Synthesis and Ionic Conductivity of KAlSi₃O₈

Abstract:

In this study, KAlSi₃O₈ was synthesized by a solid-phase reaction at 900, 1000 and 1100 °C, using K₂CO₃, Al₂O₃ and SiO₂ as the starting materials. The powder X-ray diffraction profile of the compound thus prepared was confirmed to contain a mixture of crystalline and glass phases. In addition, a higher sintering temperature of greater than 1000 °C possibly led to the decrease in the crystalline phase. From the temperature dependence of dc conductivity, activation energies for ionic transport were estimated to be 0.79–0.84 eV. The frequency-dependence of the real part of electrical conductivity suggests that the mechanism of ionic transport in the dispersion region possibly depends on the crystallinity of KAlSi₃O₈.

• Periodical: Key Engineering Materials (Volume 698)
• Pages: 8-12
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.698.8
• Online since: July 2016
• Authors: Shinichi Furusawa*, Yohei Minami
• Keywords: Ionic Conductivity, K-Feldspar, Potassium Aluminium Silicate

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