NDLI: Optimization of Phase Formation and Superconducting Properties in MgB$_{2}$ Prepared by Phase Transformation from MgB$

Content Provider	Springer Nature Link
Author	Tan, K. L. Tan, K. Y. Lim, K. P. Shaari, A. H. Chen, S. K.
Copyright Year	2012
Abstract	In this work, polycrystalline MgB$_{4}$ was prepared, and then the presence of MgO in the powder was reduced by acid leaching. To synthesize MgB$_{2}$, the MgB$_{4}$ powder was reacted with Mg at temperatures from 650°C to 950°C for 4 h and 8 h. Using the Rietveld method, the MgB$_{2}$ phase was estimated to be in greater proportion over the sintering temperature range of 650°C to 750°C, above which it decreased rapidly, accompanied by the formation of more of the MgB$_{4}$ phase. Scanning electron microscopy showed that the samples have reduced porosity compared with those synthesized by the direct reaction of (Mg + 2B). Upon increasing the sintering temperature, the superconducting transition temperature decreased, which is attributed to lattice distortion. The results of this work demonstrate that control of heat treatment is essential to optimize the weight fraction of the MgB$_{2}$ phase and thereby increase the critical current density, J $_{c}$. The value of the magnetic J $_{c}$ (5 K, 1 T) for the sample sintered at 750°C for 4 h is estimated to be 1.00 × 10$^{5}$ A/cm$^{2}$.
Starting Page	673
Ending Page	678
Page Count	6
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	41
Issue Number	4
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2012-02-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MgB$_{4}$ MgB$_{2}$ phase weight fraction superconducting properties Solid State Physics Characterization and Evaluation of Materials Optical and Electronic Materials Electronics and Microelectronics, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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