Influence of the critical point on the electrocaloric response of relaxor ferroelectrics

Rožič, B.; Kosec, Marija; Uršič, Hana; Holc, Janez; Malič, Barbara; Zhang, Q. M.; Blinc, R.; Pirc, R.; Kutnjak, Zdravko

doi:10.1063/1.3641975

Cited by 204 publications

(91 citation statements)

References 28 publications

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“…52 Single crystals of relaxor PbMg 1/3 Nb 2/3 O 3 -0.30PbTiO 3 were also found to display a negative electrocaloric effect; 48,49 however, ceramics of the same composition do not. 53 More recently, a giant negative electrocaloric effect with a significantly enhanced ∆T E of about −5 K was revealed in antiferroelectric La-doped Pb(Zr 0.95 Ti 0.05 )O 3 thin films near room temperature. 19 A simple mechanism is proposed to understand such negative effect in which the antiferroelectric ordered state is destabilized under electric field towards a less ordered one on the way going towards the ferroelectric ordered state.…”

Section: 3mentioning

confidence: 99%

Some strategies for improving caloric responses with ferroelectrics

2016

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Many important breakthroughs and significant engineering developments have been achieved during the past two decades in the field of caloric materials. In this review, we address ferroelectrics emerging as ideal materials which permit both giant elastocaloric and/or electrocaloric responses near room temperature. We summarize recent strategies for improving caloric responses using geometrical optimization, maximizing the number of coexisting phases, combining positive and negative caloric responses, introducing extra degree of freedom like mechanical stress/pressure, and multicaloric effect driven by either single stimulus or multiple stimuli. This review highlights the promising perspective of ferroelectrics for developing next-generation solid-state refrigeration.

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Section: 3mentioning

confidence: 99%

Some strategies for improving caloric responses with ferroelectrics

2016

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“…[20][21][22] In the present paper I will also present the impact of polarization rotation associated critical phenomena on room-temperature electrocaloric response in strained epitaxial PbTiO 3 thin films.…”

Section: Introductionmentioning

confidence: 99%

Polarization rotation associated critical phenomena in epitaxial PbTiO3 thin films near room temperature

2016

AIP Advances

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Strain-driven and temperature-driven monoclinic-orthorhombic phase transition in epitaxial PbTiO3 exhibit similar behavior under electric field, i.e., polarization discontinuity is reduced at the first-order ferroelectric-ferroelectric transition whose latent heat vanishes at a critical point. Due to critical phenomena the energy barrier for polarization rotation significantly diminishes, and hence thermodynamic response functions tend to diverge in the induced monoclinic states. Phenomenological calculations show that dielectric and piezoelectric properties are highly tunable by in-plane strain and electric field, and large electromechanical response may occur in epitaxial PbTiO3 thin films at room temperature. Phenomenological calculations show that large electrocaloric responsivity can also be expected at room temperature by manipulating the phase transition.

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“…6-10 Additionally, the electrocaloric effect in relaxors seems to show maximum responsivity R ( ¼ DT/E) near the liquid-vapor type critical point. 11,12 Several studies have been laid upon the electrocaloric properties of the PMN-xPT ceramics and crystals by using both direct 4-6,11,13-18 and indirect measurements. [19][20][21] Although the potentiality of this material system has been emphasized, some main characteristics of electrocaloric effect are unknown or unclear due to limited, fragmentary, and partially conflicting results.…”

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Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

Peräntie

Tailor

Hagberg

et al. 2013

Journal of Applied Physics

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The electrocaloric effect (ECE) in the Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN-PT) solid solution system was investigated by means of detailed direct temperature measurements as a function of temperature, composition, and electric field. The (1−x)PMN-xPT ceramics of compositions 0 ≤ x ≤ 0.3 were fabricated by the columbite route. In opposite to conventional ferroelectrics, the maximum of electrocaloric effect was found to shift from the proximity of depolarization/Curie temperature to higher temperatures above a certain composition-dependent electric field strengths. Especially, the compositions with low PT content showed a broadened temperature range of electrocaloric effect. With increasing PbTiO3 concentration, the magnitude of ΔT increased, and the temperature dependence of the maximum ECE response gradually developed towards a more pronounced anomaly typical for conventional ferroelectrics. The arising high temperature electrocaloric effect in the ergodic relaxor phase was attributed to the contribution from polar nanoregions. All the compositions studied showed the highest electrocaloric activity just above the depolarization/Curie temperature close to the possible critical point, as recently predicted and observed for some compositions. The magnitude of the maximum electrocaloric temperature change was in the range of ΔT = 0.77–1.55 °C under an electric field strength of 50 kV/cm.

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Influence of the critical point on the electrocaloric response of relaxor ferroelectrics

Cited by 204 publications

References 28 publications

Some strategies for improving caloric responses with ferroelectrics

Some strategies for improving caloric responses with ferroelectrics

Polarization rotation associated critical phenomena in epitaxial PbTiO3 thin films near room temperature

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 system

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