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  • 标题:Chemical Reduction of Nd1.85Ce0.15CuO4−δ Powders in Supercritical Sodium Ammonia Solutions
  • 本地全文:下载
  • 作者:Yasmin Dias ; Hui Wang ; Haiqing Zhou
  • 期刊名称:Advances in Condensed Matter Physics
  • 印刷版ISSN:1687-8108
  • 电子版ISSN:1687-8124
  • 出版年度:2015
  • 卷号:2015
  • DOI:10.1155/2015/873972
  • 出版社:Hindawi Publishing Corporation
  • 摘要:Nd1.85Ce0.15CuO4−δ powders are chemically reduced in supercritical sodium ammonia solutions from room temperature to 350°C. The crystallographic structure of the reduced powders is investigated from Rietveld refinement of X-ray powder diffraction. The atomic positions are maintained constant within experimental errors while temperature factors of all atoms increase significantly after the chemical treatments, especially of Nd/Ce atoms. The ammonothermally reduced Nd1.85Ce0.15CuO4−δ powders show diamagnetic below 24 K which is contributed to the lower oxygen content and higher temperature factors of atoms in the treated compound. The ammonothermal method paves a new way to reduce oxides in supercritical solutions near room temperature.
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