English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 60868/93650 (65%)
造访人次 : 1149129      在线人数 : 9
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻

    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/104530

    题名: Preparation and characterization of Nd2Zr2O7 nanocrystals by a polymeric citrate precursor method
    作者: Lee, Y. H.;Sheu, H. S.;Kao, H. C. I.
    关键词: Phase transitions;Rietveld analysis;Powder diffraction;Oxides
    日期: 2010-11-01
    上传时间: 2016-01-06 11:01:19 (UTC+8)
    摘要: Nd2Zr2O7 was prepared by a polymeric citrate precursor method and then calcined at 700–1400 ◦C in
    static air. Larger nano-size particles were obtained with increasing calcination temperature. Samples have
    a defect fluorite phase if they are prepared below 1000 ◦C. However, if it is heat treated at temperature
    between 1100 and 1400 ◦C, a disordered pyrochlore phase is obtained. Unit cell a-axis dimension of
    the samples gradually increases with increasing preparation temperature. The amount of cation antisite
    and the occupancy factor of the O(3) site in the pyrochlore phase gradually decrease in the samples
    prepared at higher temperatures. In other words, the ordering process is an activated behavior. Activation
    energies of the cation and anion ordering are 0.12(1) and 0.23(2) eV, respectively, equivalent to 12(1) and
    22(2) kJ mol−1.
    關聯: Materials Chemistry and Physics 124(1), pp.145-149
    DOI: 10.1016/j.matchemphys.2010.06.006
    显示于类别:[化學工程與材料工程學系暨研究所] 期刊論文


    档案 描述 大小格式浏览次数



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