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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/106339

    Title: Compact Li-doped Gd2Ti2O7 prepared with LiO0.5 self-flux
    Authors: L.C. Wen;H.Y. Hsieh;S.C. Chang;M.Y. Lin;Y.H. Lee;W.P. Su;H.-C.I. Kao*;H.S. Sheu;L.Y. Jang;M.C. Lee;Y.S. Lee
    Keywords: A. Oxides;C. Electron microscopy;C. XANES;C. X-ray diffraction;D. Electrical properties
    Date: 2014-02-13
    Issue Date: 2016-04-22 13:46:39 (UTC+8)
    Abstract: A series of (Gd2−xLix)Ti2O7−x with x = 0.040–0.110 was first reported. Parent compound with 2x moles of LiO0.5 self-flux was prepared at 1250 °C and abbreviated as GLT-2L. Relative density of all the samples is higher than 92%. By the addition of flux and Li ions substitution, preparation temperature is lowered for more than 300 °C. Comparing the unit cell a-axis, GLT with a formula as (Gd2−xLix)Ti2O7−x without flux addition has exactly the same as the GLT-2L with the same x. By the addition of flux, materials become more compact and grains grow bigger for the GLT-2L than the corresponding GLT samples. Electrical conductivity of a GLT-2L with x = 0.110 at 700 °C is 3 times larger than the measurements done by other research groups in the Gd2Ti2O7. In order to demonstrate the successful substitution of the Li ion into the Gd site, a series of GT samples was prepared with a formula of Gd2−xTi2O7−1.5x. With the same amount of x, every GLT samples have a longer unit cell a-axis than that of the GT. The difference is caused by the substitution of the Li ion into the Gd site. Valence of the Ti atoms of the GLT-2L samples is slightly less than 4 studied by the XANES spectroscopy.
    Relation: Materials Research Bulletin 50(2), pp.297-302
    DOI: 10.1016/j.materresbull.2013.10.050
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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