Title :
Influence of oxygen and boron distribution on superconducting characteristics of nanostructural Mg-B-O ceramics
Author :
Prikhna, T.A. ; Gawalek, Wolfgang ; Kozyrev, Artem ; Eisterer, Michael ; Weber, Harald W. ; Moshchil, Viktor ; Karpets, Myroslav ; Basyuk, Tetiana ; Sverdun, Vladimir ; Kovylaev, V. ; Shaternik, A. ; Chaud, X. ; Borimskiy, A. ; Habisreuther, Tobias
Author_Institution :
Institute for Superhard Materials of the National Academy of Sciences of Ukraine, Kiev, Ukraine
Abstract :
Nanostructural superconducting MgB2-based materials contain a great quantity of O, which gives grounds to assign them to Mg-B-O compounds. The quantity of O in these materials is not an obstacle for attaining high critical current density (jc=106 A/cm2 in 1 T at 20 K), upper critical magnetic fields (Bc2(0 K)= 42 T, Bc2(22 K)= 15 T) and the fields of irreversibility (Bρ(0 K)= 32.5 T, Bρ(18.5 K)= 15 T). Our recent studies have shown that by changing manufacturing conditions (temperature, pressure, adding Ti, SiC) is possible to affect oxygen and boron distribution in the structure of Mg-B-O ceramic materials and purposefully change the type of pinning, superconducting properties, thus varying their behavior in magnetic fields.
Keywords :
Boron; Critical current density; Force; Magnetic fields; Materials; Silicon carbide; Superconducting transition temperature; MgB2-based superconductors; connectivity; critical current density; pinning; upper critical field;
Conference_Titel :
Oxide Materials for Electronic Engineering (OMEE), 2012 IEEE International Conference on
Conference_Location :
Lviv, Ukraine
Print_ISBN :
978-1-4673-4491-3
DOI :
10.1109/OMEE.2012.6464841