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

fYear

2008

fDate

25-29 Feb. 2008

Firstpage

97

Lastpage

100

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 (T_c), the upper critical field (H_c2), and the irreversibility field (H_irr) 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 T_c, while the Hc₂ and H_irr 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICONN.2008.4639255

Filename

4639255