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Systematic study of the microstructures and electrical and superconducting properties of nanocarbon doped MgB2tapes
- Source :
- Superconductor Science and Technology. 20:1198-1204
- Publication Year :
- 2007
- Publisher :
- IOP Publishing, 2007.
-
Abstract
- A series of C doped and undoped MgB2 tapes sintered at 600–950 °C was fabricated. The relationships between the critical current properties, crystallinity and microstructures were systematically studied as functions of the C doping level and heating conditions. A decrease in the a-axis length due to carbon substitution was observed in the C doped samples. The full width at half maximum (FWHM) of the MgB2 (101) peak increased with increasing C doping level, suggesting that the introduction of lattice defects and/or the decrease of the grain size of MgB2 occurred on C doping. Due to the substitution of C for B, the upper critical field was improved in C doped MgB2 samples. Substantially improved critical current density, Jc, was found in all of the C doped samples. At 4.2 K, 10 T, Jc reached 2.2 × 104 A cm−2 in the 8% C doped samples.
- Subjects :
- Superconductivity
Materials science
Doping
Metals and Alloys
Analytical chemistry
chemistry.chemical_element
Nanotechnology
Condensed Matter Physics
Microstructure
Grain size
Crystallinity
Full width at half maximum
chemistry
Materials Chemistry
Ceramics and Composites
Electrical and Electronic Engineering
Critical field
Carbon
Subjects
Details
- ISSN :
- 13616668 and 09532048
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Superconductor Science and Technology
- Accession number :
- edsair.doi...........9b56cacd92074a4d8ac1f7e966a8964c