Important influence of Bi deficiency on the conducting property of Na0.5Bi0.5TiO3 perovskite oxide

Santhoshkumar, B and Rao, PL and Ramanathan, KV and Bera, AK and Pahari, B (2019) Important influence of Bi deficiency on the conducting property of Na0.5Bi0.5TiO3 perovskite oxide. In: 63rd DAE Solid State Physics Symposium 2018, DAE-SSPS 2018, 18 - 22 December 2018, Hisar, Haryana.

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Abstract

Recently it has been reported that low levels of Bi nonstoichiometry (only ±1 atomic %) in the nominal starting composition of Na0.5Bi0.5TiO3 (NBT) ceramics can lead to dramatic changes in the conduction property. Present article present the results of powder XRD, 23Na MAS NMR and impedance spectroscopy in nominal starting compositions, Na0.5Bi0.5+xTiO3+3x/2 with x = 0.0 and - 0.02. Room temperature XRD data analysis indicates both NBTs have a rhombohedral (space group R3c) structure. While, 23Na MAS NMR results demonstrate a complex local structure and significant disordering of Na coordination environment. Impedance spectroscopy reveals high levels of oxide-ion conduction in NBT. 2 at-% Bi-deficient NBT (Na0.5Bi0.48TiO2.97) exhibits higher conductivity of σ∼1.3 × 10-4 S/cm at 500 °C and activation energy, Ea = 0.85 eV. Present results therefore substantiate the A-site nonstoichiometry sensitive electrical property of NBT.

Item Type:	Conference Paper
Publication:	AIP Conference Proceedings
Publisher:	American Institute of Physics Inc.
Additional Information:	The copyright for this article belongs to American Institute of Physics Inc.
Department/Centre:	Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility) Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Dec 2022 07:44
Last Modified:	17 Dec 2022 07:44
URI:	https://eprints.iisc.ac.in/id/eprint/78487

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