Adamu, M orcid.org/0000-0002-5028-9370, Jacob, KT and Kale, GM orcid.org/0000-0002-3021-5905 (2020) Assessment of MgZr4P6O24 as a Solid Electrolyte for Sensing Mg in Molten Non-Ferrous Alloys. Journal of the Electrochemical Society, 167 (2). 027532. ISSN 0013-4651
Abstract
The potential solid electrolyte, MgZr4P6O24 was prepared using a modified sol-gel method. Both structural and electrical properties of the solid electrolyte were determined. DSC-TGA analysis indicated that pure dried xerogel when calcined at 900 °C converts to single phase MgZr4P6O24 nanopowder with good crystallinity. Pellets of 13 mm diameter and 3.8 mm thickness made by uniaxial compression were sintered at 1300 °C for 24 h. XRD and HR-TEM indicated that the crystalline phase is monoclinic having crystallite size of approximately 40 nm. The sintered pellets were stable in the temperature range from 1000 to 1300 °C, with minor extraneous peaks indicating traces of a coexistent second phase (Zr2P2O9) at the higher temperature. Using impedance spectroscopy, the electrical conductivity of MgZr4P6O24 was determined as 7.23 × 10–3 Scm−1 at 725 °C. MgZr4P6O24 pellet was successfully used for fabrication of a solid-state Mg-sensor for measuring Mg concentration in molten Al at 700 ± 5 °C, with biphasic powder mixture of MgCr2O4 + Cr2O3 as ceramic reference electrode in air. A linear dependence of emf on logarithm of Mg concentration was obtained. The results indicate that the transport number of Mg2+-cation in MgZr4P6O24 is 0.85 ± 0.03 at 700 °C. The solid electrolyte has likely applications in high-temperature electrochemical sensors.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited. This is an author produced version of a paper published in Journal of The Electrochemical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Feb 2020 11:39 |
Last Modified: | 30 Jun 2021 13:56 |
Status: | Published |
Publisher: | Electrochemical Society |
Identification Number: | 10.1149/1945-7111/ab6556 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157480 |