Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3 | Zendy

Shalini Kumari | Zendy; N. Ortega | Zendy; Ashok Kumar | Zendy; Shojan P. Pavunny | Zendy; Jeremiah W. Hubbard | Zendy; Carlos Rinaldi | Zendy; G. Srinivasan | Zendy; J. F. Scott | Zendy; Ram S. Katiyar | Zendy

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Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Author(s) -

Shalini Kumari,

N. Ortega,

Ashok Kumar,

Shojan P. Pavunny,

Jeremiah W. Hubbard,

Carlos Rinaldi,

G. Srinivasan,

J. F. Scott,

Ram S. Katiyar

Publication year - 2015

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4915110

Subject(s) - grain boundary , condensed matter physics , materials science , dielectric , polaron , multiferroics , curie temperature , ferroelectricity , nuclear magnetic resonance , ferromagnetism , electron , physics , microstructure , composite material , optoelectronics , quantum mechanics

We describe systematic studies on Nd and Mn co-doped BiFeO3, i.e., (Bi0.95Nd0.05)(Fe0.97Mn0.03)O3 (BNFM) polycrystalline electroceramics. Raman spectra and X-ray diffraction patterns revealed the formation of rhombohedral crystal structure at room temperature, and ruled out structural changes in BiFeO3 (BFO) after low percentage chemical substitution. Strong dielectric dispersion and a sharp anomaly around 620 K observed near the Neel temperature ( TN ∼ 643 K of BFO) support strong magneto-dielectric coupling, verified by the exothermic peak in differential thermal data. Impedance spectroscopy disclosed the appearance of grain boundary contributions in the dielectric data in the region, and their disappearance just near the Neel temperature suggests magnetically active grain boundaries. The resistive grain boundary components of the BNFM are mainly responsible for magneto-dielectric coupling. Capacitive grain boundaries are not observed in the modulus spectra and the dielectric behavior deviates from the ...

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