Direct electrocaloric measurements of a multilayer capacitor using scanning thermal microscopy and infra-red imaging

Kar‐Narayan, Sohini; Crossley, Sam; Moya, Xavier; Kovacova, Veronika; Abergel, J.; Bontempi, Alexia; Baier, N.; Defaÿ, E.; Mathur, N. D.

doi:10.1063/1.4788924

Cited by 78 publications

(83 citation statements)

References 16 publications

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“…C The discovery one decade ago of giant electrocaloric (EC) effects near ferroelectric phase transitions in ceramic thin films, 1 and then in thicker films of polymers, 2 triggered intense research into ferroelectric materials for environmentally friendly EC cooling. [3][4][5][6] Although there have been significant advances in materials developments, [7][8][9] measuring techniques, [10][11][12][13][14][15][16] and heat-pump prototypes, [17][18][19][20][21] the commercial application of EC materials remains elusive. The main obstacle is that EC performance is limited by breakdown field, while another major obstacle is that electric-fieldinduced strain produces mechanical fatigue and ultimately failure.…”

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confidence: 99%

Inverse barocaloric effects in ferroelectric BaTiO3 ceramics

et al. 2016

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We use calorimetry to identify pressure-driven isothermal entropy changes in ceramic samples of the prototypical ferroelectric BaTiO3. Near the structural phase transitions at ∼400 K (cubic-tetragonal) and ∼280 K (tetragonal-orthorhombic), the inverse barocaloric response differs in sign and magnitude from the corresponding conventional electrocaloric response. The differences in sign arise due to the decrease in unit-cell volume on heating through the transitions, whereas the differences in magnitude arise due to the large volumetric thermal expansion on either side of the transitions.

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confidence: 99%

Inverse barocaloric effects in ferroelectric BaTiO3 ceramics

et al. 2016

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“…[36][37][38][39] In particular, the electrocaloric properties of BTO thin films have been intensively investigated. 12,18,19,26,[40][41][42][43][44][45][46][47] Interestingly, it was reported that applying a uniaxial compressive stress could enhance and widen the electrocaloric response considerably in ultrathin BTO films due to tuning of the depolarization field. 26 It is also reported that the electrocaloric peak under tensile stresses moves towards higher temperatures with its magnitude slightly enhanced in BTO single crystals.…”

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Influence of epitaxial strain on elastocaloric effect in ferroelectric thin films

Liu

Wei

Lou

et al. 2015

Applied Physics Letters

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“…In the case of bulk materials, the traditional approach to measuring this quantity is to measure either the change in temperature using thermometry [18] or the heat flux using calorimetry. [19,20] Similar to the PEE, the last few decades have seen growing interest in investigating the ECE in thin films and, in turn, a need for more advanced measurement approaches has developed.…”

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Direct Measurement of Pyroelectric and Electrocaloric Effects in Thin Films

et al. 2017

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Understanding of polarization-heat interactions in pyroelectric and electrocaloric thin-film materials requires that the electrothermal response is reliably characterized. While most work, particularly in electrocalorics, has relied on indirect measurement protocols, here we report a direct technique for measuring both pyroelectric and electrocaloric effects in epitaxial ferroelectric thin films. We demonstrate an electrothermal test platform where localized high-frequency (∼ 1 kHz) periodic heating and highly-sensitive thin-film resistance thermometry allow direct measurement of pyrocurrents (< 10 pA) and electrocaloric temperature changes (< 2 mK) using the "2-omega" and an adapted "3-omega" technique, respectively. Frequency-domain, phase-sensitive detection permits extraction of pyrocurrent from the total current, which is often convoluted by thermally-stimulated currents. The wide frequency range measurements employed in this study further show the effect of secondary contributions to pyroelectricity due to the mechanical constraints of the substrate. Similarly, measurement of the electrocaloric effect on the same device in the frequency-domain (∼ 100 kHz) allows decoupling of Joule heating from the electrocaloric effect. Using one-dimensional, analytical heattransport models, the transient temperature profile of the heterostructure is characterized to extract pyroelectric and electrocaloric coefficients.

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Direct electrocaloric measurements of a multilayer capacitor using scanning thermal microscopy and infra-red imaging

Cited by 78 publications

References 16 publications

Inverse barocaloric effects in ferroelectric BaTiO3 ceramics

Inverse barocaloric effects in ferroelectric BaTiO3 ceramics

Influence of epitaxial strain on elastocaloric effect in ferroelectric thin films

Direct Measurement of Pyroelectric and Electrocaloric Effects in Thin Films

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