Café com Ciência - Magnetocaloric effect: Studies on ferrites and ferrite nanocomposites

Café com Ciência aborda o efeito magnetocalórico com a palestra do Dr. Thandapani da University of Concepcion do Chile. O título da palestra é "Magnetocaloric effect: Studies on ferrite and ferrite nanocaomposites" e será apresentada na quinta-feira, dia 07/06/2018, às 12:45h, no Anfiteatro II do IF/UFG.

Magnetocaloric effect: Studies on ferrites and ferrite nanocomposites

Data:  07/05 (quinta-feira)

Horário: 12:45 hs

Local: Anfiteatro II

Palestrante: Dr. T. Prabhakaran

Filiação: University of Concepcion, Chile

Magnetocaloric effect: Studies on ferrites and ferrite nanocomposites

Dr. T. Prabhakaran

Post-doctoral researcher

Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, University of Concepcion, Concepcion, Chile.

Email: prabhakarant85@gmail.com

In the current scenario the ‘global warming’ and ‘climate change’ are the two alarming terms to the survival of small species to the human lives, where the researchers are focusing on reducing the usage of fossil fuels or finding a suitable alternative to the existing conventional technology. Conventional vapor compression cooling systems uses of CFC and HCFC refrigerants have introduced serious impacts on the environment, such as depletion of ozone layer, contribution to the global warming and high levels of electric energy consumption. A rapid growth in the field of finding an environmentally friendly alternative refrigerant for the conventional vapor-compression cooling system is increased in the last two decades where the magnetic materials play a vital role. The magnetic materials undergo isothermal magnetic entropy change and/or adiabatic change of temperature under an external magnetic field and the phenomenon is known to be the magnetocaloric effect (MCE). Various magnetic materials such as rare earth, alloys, intermetallics, lanthanides, manganites, ferrites, composites, multilayers, nanostructures and nanocrystalline, etc. have been produced for refrigeration. Currently, we are working on spinel ferrite and its composite systems for the magnetic refrigeration application. To the best of our knowledge, the ferrite and exchange coupled composite synthesized through the proposed experimental procedure show an appreciable magnetic entropy change and relative cooling power compared to other spinel ferrites reported so far. But, they show either better performance at the cryogenic region or low magnetic entropy change at or close to room temperature which demand the researcher to work on fine tuning the transition temperature to ambient condition for the real-time application.

Keywords: Magnetocaloric effect, Refrigerant capacity, Spinel ferrites and exchange couple composites.

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