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    Title: Effect of Li2O Addition on the Preparation of (Y2-yLiy)Ti2O7-y
    Authors: Su, Wen-ping;Lee, Yu-hsuen;Hsieh, Ching-tien;Sheu, Hwo-shuenn;Lee, Jyh-fu;Chiang, Yong-ping;Kao, H.-C. I.
    Contributors: 淡江大學化學學系
    Keywords: (Y2-yLiy)Ti2O7-y;Flux;Pyrochlore;SEM;Ti K-edge XANES
    Date: 2009-12-01
    Issue Date: 2013-07-11 11:27:09 (UTC+8)
    Publisher: 臺北市:中國化學學會
    Abstract: Anew series of (Y2-yLiy)Ti2O7-y having an ordered pyrochlore phase was prepared by a solid state reaction method with a solid solution range of 0.05 y 0.10. Unit cell parameters obtained by the Rietveld refinement method shows that the a-axis decreases linearly with increasing the amount of Li ion addition,indicating the successful incorporation of the Li ion into unit cell. The average x-fractional coordinate of the O(1) site depends on the ionic radius ratio of r(A3+)/r(Ti4+) in theA2Ti2O7 with a pyrochlore phase. The Ti K-edge XANES spectra of the (Y2-yLiy)Ti2O7-y show that the valence of the Ti ions is slightly less than 4 so that Ti is in the mixed valence state. Average particle size increases with increasing the amount of extra Li ion addition, which acts as a flux to lower the melting point of the materials.
    Relation: Journal of the Chinese Chemical Society=中國化學會會誌 56(6), pp.1112-1117
    DOI: 10.1002/jccs.200900161
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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