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Direct Electrocaloric Characterization of Ceramic Films
Uros Prah1,2, Matej Sadl2,3, Alvar Torello1
1Materials Research and Technology Department, Luxembourg Institute of Science and Technology, Belvaux, 4422, Luxembourg.
Small Methods
|May 19, 2023
Summary
A new method using polymer substrates and infrared imaging accurately measures the electrocaloric effect in ceramic films. This technique overcomes limitations of previous methods, enabling precise characterization of material properties.
Area of Science:
- Materials Science
- Solid State Physics
- Thermodynamics
Background:
- Accurate characterization of the electrocaloric effect is crucial for understanding material properties.
- Existing direct measurement methods have limitations, especially for ceramic films.
- Indirect methods for ceramic films are less accurate, necessitating improved techniques.
Purpose of the Study:
- To develop a novel, direct method for measuring the electrocaloric effect in ceramic films.
- To address challenges related to rapid heat dissipation in thin ceramic films.
- To enable accurate quantification of the adiabatic electrocaloric effect.
Main Methods:
- Utilizing a polymer substrate to slow heat dissipation.
- Employing fast infrared imaging to detect electrically induced temperature changes.
- Measuring the electrocaloric effect in Pb(Mg1/3Nb2/3)O3-based ceramic films.
Main Results:
- The proposed method successfully captures a substantial part of the adiabatic electrocaloric effect.
- Infrared imaging reduced the adiabatic to measured electrocaloric temperature change ratio to approximately 3.5 for micrometer-sized films.
- Results from the new direct method showed good agreement with another direct thermometric method.
Conclusions:
- The developed approach offers a robust and accurate way to measure the electrocaloric effect in ceramic films.
- This technique overcomes the limitations of indirect methods and improves upon existing direct methods.
- The method has the potential to validate predictions of giant electrocaloric effects in ceramic materials.
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