Speaker
Dr
Ioseb Metskhvarishvili
(Laboratory of Cryogenic Technique and Technologies, Ilia Vekua Sukhumi Institute of Physics and Technology, Mindeli str. 7, 0186 Tbilisi, Georgia)
Description
We are reporting the effects of the addition of Sb2O3 on the electric and magnetic properties of Y-based high temperature superconductors. Samples with composition YBa2Cu3SbxOy (x=0.00 – 2 wt.%) were prepared by the solid-state reaction method. The starting powder was mixed in a ball mill for 1 hour. The heat treatment schedule was: first dried powders at 120°C for 4 h, raised temperature at a rate of 1°C/h up to 925°C and held at this temperature for 15 h, after was quenched to room temperature and reground thoroughly in a ball mill for 5 hours. The powder again was heated at 925°C for 15 h. This process we twice repeated and finally the total time of synthesis of powders at 925°C temperature was 60 h. The resulting powders were ground and pressed into the pellets of 6 mm diameters and 2 mm thickness by a hydraulic press with about 900 MPa. These pellets were sintered in air at 925°C for 50 h. The samples were allowed to cool at the rate of 1°C/h to room temperature. The structure of the obtained materials was determined by XRD. Ac susceptibility and high harmonic response of polycrystalline superconductors un-doped and Antimony-doped samples were measured in the presence of small ac excitation field and dc magnetic field applied on them. Finally, we observed that, the presence of antimony oxide made the system more reactive and enhanced the kinetic of reaction, as well as the promotion of the high-Tc phase.
Primary author
Dr
Ioseb Metskhvarishvili
(Laboratory of Cryogenic Technique and Technologies, Ilia Vekua Sukhumi Institute of Physics and Technology, Mindeli str. 7, 0186 Tbilisi, Georgia)
Co-authors
Mr
Bezhan Bendeliani
(Laboratory of Cryogenic Technique and Technologies, Ilia Vekua Sukhumi Institute of Physics and Technology, Mindeli str. 7, 0186 Tbilisi, Georgia)
Dr
Guram Dgebuadze
(Laboratory of Cryogenic Technique and Technologies, Ilia Vekua Sukhumi Institute of Physics and Technology, Mindeli str. 7, 0186 Tbilisi, Georgia)
Dr
Magda Metskhvarishvili
(Department of Physics, Georgian Technical University, Kostava str. 77, 0175 Tbilisi, Georgia)
Dr
Tea Lobzhanidze
(Department of Chemistry, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Chavchavadze Ave. 3, 0179 Tbilisi, Georgia)
Mr
Vakhtang Gabunia
(Laboratory of Cryogenic Technique and Technologies, Ilia Vekua Sukhumi Institute of Physics and Technology, Mindeli str. 7, 0186 Tbilisi, Georgia)
