Minerals to Functional Materials: Characterization of Structural Phase Transitions and Raman Analysis of a Superionic Phase in Na6Co(SO4)4

Dutta, A and Swain, D and Sunil, J and Narayana, C and Guru Row, TN (2020) Minerals to Functional Materials: Characterization of Structural Phase Transitions and Raman Analysis of a Superionic Phase in Na6Co(SO4)4. In: Inorganic Chemistry, 59 (12). pp. 8424-8431.

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Abstract

In search of promising Na+ ion conductors, we have detected a superionic phase in a Vantoffite mineral, Na6Co(SO4)4, at 570 °C, thus enhancing the use of minerals to produce futuristic solid state electrolytes. Na6Co(SO4)4 crystallizes concomitantly to produce di- and tetrahydrate forms from an aqueous solution. Both the crystal forms belong to a triclinic system, space group P1. The mineral transforms to a dehydrated phase as established by in situ single crystal X-ray diffraction at 217 °C and is shown to be isostructural with its Mn analogue. Even though thermal analysis indicates a single structural phase transition at 450 °C, the features associated with in situ powder X-ray diffraction as well as in situ Raman spectroscopy signify a second phase transition ≈540 °C and the behavior of ionic conductivity leads to a superionic phase (σ ≈ 10-2 S/cm at 570 °C). These observations are significant for the development and understanding of mineral based solid electrolytes.

Item Type:	Journal Article
Publication:	Inorganic Chemistry
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Functional materials; Minerals; Single crystals; Solid electrolytes; Thermoanalysis; X ray diffraction, Crystal forms; Dihydrates; Ion conductors; Materials characterization; Na+ ions; Raman analysis; Solid-state electrolyte; Structural phase transition; Superionic phase; Transition analysis, Sodium compounds
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	06 Feb 2023 07:13
Last Modified:	06 Feb 2023 07:13
URI:	https://eprints.iisc.ac.in/id/eprint/79870

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