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Assessment of MgZr4P6O24 as a Solid Electrolyte for Sensing Mg in Molten Non-Ferrous Alloys

Adamu, M and Jacob, KT and Kale, GM (2020) Assessment of MgZr4P6O24 as a Solid Electrolyte for Sensing Mg in Molten Non-Ferrous Alloys. In: Journal of the Electrochemical Society, 167 (2).

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Official URL: https://dx.doi.org/10.1149/1945-7111/ab6556


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.

Item Type: Journal Article
Publication: Journal of the Electrochemical Society
Publisher: Institute of Physics Publishing
Additional Information: The copyright of this article belongs to Institute of Physics Publishing
Keywords: Chromite; Crystallinity; Crystallite size; Electrochemical sensors; High temperature applications; Iron alloys; Pelletizing; Sintering; Sol-gel process; Sol-gels, Electrical conductivity; High-temperature electrochemical; Impedance spectroscopy; Modified sol-gel method; Reference electrodes; Structural and electrical properties; Temperature range; Uni-axial compression, Solid electrolytes
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 10 Jul 2020 10:14
Last Modified: 10 Jul 2020 10:14
URI: http://eprints.iisc.ac.in/id/eprint/65064

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