Title :
Crystal chemistry and properties of the defect phases YBa2-x Cu3Oy
Author :
Plesch, G. ; Hanic, F. ; Jergel, M. ; Strbik, V. ; Majoros, Milan ; Kedrova, M. ; Svecova, B. ; Shvaikovski, V.E. ; Novikov, A.I. ; Herkelova, M.
Author_Institution :
Slovak Acad. of Sci., Bratislava, Czechoslovakia
fDate :
3/1/1991 12:00:00 AM
Abstract :
The V-A characteristics, with and without an outer magnetic field, the Tc, the phase stability at high temperatures, the oxygen intercalculation capacity in different ambient atmospheres (pO2=1 Pa, 4×103 Pa and 2×104 Pa), and the paramagnetic behavior of ceramic samples YBa2-x Cu3Oy 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 YBa2-xCu3Oy phases. Optimal superconducting properties and the lowest contamination of the system were found for the composition YBa1.95Cu3O y
Keywords :
X-ray diffraction examination of materials; barium compounds; ceramics; crystal chemistry; crystal defects; electrical conductivity of crystalline semiconductors and insulators; high-temperature superconductors; paramagnetic resonance; stoichiometry; superconducting transition temperature; thermal analysis; yttrium compounds; Ba-deficient YBa2-xCu3Oy phases; V-A characteristics; X-ray diffraction; YBa1.95Cu3Oy; YBa2-xCu3Oy; ambient atmospheres; ceramic samples; chemical composition; contamination; critical temperature; crystal chemistry; defect phases; electron paramagnetic resonance; four-point resistive method; high temperature superconductors; high temperatures; magnetic field; oxygen intercalculation capacity; paramagnetic behavior; phase composition; phase stability; physical properties; structure; thermogravimetry; Atmosphere; Ceramics; Chemical technology; Chemistry; Electrons; Magnetic fields; Paramagnetic materials; Stability; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
