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Vales Castro, Pablo
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Publications (5/5 displayed)
- 2021Direct visualization of antiferroelectric switching dynamics via electrocaloric imagingcitations
- 2021Pulsed laser deposition of epitaxial non-doped PbTiO3 thin films from Pbo-TiO2 mosaic targetscitations
- 2020P-type ultrawide-band-gap spinel ZnGa2O4 : new perspectives for energy electronicscitations
- 2020Control of Lateral Composition Distribution in Graded Films of Soluble Solid Systems A1-xBx by Partitioned Dual-Beam Pulsed Laser Depositioncitations
- 2020Control of lateral composition distribution in graded films of soluble solid systems A1-xBx by partitioned dual-beam pulsed laser depositioncitations
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article
Direct visualization of antiferroelectric switching dynamics via electrocaloric imaging
Abstract
The large electrocaloric coupling in PbZrO3 allows using high-speed infrared imaging to visualize antiferroelectric switching dynamics via the associated temperature change. We find that in ceramic samples of homogeneous temperature and thickness, switching is nucleation-limited and fast, with devices responding in the milisecond range. By introducing gradients of thickness, however, it is possible to change the dynamics from nucleation-limited to propagation-limited, whereby a single phase boundary sweeps across the sample like a cold front, at a speed of c.a. 20 cm/s. Additionally, introducing thermostatic temperature differences between two sides of the sample enables the simultaneous generation of a negative electrocaloric effect on one side and a positive one on the other, yielding a Janus-like electrocaloric response.