Anomalous negative electrocaloric effect in a relaxor/normal ferroelectric polymer blend with controlled nano- and meso-dipolar couplings
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Electrical Engineering and Materials Research Inst.; Pennsylvania State University
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Electrical Engineering and Materials Research Inst.
- 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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