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V P Balema

V P Balema

Ames Laboratory, US DOE, USA

Title: Mechanochemical synthesis: Novel materials for magnetic cooling applications

Biography

Biography: V P Balema

Abstract

The presentation addresses the mechanochemical approach to solid-state synthesis, which proved to be indispensable for the solvent-free preparation of a great variety of molecular, ionic and metallic solid materials. The talk specifically focuses on the solid-state synthesis of rare earth-based metal organic frameworks (MOFs), which have a potential for becoming materials of choice for low temperature magnetocaloric systems that are under development at CaloriCoolTM.. CaloriCoolTM is a newly established research consortium, which discovers, develops and deploys materials for magneto- electro- and elastocaloric cooling. It is a part of the DOE’s energy materials network (EMN) designed to accelerate innovation around the clean energy industries by addressing pressing materials challenges ranging from early development to manufacturing. In the course of our research, we showed that the mechanochemical approach can be successfully applied to the preparation of MIL-78-type metal organic frameworks. Contrary to the previous reports, the presence of a liquid (liquid assisted grinding) is not essential for the process. Thus obtained Gd-, Tb- and Dy- based MOFs showed short range magnetic order below 20 K; no long range order was observed down to 2 K. The magnetocaloric effect of Gd-based material was found to be comparable to the best known cryogenic refrigerants. Our further investigations revealed that the mechanochemical methodology can be extended onto other rare earth-based hybrid organic-inorganic materials with substantial magnetocaloric effect at cryogenic temperatures.

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