Chemical Reduction of Nd1.85Ce0.15CuO4−δPowders in Supercritical Sodium Ammonia Solutions
Abstract
Nd1.85Ce0.15CuO4−δpowders 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−δpowders 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 01, 2015
- Source ID
- 10.1155/2015/873972
Entities
People
- Feng Lin
- Haiqing Zhou
- Hui Wang
- Yasmin Dias
- Yucheng Lan
Organizations
- Defense Threat Reduction Agency
- Morgan State University
- Peking University
- University of Houston