Chen Cai, Wang Sichun, Zhang Tiandong, Zhang Changhai, Chi Qingguo, Li Weili
School of Electrical and Electronic Engineering, Harbin University of Science and Technology Harbin 150080 PR China
School of Electrical Engineering and Automation, Harbin Institute of Technology Harbin 150001 PR China.
RSC Adv. 2020 Feb 12;10(11):6603-6608. doi: 10.1039/c9ra10896c. eCollection 2020 Feb 7.
Coexisting multi-phases in PbZr Ti O multilayer thin films were successfully fabricated using the sol-gel method. The microstructure and electrical of the multilayer films with different growth sequences, including the up multilayer films and down multilayer films, have been systematically investigated. The results indicate that a large electrocaloric effect (ECE) is obtained at the temperatures much below the Curie temperature. At room temperature (25 °C), the change in temperature (Δ) values of the up multilayer and down multilayer thin films are 20.2 K with the applied electric field = 826 kV cm and 46.3 K with the = 992 kV cm, respectively. In addition, both the films exhibit outstanding ECE of around 145 °C, and Δ values of 28.9 K and 14.8 K have been obtained for the up multilayer and down multilayer thin films. The results indicate that the antiferroelectric/ferroelectric (AFE/FE), ferroelectric/ferroelectric (FE/FE) phase transition and the synergistic effect of the AFE/FE and FE/FE phase transition are as effective as the FE/PE phase transition. In particular, the multilayer thin films are endowed with refrigeration ability at multi-temperature zones due to the coexistence of multi-phases.
采用溶胶-凝胶法成功制备了PbZrTiO多层薄膜中的共存多相。系统研究了具有不同生长顺序的多层薄膜的微观结构和电学性能，包括上多层薄膜和下多层薄膜。结果表明，在远低于居里温度的温度下获得了较大的电热效应（ECE）。在室温（25°C）下，上多层和下多层薄膜的温度变化（Δ）值在施加电场=826 kV/cm时为20.2 K，在=992 kV/cm时分别为46.3 K。此外，两种薄膜均表现出约145°C的出色ECE，上多层和下多层薄膜的Δ值分别为28.9 K和14.8 K。结果表明，反铁电/铁电（AFE/FE）、铁电/铁电（FE/FE）相变以及AFE/FE和FE/FE相变的协同效应与FE/PE相变一样有效。特别是，由于多相共存，多层薄膜在多温度区具有制冷能力。
