Large negative piezocaloric effect: Uniaxial stress effect. (April 2019)

• Record Type: Journal Article
• Authors: Bai, Gang; Xie, Qiyun; Xu, Jie; Gao, Cunfa
• Is Part Of: Solid state communications. Volume 291(2019)
• Page Start: 11
• Page End: 14
• Publication Date: 2019-04
• Subjects: A. PbZr1-xTixO3 -- D.Piezocaloric -- D. Phase transformation; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2019.01.002
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: In this study, a large negative piezocaloric effect (maximum Δ T ∼ −2 K) is reported for a bulk Pb(Zr0.52 Ti0.48 )O3 material using a Landau-Ginzburg-Devonshire (LGD) phenomenological approach. An uniaxial stress induced structural phase transitions (tetragonalT 1 to tetragonalT 2 and monoclinicM to tetragonalT 2) play a very key role in developing a giant negative caloric effect that is crucial for the enhancement of cooling efficiency. Highlights: A large negative PiCE appears near tetragonalT 1-tetragonalT 2 phase transition for initialT 1 phase. Another peak value of negative PiCE appears at monoclinicM -tetragonalT 2 phase transitions for initialR phase. The critical point betweenT 1 andT 2 can be tuned toward room temperature by the appropriate uniaxial compressive stress.