high pressure synthesis
Springer Online Journal Archives 1860-2000
Electrical Engineering, Measurement and Control Technology
Abstract A series of infinite-layer compounds Nd x Sr1−x CuO2 were synthesized by high-pressure technique under different pressure, temperature, and time conditions. Crystal structure, microstructure, and superconducting properties of the samples obtained were systematically investigated as a function of the synthesis conditions. The stability of the IL phase was studied using annealing procedures in Ar- and O2-flow, as well as under oxygen pressure up to 90 bar followed by thermogravimetric, energy-dispersive X-ray analysis, and X-ray diffraction measurements. On the basis of the results obtained we suggest a decomposition mechanism for the infinite-layer phase, which is responsible for the degradation of T c , as well as a routine to produce electron-doped infinite-layer compounds with a sharp diamagnetic signal of bulk superconductivity.
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