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Title: Anomalous negative electrocaloric effect in a relaxor/normal ferroelectric polymer blend with controlled nano- and meso-dipolar couplings

In general, a dielectric material will eject (or absorb) heat when an electric field is applied and absorb (or eject) heat when the field is removed, under isothermal condition, which is known as the normal (or negative) electrocaloric (EC) effect. For some applications, it is highly desired that an EC material will absorb heat (cooling the surrounding) without subsequent heating under an electric pulse. Here, we show that such an EC material can be realized in a properly designed hybrid normal ferroelectric/relaxor ferroelectric polymer blend in which the normal ferroelectric component induces dipole ordering in the relaxor polymer in the poled state, which can be switched to a de-poled state by an external field. More importantly, the de-poled state can be maintained by the relaxor component when the de-poling field is removed. Consequently, the hybrid blend exhibits a large cooling (an isothermal entropy change ΔS = 11.5 J kg -1K -1) without the subsequent heating upon the application of an electric pulse.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ; ORCiD logo [3]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Electrical Engineering and Materials Research Inst.
  2. Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
  3. Pennsylvania State Univ., University Park, PA (United States). Dept. of Electrical Engineering and Materials Research Inst. and Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
FG02-07ER46410; W911NF-11-1-0534; DMR-1410714
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 14; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; US Army Research Office (ARO); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; polymers; ferromagnetism; wave forms; entropy; ferroelectricity; nuclear magnetic resonance; electromagnetism; dielectric materials; electrocaloric effect; thermodynamic states and processes
OSTI Identifier:
1469693
Alternate Identifier(s):
OSTI ID: 1245503