Effects of Mg 2+ interstitial ion on the properties of Mg 0.5+x/2 Si 2-x Al x (PO 4 ) 3 ceramic electrolytes

Halim, Z.A. and Adnan, S.B.R.S. and Salleh, F.M. and Mohamed, N.S. (2017) Effects of Mg 2+ interstitial ion on the properties of Mg 0.5+x/2 Si 2-x Al x (PO 4 ) 3 ceramic electrolytes. Journal of Magnesium and Alloys, 5 (4). pp. 439-447. ISSN 2213-9567, DOI https://doi.org/10.1016/j.jma.2017.09.005.

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Official URL: http://dx.doi.org/10.1016/j.jma.2017.09.005

Abstract

Nasicon type, Mg0.5+x/2Si2-xAlx(PO4)3 was synthesized using citric acid assisted sol-gel method. The X-ray diffraction was applied to investigate the effect of extra Mg2+ interstitial ion on the phase, unit cell parameters and structure of the samples. The Mg0.625Si1.75Al0.25(PO4)3 sample exhibited highest bulk conductivity value of 1.54 × 10−4 S cm−1 at ambient temperature. The frequency dependence of the σac of these ceramic electrolytes follows the universal power law variation, σac (ω) = σo + Aωα. The conductivity parameters such as hopping frequencies, charge carrier concentration and mobile ion concentration proved that the increase in conductivity with x was due to the existence of Mg2+ interstitial ions. The experiment results also revealed that the dielectric constant and dielectric loss decreased with frequency. The Mg0.625Si1.75Al0.25(PO4)3 was found to be electrochemically stable up to 2.51 V at ambient temperature.

Item Type: Article
Funders: University of Malaya and Ministry of Education: Fundamental Research Grant Scheme (project no: FP006-2013B), University of Malaya Research Grant (project no: RP013A-13AFR), and Postgraduate Research Grant (project no: PG032- 2015A)
Uncontrolled Keywords: Ceramic; Electrolyte; Mg electrolyte; Interstitial ion; Nasicon
Subjects: Q Science > Q Science (General)
Divisions: Centre for Foundation Studies in Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Aug 2018 03:07
Last Modified: 08 Aug 2018 03:07
URI: http://eprints.um.edu.my/id/eprint/18986

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