Title :
Characterization of Bulk MgB2 Synthesized by Infiltration and Growth
Author :
Bhagurkar, A.G. ; Babu, N. Hari ; Dennis, A.R. ; Durrell, J.H. ; Cardwell, D.A.
Author_Institution :
Brunel Centre for Adv. Solidification Technol., Brunel Univ., Uxbridge, UK
Abstract :
Superconducting MgB2 has been synthesized successfully by a modified infiltration and growth (IG) technique. The ambient pressure technique is relatively simple and scalable to complex shaped bulks. The extent of MgB2 phase formation has been found to be influenced strongly by the IG process time and/or temperature, and this is found to reflect in the X-ray diffraction patterns, magnetization measurements, and microhardness. Scanning electron microscopy images show a bimodal particle size distribution with 20-50 nm sized fine precipitates in the inter particle region. A critical current density of 400 kA · cm-2 was measured at 5 K.
Keywords :
X-ray diffraction; critical current density (superconductivity); magnesium compounds; microhardness; particle size; scanning electron microscopy; superconducting materials; MgB2; X-ray diffraction patterns; ambient pressure technique; bimodal particle size distribution; critical current density; magnetization measurements; microhardness; modified infiltration-and-growth technique; phase formation; scanning electron microscopy; size 20 nm to 50 nm; superconducting magnesium diboride; temperature 5 K; Atmospheric measurements; Boron; Critical current density (superconductivity); Current measurement; Particle measurements; Powders; Temperature measurement; Bulk MgB2; Characterization; Hardness; Infiltration and Growth; characterization; hardness; infiltration and growth;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2015.2399309
