Synthesis and Ionic Conductivity of MAlSi3O8 (M = Li, Na, K)

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MAlSi3O8 (M = Li, Na, K) was synthesized by solid-phase reaction at 1000 °C using M2CO3 (M = Li, Na, K), Al2O3, and SiO2 as the starting materials, and its ionic conduction was studied in the temperature range 475–800 K. It was confirmed from powder X-ray diffraction profiles that the crystalline phases of the prepared MAlSi3O8 were the same as those of orthoclase. Moreover, the ionic conductivity of NaAlSi3O8 was about 10 times higher than that of LiAlSi3O8 and KAlSi3O8. The activation energies for ionic conduction were estimated to be in the range of 0.70–0.77 eV, with NaAlSi3O8 exhibiting the lowest activation energy. The result suggests that the magnitude of the activation energy cannot be determined only from the ionic radius.

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Edited by:

Osamu Hanaizumi

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9-14

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S. I. Furusawa and Y. Minami, "Synthesis and Ionic Conductivity of MAlSi3O8 (M = Li, Na, K)", Key Engineering Materials, Vol. 790, pp. 9-14, 2018

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November 2018

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