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Title: Chemical Reduction of Nd 1.85 Ce 0.15 CuO 4− δ Powders in Supercritical Sodium Ammonia Solutions

Nd 1.85 Ce 0.15 CuO 4− 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 Nd 1.85 Ce 0.15 CuO 4− 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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4]
  1. Department of Physics and Engineering Physics, Morgan State University, Baltimore, MD 21251, USA
  2. Department of Physics, University of Houston, Houston, TX 77204, USA
  3. State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
  4. Department of Physics and Engineering Physics, Morgan State University, Baltimore, MD 21251, USA, Department of Physics, University of Houston, Houston, TX 77204, USA
Publication Date:
OSTI Identifier:
1197736
Grant/Contract Number:
NA0000720; 2012CB933004
Type:
Published Article
Journal Name:
Advances in Condensed Matter Physics
Additional Journal Information:
Journal Volume: 2015; Related Information: CHORUS Timestamp: 2016-07-27 17:53:42; Journal ID: ISSN 1687-8108
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE
Country of Publication:
Egypt
Language:
English