1. Crystal chemistry and properties of the defect phases YBa/sub 2-x/Cu/sub 3/O/sub y
- Author
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M. Majoroš, M. Herkelova, Gustav Plesch, A.I. Novikov, František Hanic, M. Kedrová, Matej Jergel, B. Svecova, V.E. Shvaikovski, and Vladimír Štrbík
- Subjects
Materials science ,Crystal chemistry ,Transition temperature ,Analytical chemistry ,Crystallographic defect ,Electronic, Optical and Magnetic Materials ,law.invention ,Thermogravimetry ,Paramagnetism ,law ,X-ray crystallography ,Electrical and Electronic Engineering ,Electron paramagnetic resonance ,Stoichiometry - Abstract
The V-A characteristics, with and without an outer magnetic field, the T/sub c/, the phase stability at high temperatures, the oxygen intercalculation capacity in different ambient atmospheres (pO/sub 2/=1 Pa, 4*10/sup 3/ Pa and 2*10/sup 4/ Pa), and the paramagnetic behavior of ceramic samples YBa/sub 2-x/Cu/sub 3/O/sub y/ were correlated with the chemical composition and the applied technology for synthesis of the defect phases. X-ray diffraction, thermogravimetry, electron paramagnetic resonance, and the four-point resistive method were used to study the structure, phase composition, and physical properties of the Ba-deficient YBa/sub 2-x/Cu/sub 3/O/sub y/ phases. Optimal superconducting properties and the lowest contamination of the system were found for the composition YBa/sub 1.95/Cu/sub 3/O/sub y/.
- Published
- 1991