Mechanochemical Synthesis of Proton Conductive M3H(SO4)2 (M = Na, K, Rb) Crystals
T. Tezuka, Y. Yamashita, A. Hayashi, K. Tadanaga and M. Tatsumisago
Department of Applied Chemistry, Graduate School of Engineering,
Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan)
E-mail: t-tezuka@chem.osakafu-u.ac.jp
Pages: 237-241
Abstract
M3H(SO4)2 (M = Na, K, Rb) crystals, which are known to undergo superprotonic phase transition in the case of M = K and Rb, were prepared via mechanochemical process from equimolar M2SO4 and MHSO4. The phase transitions of M3H(SO4)2 prepared by mechanical milling using a high energy ball mill apparatus were confirmed from DTA-TG and conductivity measurements, although the phase transition temperatures were slightly lower than that of M3H(SO4)2 prepared via solution process. The Rb3H(SO4)2 prepared by mechanical milling showed reproducible ionic conductivity of 1×10-3 S/cm at 230 oC under dry N2 atmosphere.
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