Direct electrocaloric measurement of 0.9Pb(Mg_(1/3) Nb_(2/3))O₃-0.1PbTiO₃ films using scanning thermal microscopy
Applied Physics Letters
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Crossley, S., Usui, T., Kar-Narayan, S., Moya Raposo, X., Hirose, S., Ando, A., & Mathur, N. (2016). Direct electrocaloric measurement of 0.9Pb(Mg_(1/3) Nb_(2/3))O₃-0.1PbTiO₃ films using scanning thermal microscopy. Applied Physics Letters, 108 (032902)https://doi.org/10.1063/1.4938758
We show that scanning thermal microscopy (SThM) can measure reversible electrocaloric (EC) effects in <40 μm-thick ceramic films of the relaxor ferroelectric 0.9Pb(Mg_(1/3)Nb_(2/3))O₃-0.1PbTiO₃, with the substrate present. We recorded roughly the same non-adiabatic temperature change (±0.23 K) for a thinner film that was driven harder than a thicker film (±31 V μm⁻¹ across 13 μm versus ±11 V μm⁻¹ across 38 μm), because the thicker film lay relatively closer to the substantially larger adiabatic values that we predicted by thermodynamic analysis of electrical data. Film preparation was compatible with the fabrication of EC multilayer capacitors (MLCs), and therefore our measurement method may be exploited for rapid characterisation of candidate films for cooling applications.
Temperature measurement, Relaxor ferroelectrics, Ceramics, Multileaf collimators, Polymer films
B. N. is grateful for support from Gates Cambridge and the Winton Programme for the Physics of Sustainability. X. M. and S.K.-N. are grateful for support from the Royal Society.
Royal Society (dh110046)
Royal Society (uf120210)
External DOI: https://doi.org/10.1063/1.4938758
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253423
Attribution-NonCommercial 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc/2.0/uk/
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