Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics | Zendy

Florian Le Goupil | Zendy; Neil McN. Alford | Zendy

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Upper limit of the electrocaloric peak in lead-free ferroelectric relaxor ceramics

Author(s) -

Florian Le Goupil,

Neil McN. Alford

Publication year - 2016

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4950790

Subject(s) - electrocaloric effect , materials science , phase boundary , ceramic , ferroelectric ceramics , permittivity , dielectric , ferroelectricity , condensed matter physics , phase (matter) , relaxor ferroelectric , atmospheric temperature range , analytical chemistry (journal) , thermodynamics , composite material , optoelectronics , physics , chemistry , chromatography , quantum mechanics

The electrocaloric effect (ECE) of two compositions (x = 0.06 and 0.07) of (1 − x)(Na0.5Bi0.5)TiO3-xKNbO3 in the vicinity of the morphotropic phase boundary is studied by direct measurements. ΔTmax = 1.5 K is measured at 125 °C under 70 kV/cm for NBT-6KN while ΔTmax = 0.8 K is measured at 75 °C under 55 kV/cm for NBT-7KN. We show that the “shoulder,” TS, in the dielectric permittivity, marks the upper limit of the ECE peak under high applied electric fields. These results imply that the range of temperature with high ECE can be quickly identified for a given composition, which will significantly speed up the process of materials selection for ECE cooling

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