Al_<2-x>M_x(WO_4)_3(M = Y, Ga, Sc) の熱膨張・相転移挙動

概要

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In order to obtain materials with a tailored thermal expansion, in particular zero-thermal-expansion between -50〜100℃, the possibility of preparation, thermal expansion behavior and phase transition of Al_<2-x>M_x (WO_4)_3 (M:Y, Ga and Sc) have been examined. Y was not substituted for the Al site in Al_2(WO_4)_3. Al_<2-x>Ga_x (WO_4)_3 single phase could be prepared in x range as high as 0.4. The phase transition temperature involving abrupt expansion increased with an increase of Ga content, resulting in no phase transition for Al_<1.6>Ga_<0.4>(W0_4)_3 between -50〜100℃. However, zero-thermal expansion could not be obtained in Al_<2-x>Ga_x(WO_4)_3 at the temperature range. Al_<2-x>Sc_x(WO_4)_3 single phase was obtained for the whole x range. The temperature of the phase transition decreased with an increase of Sc content and the abrupt expansion due to the phase transition disappeared above -50℃ for the specimen with x larger than 0.3. The thermal expansion coefficient could be controlled with Sc content and zero-thermal-expansion was observed for the specimens with x around 0.1 and 1.5.
社団法人日本セラミックス協会の論文
2007-03-01