English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52333/87441 (60%)
Visitors : 9108886      Online Users : 315
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/104527

    Title: Electrical properties of the (Y2-xLix)Ti2O7-x samples with LiO0.5 self-flux
    Authors: Wen, L.C.;Tsai, Y.I.;Lin, H.K.;Chang, S.C.;Lin, M.Y.;Chang, H.S.;Kao, H.-C.I.;Jang, L.Y.;Lee, M.C.;Lee, Y.S.
    Keywords: Pyrochlore;Titanate;Flux;Electrical property;Oxide ion conductor
    Date: 2013-12-15
    Issue Date: 2016-01-06 11:01:13 (UTC+8)
    Abstract: A series of (Y2 − xLix)Ti2O7 − x samples abbreviated as YLT-2L were prepared by the addition of 2x moles of LiO0.5 self-flux into the parent compound, where x = 0.040 to 0.110. Preparation temperatures were either 1300 or 1350 °C, depending on the amount of flux addition. However, the Y2Ti2O7 had no LiO0.5 co-existence; it was prepared at the highest temperature, 1600 °C. Relative densities of all the YLT-2L samples were larger than 97%, but for the Y2Ti2O7, it was 94.3(2)% only. By the addition of flux, preparation temperature reduced for more than 250 °C. Among all the YLT-2L samples, the one with x = 0.070 had the highest total electrical conductivity (2.90(2) × 10− 4 S·cm− 1 at 700 °C) and the lowest total activation energy (0.99(1) eV). By doping Li ion into the Y-site, oxygen vacancies were created, although YLT-2L samples had flux co-existence, electrical conductivity was still comparable to the parent compound reported by Yamaguchi et al. (1998) and Kobayashi et al. (2002). At 500, 600 and 700 °C, the ionic transference numbers (ti) found for the YLT-2L samples were 1.00(2), 0.96(2) and 0.90(3), respectively, and did not vary with the amount of substitution and the flux addition. Contribution of the electronic conductivity was due to the presence of a small amount of the Ti3 + ions in the samples investigated by the Ti K-edge XANES spectra.
    Relation: Solid State Ionics, 253 (1), pp.227-233
    DOI: 10.1016/j.ssi.2013.09.034
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

    Files in This Item:

    File Description SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback