Transport measurements data are presented on bismuth-rich BiFeO3 ceramic, synthesized by a solid state method. Conductivity isotherms were analyzed using Jonscher’s empirical power-law frequency dependence. Monotonically increasing frequency-exponent n(T) over 413–593 K indicates a small polaron tunnelling mechanism for the charge transport. Distinct linear regimes observed in the Arrhenius σdc vs. T−1 plot suggest that two different charge-carriers/conductivity-relaxations prevail above and below ∼490 K. Twin Arrhenius regimes of ac-conductivity also exhibit a sharp “transition” at 510 K, from the pinned-dipole/hopping-anion dynamics to the free-dipole/oscillating-ions response at higher temperatures. Furthermore, a concurrent behavior-change of the locus traced out by the charge-hopping frequency ωh [with σ(ωh) = 2σdc] also designates 510 K as delineating two different transport characteristics in the adjacent temperature regimes.
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7 November 2018
Research Article|
November 01 2018
Impedance spectroscopy of Bi-rich BiFeO3: Twin thermal-activations
Sadhan Chandra Das;
Sadhan Chandra Das
a)
1
UGC-DAE Consortium for Scientific Research
, University Campus, Khandwa Road, Indore-452001, Madhya Pradesh, India
a)Author to whom correspondence should be addressed: scdas@csr.res.in. Tel.: +91-9329846723.
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Sumant Katiyal;
Sumant Katiyal
2
School of Electronics, Devi Ahilya University
, Khandwa Road, Indore-452001, Madhya Pradesh, India
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T. Shripathi
T. Shripathi
1
UGC-DAE Consortium for Scientific Research
, University Campus, Khandwa Road, Indore-452001, Madhya Pradesh, India
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a)Author to whom correspondence should be addressed: scdas@csr.res.in. Tel.: +91-9329846723.
J. Appl. Phys. 124, 174101 (2018)
Article history
Received:
July 04 2018
Accepted:
October 14 2018
Citation
Sadhan Chandra Das, Sumant Katiyal, T. Shripathi; Impedance spectroscopy of Bi-rich BiFeO3: Twin thermal-activations. J. Appl. Phys. 7 November 2018; 124 (17): 174101. https://doi.org/10.1063/1.5047025
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