Synthesis and characterization of bulk Nd1−xSrxNiO2 and Nd1−xSrxNiO3
| Autor: | Omar Chmaissem, E. Krivyakina, Pietro P. Lopes, Bi-Xia Wang, Yang Ren, J. W. Lynn, S. Rosenkranz, John F. Mitchell, Hong Zheng, Leighanne C. Gallington, D. Phelan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Materials science Calcium hydride Physics and Astronomy (miscellaneous) Annealing (metallurgy) Rietveld refinement Neutron diffraction Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Synchrotron law.invention chemistry.chemical_compound chemistry law 0103 physical sciences General Materials Science Crystallite 010306 general physics 0210 nano-technology Perovskite (structure) |
| Zdroj: | Physical Review Materials. 4 |
| ISSN: | 2475-9953 |
| Popis: | The recent reports of superconductivity in Nd1-x Sr x NiO2/SrTiO3 heterostructures have reinvigorated interest in potential superconductivity of low-oxidation state nickelates. Synthesis of Ni1+-containing compounds is notoriously difficult. In the current work, a combined sol-gel combustion and high-pressure annealing technique was employed to prepare polycrystalline perovskite Nd1-x Sr x NiO3 (x = 0, 0.1, and 0.2). Metal nitrates and metal acetates were used as starting materials, and the latter were found to be superior to the former in terms of safety and reactivity. The Nd1-x Sr x NiO3 compounds were subsequently reduced to Nd1-x Sr x NiO2 using calcium hydride in a sealed, evacuated quartz tube. To understand the synthesis pathway, the evolution from NdNiO3 to NdNiO2 was monitored using in situ synchrotron x-ray diffraction during the reduction process. Electrical transport properties were consistent with an insulator-metal transition occurring between x = 0 and 0.1 for Nd1-x Sr x NiO3. Superconductivity was not observed in our bulk samples of Nd1-x Sr x NiO2. Neutron diffraction experiments at 3 and 300 K were performed on Nd0.9Sr0.1NiO2, in which no magnetic Bragg reflections were observed, and the results of structural Rietveld refinement are provided. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|