Multi-caloric materials

SCHEME: INTER Mobility

CALL: 2016

DOMAIN: MS - Materials, Physics and Engineering

FIRST NAME: Emmanuel

LAST NAME: Defay

INDUSTRY PARTNERSHIP / PPP: No

INDUSTRY / PPP PARTNER:

HOST INSTITUTION: LIST

KEYWORDS: Caloric materials, electrocalorics, elastocalorics, phase transitions, ferroelectrics, relaxors

START: 2016-05-15

END: 2019-05-14

WEBSITE: https://www.list.lu/

Submitted Abstract

The aim of this project entitled “Multi-caloric materials” (MULTICALOR) is to invite Brahim Dkhil from Ecole Centrale Paris at LIST in the Ferroic Materials for Transducers group led by Emmanuel Defay for an overall stay of 12 months that will last over three years. The field of research will be caloric materials, which have the capability to experience a reversible temperature change when external stimulus as electric or magnetic or mechanical stress field is applied. This topic has experienced a renaissance since 2006 and the discovery of giant electrocaloric effect in lead zirconate titanate thin films. The current challenges of this bursting research topic lie in fundamental and engineering domains, namely increasing the material temperature change triggered by external stimuli, assessing the actual energy efficiency in thermodynamic cycles, imagining and realizing heat pumps based on caloric effects and assessing the benefit of combining several caloric effects.The motivation of this project is to specifically study materials exhibiting multi-caloric effects and the impact it has on the overall energy efficiency. Indeed, Dkhil has proposed a very interesting route for improving entropy change in caloric materials, by combining caloric effects [Liu et al.; Adv. Mat 26, 6132 (2014)] This should lead to increasing the efficiency of caloric effects in devices, which is of foremost importance for the development of future solid-state coolers. At LIST, we study electrocaloric (EC) materials and focus on energy efficiency. It is performed through the deposition of EC materials from the perovskite family by inkjet printing (Pb(Zr,Ti)O3, (Ba,Ca)(Ti,Zr)O3), characterization of caloric temperature change and fabrication of proof-of-concept heat pumps to assess efficiency. Consequently, there is an excellent complementarity between Dkhil’s knowledge and the new concepts we intend to develop. Dr B. Dkhil is one of the most renowned researchers in the field of relaxor ceramic materials, which are among the best EC materials (hi=38, 170 publications, 90 invited talks, 4300 citations). He has specialized himself in structural changes versus temperature of perovskite materials, which are at the heart of EC research. Since 2013, he strongly and successfully studied multicaloric effects with more than ten highly ranked papers. His team was the first to reveal the potential of combining several caloric effects.

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