Temperature dependent conductivity mechanisms observed in Pr2NiTiO6

Rudra, Moumin and Halder, Saswata and Saha, Sujoy and Dutta, Alo and Sinha, TP (2019) Temperature dependent conductivity mechanisms observed in Pr2NiTiO6. In: MATERIALS CHEMISTRY AND PHYSICS, 230 . pp. 277-286.

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Abstract

The crossover between two different conduction mechanisms (variable range and small polaron hoppings) is probed utilizing a conjunction of thermally varying conductivity and impedance in polycrystalline Pr2NiTiO6 (PNT). A combination of X-ray diffraction (XRD) and Raman spectroscopic investigations authenticates the lower symmetric monoclinic structure for PNT. The conductivity, impedance and relaxation spectra highlight the combined contributions of the electrodes, grain-boundaries and grain microstructures to the carrier dynamics in PNT. The relaxation mechanism has a non-ideal nature with distribution of relaxation times as observed from the dielectric and impedance spectroscopic data. The de resistivity investigation points towards a transition in the conduction mechanism showing a gradual crossover at temperature 490 K, from small polaron hopping to Mott's variable range hopping due to reduced activation energy.

Item Type:	Journal Article
Publication:	MATERIALS CHEMISTRY AND PHYSICS
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	copyright for this article belongs to ELSEVIER SCIENCE SA
Keywords:	Powders: solid state reaction; Spectroscopy; Electrical conductivity; Perovskites
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	10 Jun 2020 09:53
Last Modified:	10 Jun 2020 09:53
URI:	http://eprints.iisc.ac.in/id/eprint/62870

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