Simultaneous direct measurement of the electrocaloric and dielectric dynamics of ferroelectrics with microsecond temporal resolution

Fischer, Judith Victoria; Döntgen, Jago; Molin, Christian; Gebhardt, Sylvia; Hambal, Yusra; Shvartsman, Vladimir V.; Hägele, D.; Rudolph, J.

doi:10.1063/5.0143706

Cited by 3 publications

(1 citation statement)

References 58 publications

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“…This could possibly be due to deliberate engineering of homogenous functional response in these commercial samples as well as transient features in the temperature maps being obscured by lateral heat flow on timescales shorter than the minimum measurement time of our system (∼0.5 ms). To improve the chances of resolving microstructural influences on the local EC properties, ceramic samples which exhibit clear core/shell structures could be investigated and inspiration taken from the lock-in techniques and fast thermal measurements demonstrated in the recent studies by the groups of Rudolph [33] and Defay [34].…”

Section: Resultsmentioning

confidence: 99%

High resolution spatial mapping of the electrocaloric effect in a multilayer ceramic capacitor using scanning thermal microscopy

Baxter,

Kumar,

Gregg

et al. 2023

J. Phys. Energy

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Scanning Thermal Microscopy is emerging as a powerful Atomic Force Microscope based platform for mapping dynamic temperature distributions on the nanoscale. To date, however, spatial imaging of temperature changes in electrocaloric materials using this technique has been very limited. We build on the prior works of Kar-Narayan et al. (Appl. Phys. Lett. 102, 032903, 2013) and Shan et al. (Nano Energy, 67, 104203, 2020) to show that Scanning Thermal Microscopy can be used to spatially map electrocaloric temperature changes on microscopic length scales, here demonstrated in a commercially obtained multilayer ceramic capacitor. In our approach, the electrocaloric response is measured at discrete locations with point-to-point separation as small as 125 nm, allowing for reconstruction of spatial maps of heating and cooling, as well as their temporal evolution. This technique offers a means to investigate electrocaloric responses at sub-micron length scales, which cannot easily be accessed by the more commonly used infrared thermal imaging approaches.

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Section: Resultsmentioning

confidence: 99%

High resolution spatial mapping of the electrocaloric effect in a multilayer ceramic capacitor using scanning thermal microscopy

Baxter,

Kumar,

Gregg

et al. 2023

J. Phys. Energy

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Field dependence of the electrocaloric effect in BaTiO3 and Ba(Zr0.12Ti0.88)O3: High-resolution measurements around the phase transition

Fischer,

Molin,

Gebhardt

et al. 2024

Journal of Applied Physics

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The electric field dependence of the electrocaloric effect is investigated in BaTiO3 and Ba(Zr0.12Ti0.88)O3 by a direct method with sub-mK temperature resolution. The field dependence of the caloric temperature change ΔT(E) shows a pronounced change within a few Kelvin around the Curie temperature for the first-order phase transition in BaTiO3. The transition from a linear field dependence in the ferroelectric phase over a butterfly-shaped to a quadratic field dependence in the paraelectric phase is compared to predictions of Landau–Devonshire theory. The simultaneous measurement of caloric and dielectric properties further allows for the investigation of the polarization dependence ΔT(P) of the electrocaloric effect. We find clear deviations from the predicted quadratic polarization dependence for temperatures close to the Curie temperature. Ba(Zr0.12Ti0.88)O3 shows in contrast only a slow and gradual change of the field dependence over a broad temperature range as a consequence of its diffuse phase transition.

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Direct simultaneous measurement of electrocaloric effect and hysteresis loss heating in ferroelectrics

Fischer,

Hägele,

Rudolph

2024

Applied Physics Letters

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Electrocaloric effect and loss-induced self-heating are simultaneously investigated in single-crystalline relaxor 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 by a direct, high-resolution method. Transients of the total temperature change for few-cycle electric field pulses allow to distinguish and individually determine the contributions from electrocaloric effect and self-heating with millikelvin temperature and submillisecond temporal resolution. Simultaneous dielectric measurements make the comparison of observed self-heating to hysteresis losses possible, where very good agreement is found. The loss factor as a figure of merit for electrocaloric materials is directly obtained from the combined determination of caloric temperature change and losses.

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Simultaneous direct measurement of the electrocaloric and dielectric dynamics of ferroelectrics with microsecond temporal resolution

Cited by 3 publications

References 58 publications

High resolution spatial mapping of the electrocaloric effect in a multilayer ceramic capacitor using scanning thermal microscopy

High resolution spatial mapping of the electrocaloric effect in a multilayer ceramic capacitor using scanning thermal microscopy

Field dependence of the electrocaloric effect in BaTiO3 and Ba(Zr0.12Ti0.88)O3: High-resolution measurements around the phase transition

Direct simultaneous measurement of electrocaloric effect and hysteresis loss heating in ferroelectrics

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