoms at Bi and Fe sites of BiFeO3 (BFO) perovskite respectively does not alter the crystal structure. Temperature and frequency dependent dielectric response indicate large dielectric anomaly at 620 K, slightly below the known Néel temperature of BFO. The enhancement in dielectric properties of BNFM ceramic was observed as compared to BFO due to suppression of oxygen vacancies by the doping. Temperature dependent dielectric response in conjunction with Raman and thermo-analytical data show that the BNFM sample presents significant magneto-dielectric response around Néel temperture TN ∼ 620 K.

Keywords

ferromagneticx-ray diffraction (XRD)Raman spectroscopy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1636: Symposium U – Magnetic Nanostructures and Spin-Electron-Lattice Phenomena in Functional Materials , 2014 , mrsf13-1636-u03-14
Copyright
Copyright © Materials Research Society 2014 

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