Large electrocaloric effect over a wide temperature span in lead-free bismuth sodium titanate-based relaxor ferroelectrics

Xiaopo Su; Junjie Li; Yuxuan Hou; Ruowei Yin; Jianting Li; Shiqiang Qin; Yanjing Su; Lijie Qiao; Chuanbao Liu; Yang Bai

Journal of Materiomics (Mar 2023)

Large electrocaloric effect over a wide temperature span in lead-free bismuth sodium titanate-based relaxor ferroelectrics

Xiaopo Su,
Junjie Li,
Yuxuan Hou,
Ruowei Yin,
Jianting Li,
Shiqiang Qin,
Yanjing Su,
Lijie Qiao,
Chuanbao Liu,
Yang Bai

Affiliations

Xiaopo Su: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Junjie Li: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu, 610225, China
Yuxuan Hou: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Ruowei Yin: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Jianting Li: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China
Shiqiang Qin: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Yanjing Su: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Lijie Qiao: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Chuanbao Liu: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
Yang Bai: Beijing Advanced Innovation Center for Materials Genome Engineering, and Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.

Journal volume & issue: Vol. 9, no. 2
pp. 289 – 298

Abstract

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For efficient solid-state refrigeration technologies based on electrocaloric effect (ECE), it is a great challenge of simultaneously obtaining a large adiabatic temperature change (ΔT) within a wide temperature span (Tspan) in lead-free ferroelectric ceramics. Here, we studied the electrocaloric effect (ECE) in (1-x)(Na0.5Bi0.5)TiO3-xCaTiO3 ((1-x)NBT-xCT) and explored the combining effect of morphotropic phase boundary (MPB) and relaxor feature. The addition of CT not only constructs a MPB region with the coexistence of rhombohedral and orthorhombic phases, but also enhances the relaxor feature. The ECE peak appears around the freezing temperature (Tf), and shifts toward to lower temperature with the increasing CT amount. The directly measured ECE result shows that the ceramic of x = 0.10, which is in the MPB region, has an optimal ECE property of ΔTmax = 1.28 K @ 60 °C under 60 kV/cm with a wide Tspan of 65 °C. The enhanced ECE originates from the electric-field-induced transition between more types of polar nanoregions and long-range ferroelectric macrodomains. For the composition with more relaxor feature in the MPB region, such as x = 0.12, the ECE is relatively weak under low electric fields but it exhibits a sharp increment under a sufficiently high electric field. This work provides a guideline to develop the solid–state cooling devices for electronic components.

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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