The mechanism of accelerated phase formation of MgB{sub 2} by Cu-doping during low-temperature sintering

Journal Article · Thu Mar 05 04:00:00 EST 2009 · Materials Research Bulletin

OSTI ID:21199697

Zongqing, Ma ^[1]; Qingzhi, Shi; Qian, Zhao; Zhiming, Gao ^[1]

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1. College of Materials Science and Engineering, Tianjin University, Tianjin 300072 (China)

Thermal analysis, phase identification and microstructure observation were adopted to explore the accelerating sintering effect of Cu-doping on the low-temperature formation of MgB{sub 2} below Mg melting. It is found that the Cu-doping sintering of MgB{sub 2} bulk followed an activated sintering mechanism and thus obviously promoted the reaction between Mg and B forming bulk MgB{sub 2}. Accordingly, dense MgB{sub 2} bulks with excellent T{sub c} and J{sub c} were successfully synthesized by the Cu-doping sintering at 575 deg. C for only 5 h. Further, a sintering model was proposed to illuminate the Cu-doping activated sintering mechanism. It is found that during the Cu-doping activated sintering process, the local Mg-Cu liquid generates firstly and then segregates to the interface between Mg and B particles, which can wet Mg particles and provide a rapid transport for the diffusion of neighboring Mg atoms into B particles resulting in the accelerated formation of MgB{sub 2} phase.

• OSTI ID: 21199697
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 3 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
COPPER
INTERFACES
MAGNESIUM BORIDES
MELTING
MICROSTRUCTURE
SINTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMAL ANALYSIS