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Properties of MgB2 Fabricated by Sintering Mg and B Sandwich Structures

Published online by Cambridge University Press:  01 February 2011

Andrew Yeung  and
Dickon H. L. Ng
Andrew Yeung
Affiliation:
[email protected], The Chinese University of Hong Kong, Physics, Room 107, Science Centre North Block,, The Chinese University of Hong Kong,, Shatin, NT, Hong Kong, N/A, Hong Kong
Dickon H. L. Ng
Affiliation:
[email protected], The Chinese University of Hong Kong, Department of Physics, Room 107, Science Centre North Block,, The Chinese University of Hong Kong,, Shatin, NT, Hong Kong, N/A, China, People's Republic of
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Abstract

Magnesium diboride (MgB2) was successfully produced in a pellet with sandwich-like structure. The sample was prepared by embedding a layer of Mg powder in between layers of boron powder before they were cold-pressed and sintered in argon atmosphere at different temperatures. After sintering, the interfacial regions between the Mg and B layers were examined and hexagonal platelets were observed lying along the interfacial regions in samples sintered at temperatures above 700°C. These hexagonal platelets were confirmed as MgB2. When samples were sintered at higher temperatures, the lateral size of the platelets increased. At 700°C, the average size of the platelets was 0.5 μgm, and it increased to 1.5 μgm in sample sintered at 900°C. In addition, the critical temperature (TC) and the magnetization (M) were also changed from 35.4 K to 37.1 K and −0.7 to −1.8 emu/g, respectively.

Keywords

crystal growthMgB
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1099: Symposium II – Heterostructures, Functionalization and Nanoscale Optimization in Superconductivity , 2008 , 1099-II04-02
Copyright
Copyright © Materials Research Society 2008

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