Significant enhancement of flux pinning in MgB2/Fe/Cu superconducting wires fabricated by in situ powder-in-tube method
| Autor: | Guo Yan, E. Mossang, A. Sulpice, Pingxiang Zhang, Yong Zhao, Yong Feng, Lian Zhou |
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| Rok vydání: | 2005 |
| Předmět: |
Superconductivity
Flux pinning Argon Materials science Condensed matter physics Doping Energy Engineering and Power Technology Sintering chemistry.chemical_element Condensed Matter Physics Microstructure Copper Grain size Electronic Optical and Magnetic Materials chemistry Electrical and Electronic Engineering |
| Zdroj: | Physica C: Superconductivity and its Applications. :1216-1219 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2005.02.103 |
| Popis: | Dense MgB 2 /Fe/Cu wires with and without Zr doping were successfully prepared through the in situ powder-in-tube (PIT) method. MgB 2 /Fe/Cu wires were sintered at 650-850 °C for 2 h in argon. Critical current density (J c ) of the wires was measured at different temperatures in the magnetic field up to 8 T by standard four probe method. As shown by inductive measurements, the heat treatment temperature has an obvious influence on flux pinning of MgB 2 wire. Also it is found that the flux pinning in MgB 2 wire can be remarkably improved by Zr doping. The microstructure observation for MgB 2 wires shows that MgB 2 /Fe/Cu wire with Zr doping has better grain connectivity and higher density than other samples. The mechanism leading to high transport critical current densities of MgB 2 /Fe/Cu wires based on MgB 2 grain size is discussed. The results indicate that the J c can be further improved to meet the requirement for applications by optimizing the process conditions. |
| Databáze: | OpenAIRE |
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