Effect of boron powder purity on superconducting properties of MgB2

被引：49

作者：

Xu, Xun ^{[1
]}

Qin, M. J.

Konstantinov, K.

dos Santos, Dayse I.

Yeoh, W. K.

Kim, J. H.

Dou, S. X.

机构：

[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia

[2] Univ Estadual Paulista, BR-17015970 Sao Paulo, Brazil

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2006年 / 19卷 / 06期

关键词：

D O I：

10.1088/0953-2048/19/6/009

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of the properties of starting boron powders on the superconducting properties of MgB2 has been studied. The 92% and 96% pure powders produce lower surface reactivity and larger particle size than the 99% boron powder, as can be seen from Brunauer - Emmett - Teller (BET) and scanning electron microscopy (SEM) results, indicating that the low purity powders cannot be used to archive the same superconducting properties as those of samples made from pure 99% boron powder. However, the purity of 92% and 96% boron powders can be improved by using a simple chemical process, leading to enhanced magnetic critical current densities J(c). From x-ray diffraction (XRD) measurement, oxide impurity has been observed, which might be originated from the B2O3 phase in the boron powders. In order to get high performance MgB2, it is obviously important to control the phase composition and microstructure of amorphous boron starting powders and solid reaction conditions.

引用

页码：466 / 469

页数：4

共 12 条

[1] Enhancement of critical current density in low level Al-doped MgB2 [J].

Berenov, A ;

Serquis, A ;

Liao, XZ ;

Zhu, YT ;

Peterson, DE ;

Bugoslavsky, Y ;

Yates, KA ;

Blamire, MG ;

Cohen, LF ;

MacManus-Driscoll, JL .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2004, 17 (10) :1093-1096

[2] BEAN KIM AND EXPONENTIAL CRITICAL-STATE MODELS FOR HIGH-TC SUPERCONDUCTORS [J].

CHEN, DX ;

SANCHEZ, A ;

NOGUES, J ;

MUNOZ, JS .

PHYSICAL REVIEW B, 1990, 41 (13) :9510-9512

[3] Strong influence of boron precursor powder on the critical current density of MgB2 [J].

Chen, SK ;

Yates, KA ;

Blamire, MG ;

MacManus-Driscoll, JL .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2005, 18 (11) :1473-1477

[4] Enhancement of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SIC doping [J].

Dou, SX ;

Soltanian, S ;

Horvat, J ;

Wang, XL ;

Zhou, SH ;

Ionescu, M ;

Liu, HK ;

Munroe, P ;

Tomsic, M .

APPLIED PHYSICS LETTERS, 2002, 81 (18) :3419-3421

[5] Integration of suspended carbon nanotube arrays into electronic devices and electromechanical systems [J].

Franklin, NR ;

Wang, Q ;

Tombler, TW ;

Javey, A ;

Shim, M ;

Dai, HJ .

APPLIED PHYSICS LETTERS, 2002, 81 (05) :913-915

[6] Plasma synthesized doped B powders for MgB2 superconductors [J].

Marzik, JV ;

Suplinskas, RJ ;

Wilke, RHT ;

Canfield, PC ;

Finnemore, DK ;

Rindfleisch, M ;

Margolies, J ;

Hannahs, ST .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2005, 423 (3-4) :83-88

[7] Superconductivity at 39 K in magnesium diboride [J].

Nagamatsu, J ;

Nakagawa, N ;

Muranaka, T ;

Zenitani, Y ;

Akimitsu, J .

NATURE, 2001, 410 (6824) :63-64

[8] The improvement of in-situ powder in tube MgB2 tapes by mixing MgB2 to the starting powder of MgH2 and B [J].

Nakane, T ;

Fujii, H ;

Matsumoto, A ;

Kitaguchi, H ;

Kumakura, H .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2005, 426 :1238-1243

[9] Significant enhancement of critical current density and flux pinning in MgB2 with nano-SiC, Si, and C doping [J].

Wang, XL ;

Soltanian, S ;

James, M ;

Qin, MJ ;

Horvat, J ;

Yao, QW ;

Liu, HK ;

Dou, SX .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2004, 408 :63-67

[10]

Yavas M, 2005, J OPTOELECTRON ADV M, V7, P407

← 1 2 →