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NMR investigations unveil phase composition property correlations in Sr0.55Na0.45SiO2.775 fast ion conductor

Rao, P Lokeswara and Pahari, Bholanath and Shivanand, M and Shet, Tukaram and Ramanathan, K V (2017) NMR investigations unveil phase composition property correlations in Sr0.55Na0.45SiO2.775 fast ion conductor. In: SOLID STATE NUCLEAR MAGNETIC RESONANCE, 84 (SI). pp. 204-209.

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Official URL: http://doi.org/10.1016/j.ssnmr.2017.05.001

Abstract

This paper reports results of Na-23 and Si-29 solid-state NMR investigations carried out on sodium strontium silicate ion conductor, Sr0.55Na0.45Si2.775 and presents the first experimental evidence to show that different synthesis conditions induce multiple devitrified phases. Along with 1-dimensional NMR, Na-23 MQMAS spectra have been used to identify the phases corresponding to polymorphs of Na2Si2O5, in addition to the crystalline SrSiO3 and the glass/amorphous Na2Si2O5 phases. The surprising observation of about an order of magnitude higher ionic conductivity achieved in devitrified samples is attributed to the growth of the crystalline (delta-Na2Si2O5 phase within the amorphous Na2Si2O5 phase domains, identified using NMR. Together with XRD and conductivity measurement data, the study leads to the identification of the chemical phase composition and an understanding of the composition-property-structure correlation in this material. Present findings, while do not show any evidence of Na doping in the SrSiO3 phase confirming earlier reports, explain the large discrepancy in the conductivity reported in the literature. (C) 2017 Elsevier Inc. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ACADEMIC PRESS INC ELSEVIER SCIENCE, 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Department/Centre: Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Depositing User: Id for Latest eprints
Date Deposited: 30 Sep 2017 09:19
Last Modified: 30 Sep 2017 09:19
URI: http://eprints.iisc.ac.in/id/eprint/57950

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