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CAMP Seminar: Relaxor Ferroelectrics with Giant Electrocaloric Effect – Materials for Next Generation of Cooling Technology

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Q. M. Zhang, The Pennsylvania State University
When
10 January 2017 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
Contact Name
Moses Chan
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Our society is highly dependent on the reliable cooling and it is starting that the modern cooling technology is supported by the century old vapor compression cycle (VCC) refrigeration.  VCC based cooling has reached its efficiency limit which is not high and the refrigerant gases in the VCC are strong greenhouse gases (contributing 25% of the greenhouse gases). This talk will present the recent advances in developing electrocaloric materials which have promise to provide alternative cooling technology to the century old vapor compression cycle (VCC) based cooling. Electrocaloric effect (ECE), which is the temperature and/or entropy change of dielectric materials caused by the electric field induced polarization change, is attractive to realize efficient cooling devices.  Recently, we demonstrated that large ECE can be achieved in several classes of ferroelectric materials with tailored nano- and meso-structures. Experimental results on the ECE in the relaxor ferroelectric polymers and general theoretical considerations for achieving large ECE will be presented. This talk will also discuss considerations on and present recent works in using nanocomposites to further enhancing the ECE beyond the pure relaxor polymers, and in approaches to developing ferroelectric ceramics with giant ECE. The works related to developing the EC cooling devices, making use of the newly developed large ECE in ferroelectric materials and featuring high cooling power density and high efficiency, will also be presented. 

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