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

コレクション

引用

説明:

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.

権利情報:

• 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.

キーワード: electrocaloric effect, lock-in thermography

刊行年月日: 2025-03-01

出版者: AIP Publishing

掲載誌:

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

研究助成金:

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

原稿種別: 著者最終稿 (Accepted manuscript)

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

公開URL: https://doi.org/10.1063/5.0259805

関連資料:

その他の識別子:

連絡先:

更新時刻: 2025-04-22 12:30:19 +0900

MDRでの公開時刻: 2025-04-22 12:25:17 +0900