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    题名: Compact Li-doped Gd2Ti2O7 prepared with LiO0.5 self-flux
    作者: Wen, L.C.;Hsieh, H.Y.;Chang, S.C.;Lin, M.Y.;Lee, Y.H.;Su, W.P.;Kao, H.-C.I.;Sheu, H.S.;Jang, L.Y.;Lee, M.C.;Lee, Y.S.
    贡献者: 淡江大學化學學系
    关键词: A. Oxides;C. Electron microscopy;C. XANES;C. X-ray diffraction;D. Electrical properties
    日期: 2014-02-13
    上传时间: 2014-04-27 20:24:15 (UTC+8)
    出版者: Kidlington: Pergamon
    摘要: 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.
    關聯: Materials Research Bulletin 50, pp.297-302
    DOI: 10.1016/j.materresbull.2013.10.050
    显示于类别:[化學學系暨研究所] 期刊論文


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