Download file (1.55 MB)
Download as zip (1.51 MB)

Collection

Citation

Description:

The electrocaloric effect (ECE)-induced temperature change (ΔT) in (Ba, Sr)TiO3-based ferroelectrics under unipolar electric fields was analyzed from the separate contributions of the dielectric constant (ε) and remanent polarization (Pr) based on the Maxwell relation. Consideration of the contributions of both ε and Pr is particularly important in a unipolar electric field operation, such as on/off field switching used in device applications. Direct ΔT measurements were also performed based on the lock-in thermography technique to verify the accuracy of the ΔT intensity estimated by the indirect method. The indirect and direct ΔT values were largely consistent. The ΔT intensity near the peak temperature of ΔT was dominated by the Pr contribution; a large 𝜕𝑃𝑟/𝜕𝑇 was necessary to increase the overall ΔT magnitude. In contrast, a large 𝜕𝜀/𝜕𝑇 was essential to expand the operating temperature range of ΔT at temperatures higher than the dielectric maximum temperature. Quantitative understanding of the contributions of both ε and Pr to ΔT in unipolar electric fields is expected to guide the search for materials with a superior ECE.

Rights:

• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yukiya Tanaka, Ryo Iguchi, Takashi Teranishi, Shinya Kondo, Akira Kishimoto; Permittivity and remanent polarization contributions to the electrocaloric effect in (Ba, Sr)TiO3 under unipolar field. Appl. Phys. Lett. 31 March 2025; 126 (13): 132902 and may be found at https://doi.org/10.1063/5.0259805.

Keyword: electrocaloric effect, lock-in thermography

Date published: 2025-03-01

Publisher: AIP Publishing

Journal:

• Applied Physics Letters (ISSN: 00036951) vol. 126 issue. 13

Funding:

• Japan Society for the Promotion of Science 24K01334
• Japan Society for the Promotion of Science 24K01162
• Japan Society for the Promotion of Science 22H04965

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5447

First published URL: https://doi.org/10.1063/5.0259805

Related item:

Other identifier(s):

Contact agent:

Updated at: 2025-04-22 09:00:55 +0900

Published on MDR: 2025-04-22 12:25:17 +0900