MgZr₄P₆O₂₄ conducting solid state electrolyte and its application in fabricating high temperature Mg sensors

7^th International Conference on Smart Materials and Sustainable Technologies

April 08-09, 2019 | Toronto, Canada

Mohammed Adamu and Girish Kale

University of Leeds, United Kingdom
State Polytechnic, Nigeria

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Novel Mg2+ conducting MgZr4(1-x)M4xP6O24 (x=0) multicomponent nanostructured ceramic oxide material synthesized by the sol-gel chemical process was first investigated by Ikeda et al. as a solid electrolyte which has been successfully utilized in fabricating CO2 and SO2 potentiometric gas sensors. However, this study depicts ceramic MgZr4P6O24 synthesized and characterized for the fabrication of high-temperature electrochemical Mg-based sensors for the non- ferrous alloying, refining and process industries. Simultaneous TGADSC analysis provided insight into calcination temperature of the dried gel powders which was further analyzed through HTXRD measurements; where the determination of various phase changes at different measuring temperatures was achieved. Phase identification and structural analysis on the calcined nanopowders (T�900oC) and sintered pellets (1000oC�T�1300oC) were analyzed by XRD, showing that both conditions depict high crystallinity and chemical stability. Using impedance spectroscopy measurement, the ionic conductivity of 7.23x10- 3Scm-1 at 725oC was achieved in 2016 as a relatively higher conductivity compared to those determined earlier. Electrical properties on the platinized sintered MgZr4P6O24 solid-state pellet was measured in the frequency range 100MHz- 32MHz and a temperature range 30-800oC. The ac- and dc- conductivity measurement of MgZr4P6O24 solid-state electrolyte depicts Arrhenius behavior with activation energies in the range 0.84�Ea (eV) �0.87. The characterized solidstate electrolyte, MgZr4P6O24 sintered pellet was successfully used in fabricating a solidstate Mg-based sensor using MgCr2O4+Cr2O3 biphasic powder mixture as a reference electrode. The bulk solid-state sensor was then used in measuring Mg in Molten Al at 700±5oC. The response of the Mg- sensor to changes in the concentration of Mg in molten Al at 700±5oC relates with the Nernst equation.

Biography :

E-mail: alhaji.mahmed@gmail.com