Abstract

In this study, a sol-gel process was modified and used to synthesise gel precursors of MgCe4P6O24 ceramic electrolyte. TGA-DSC profiles predicted the calcination temperature of MgCe4P6O24 dried gel precursors at 900 oC. XRD patterns show that a single phase MgCe4P6O24 ceramic electrolyte was formed after the gels were calcined at 900 oC, and there was no phase transformation after the pelletised calcined nanopowders were sintered at 1300 0C. XRD analysis revealed that the dried gel precursor powders calcined at 900 oC shows a monoclinic crystalline phase structure with an average crystallite size of 52±1 nm, which is consistent with results from the high-resolution TEM (HRTEM). Whereas the TGA-DSC profiles show a single phase MgCe4P6O24 ceramic electrolyte at 900 oC, thermodynamic stability of the sintered MgCe4P6O24 ceramic electrolyte is held at 1300 oC. Electrical properties of platinised MgCe4P6O24 ceramic electrolytes analysed using electrochemical impedance spectroscopy (EIS) exhibits an improved bulk ionic conductivity of 10-3 Scm-1 at 744 oC, which is considered suitable as an ionic conductor in fabricating solid-state Mg-sensors.

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