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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4944776· OSTI ID:1469693
 [1];  [2];  [3];  [2];  [4]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Electrical Engineering and Materials Research Inst.; Pennsylvania State University
  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.
  4. Pennsylvania State Univ., University Park, PA (United States). Dept. of Electrical Engineering and Materials Research Inst. and Dept. of Materials Science and Engineering
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.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-07ER46410
OSTI ID:
1469693
Alternate ID(s):
OSTI ID: 1245503
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 108; ISSN APPLAB; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Correlation Between Electrocaloric Response and Polarization Behavior: Slim-Like and Square-Like Hysteresis Loop journal April 2018
Stress-induced reversible and irreversible ferroelectric domain switching journal April 2018
Towards electrocaloric heat pump—A relaxor ferroelectric polymer exhibiting large electrocaloric response at low electric field journal September 2018
Tailoring the Electrocaloric Effect by Internal Bias Fields and Field Protocols journal August 2018
Ultrafast Electric Field Pulse Control of Giant Temperature Change in Ferroelectrics journal January 2018
Unusual Response of Thin LiTaO3 Films to Intense Microwave Pulses journal October 2019
Tailoring the electrocaloric effect by internal bias fields and field protocols text January 2018