| Autor: |
Vales-Castro, Pablo, Vellvehi, Miquel, Perpiñà, Xavier, Caicedo, J. M., Jordà, Xavier, Faye, Romain, Roleder, Krystian, Kajewski, Dariusz, Perez-Tomas, Amador, Defay, Emmanuel, Catalan, Gustau |
| Rok vydání: |
2021 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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