Low-temperature synthesis of MgB2 via powder metallurgy processing
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, vol.122, no.12, 2016 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 122 Issue: 12
- Publication Date: 2016
- Doi Number: 10.1007/s00339-016-0604-8
- Journal Name: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Dokuz Eylül University Affiliated: Yes
Abstract
Ball-milled Mg/B2O3 powder blends reveal interpenetrating layers of deformed magnesium and boron oxide grains that are increasingly refined with increasing milling time. Boron oxide is reduced by Mg and MgO thus formed reacts with the remaining B2O3 to produce Mg-3(BO3)(2) during ball milling for 30 min. Both B2O3 and Mg-3(BO3)(2) react with Mg to produce MgB2 upon further ball milling. An annealing treatment can be employed when ball milling is performed for less than 1 h as thermal exposure of the ball-milled Mg/B2O3 powder blends also leads to the formation of MgB2. The above reactions take place between 500 and 700 degrees C when the Mg/B2O3 powder blend is ball milled for 30 min, and between 450 and 550 degrees C, after ball milling for 1 h. This is a very attractive route owing to processing temperatures where the volatility of Mg is no longer a problem.