Title :
Effect of addition of TiO2/SiO2 nanoparticles on Hc2 and Hirr in MgB2 bulks
Author :
Zhang, Yun ; Soltanian, Saeid ; Zhao, Yue ; Zhou, Sihai ; ShiXue Dou
Author_Institution :
Inst. for Supercond. & Electron. Mater., Univ. of Wollongong, Wollongong, NSW
Abstract :
In this paper, MgB2 bulks were prepared with doped TiO2 nanoparticles surface-modified by 5-10% SiO2. Quantitative X-ray diffraction (XRD) analysis was performed to obtain the weight fraction of impurities using the Rietveld method. The effects of addition of TiO2/SiO2 nanoparticles on the critical temperature (Tc), the upper critical field (Hc2), and the irreversibility field (Hirr) as a function of doping rates at 750degC are reported. It has been found that the addition of TiO2/SiO2 nanoparticles resulted in small depressions in Tc, while the Hc2 and Hirr performances were improved due to TiO2/SiO2 nanoparticle doping.
Keywords :
X-ray diffraction; magnesium compounds; nanoparticles; silicon compounds; superconducting critical field; superconducting transition temperature; titanium compounds; type II superconductors; MgB2 bulks; MgB2-TiO2-SiO2; Rietveld method; X-ray diffraction; XRD; critical temperature; impurities weight fraction; irreversibility field; nanoparticles; temperature 750 degC; upper critical field; Doping; Flux pinning; Land surface temperature; Magnesium compounds; Magnetic fields; Nanoparticles; Powders; Superconducting materials; X-ray diffraction; X-ray scattering; TiO2/SiO2; doping; irreversibility field; magnesium diboride; upper critical field;
Conference_Titel :
Nanoscience and Nanotechnology, 2008. ICONN 2008. International Conference on
Conference_Location :
Melbourne, Vic.
Print_ISBN :
978-1-4244-1503-8
Electronic_ISBN :
978-1-4244-1504-5
DOI :
10.1109/ICONN.2008.4639255
