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Tutorial

Electrothermal Phenomena in Ferroelectrics

International Center for Actuators and Transducers, The Pennsylvania State University, University Park, PA 16802, USA
Actuators 2020, 9(4), 93; https://doi.org/10.3390/act9040093
Received: 16 August 2020 / Revised: 9 September 2020 / Accepted: 16 September 2020 / Published: 23 September 2020
(This article belongs to the Special Issue Piezoelectric Actuators and Ultrasonic Motors: Future Perspectives)
Physical properties of lead-zirconate-titanate (PZT) ceramics change according to the initial electric poling process and electrical boundary conditions. This paper reports the electrothermal, piezothermal, and piezoelectric coupling phenomena in ferroelectrics from thermodynamics viewpoints, in particular, thermal property differences between unpoled and poled PZT’s in the poling direction for open circuit and short circuit conditions. We propose a new terminology, “secondary electrothermal” coupling factor kλ, which is analogous to the electromechanical coupling factor k, relating the elastic compliances under short- and open-circuit conditions, in order to explain the fact that the short-circuit condition exhibited the larger thermal diffusivity than the open-circuit condition. On the other hand, the unpoled specimen exhibits the lowest thermal diffusivity. This tutorial paper was authored for providing comprehensive knowledge on equilibrium and time-dependent thermodynamics in ferroelectrics. View Full-Text
Keywords: ferroelectric; electrothermal coupling; piezothermal effect; piezoelectrics; pyroelectric coefficient; specific heat capacity; thermal diffusivity; thermal expansion coefficient; electromechanical coupling factor ferroelectric; electrothermal coupling; piezothermal effect; piezoelectrics; pyroelectric coefficient; specific heat capacity; thermal diffusivity; thermal expansion coefficient; electromechanical coupling factor
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MDPI and ACS Style

Uchino, K. Electrothermal Phenomena in Ferroelectrics. Actuators 2020, 9, 93. https://doi.org/10.3390/act9040093

AMA Style

Uchino K. Electrothermal Phenomena in Ferroelectrics. Actuators. 2020; 9(4):93. https://doi.org/10.3390/act9040093

Chicago/Turabian Style

Uchino, Kenji. 2020. "Electrothermal Phenomena in Ferroelectrics" Actuators 9, no. 4: 93. https://doi.org/10.3390/act9040093

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