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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/104530

    Title: Preparation and characterization of Nd2Zr2O7 nanocrystals by a polymeric citrate precursor method
    Authors: Lee, Y. H.;Sheu, H. S.;Kao, H. C. I.
    Keywords: Phase transitions;Rietveld analysis;Powder diffraction;Oxides
    Date: 2010-11-01
    Issue Date: 2016-01-06 11:01:19 (UTC+8)
    Abstract: 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.
    Relation: Materials Chemistry and Physics 124(1), pp.145-149
    DOI: 10.1016/j.matchemphys.2010.06.006
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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