Influence of Oxygen Concentration and Distribution on Microstructure and Superconducting Characteristics of MgB2-Based Materials and Melt-Textured YBCO
IEEE Transactions on Applied Superconductivity（2022）
摘要
The oxygen concentration and distribution in the microstructure of MgB
2
- and YBa
2
Cu
3
O
7-δ
-based materials affect the formation of nanostructural defects and thus influence the critical current density, upper critical magnetic field and irreversibility field. For MgB
2
oxygen containing additions (Dy-O, Ti-O) in the form of nanograins occurred not to be very effective for an increase of critical current density,
j
c
. Sn-O additions to MgB
2
can provoke even a significant decrease of
j
c
due to a chemical interaction of Sn with MgB
2
. The processing pressure and temperature influence the defect density of the relevant pinning centers and the regularity of their distribution in doped and undoped MgB
2
as well as in MT-YBCO.
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关键词
Critical current density,flux pinning,microstructure,nanostructured materials,type II super- conductors
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