BaTiO₃-Based Electrocaloric Materials-Recent Progresses and Perspective.

Area of Science:

• Materials Science
• Solid-State Physics
• Thermodynamics

Background:

• Barium titanate (BaTiO3)-based lead-free ceramics are environmentally friendly alternatives for solid-state electrocaloric (EC) cooling.
• Their large spontaneous polarizations, adjustable Curie temperatures, and eco-friendliness make them suitable for advanced cooling technologies.

Purpose of the Study:

• To review recent advancements in the design and optimization of BaTiO3-based electrocaloric ceramics.
• To provide insights into the development of high-performance materials for solid-state cooling devices.

Main Methods:

• Summarizing thermodynamic principles of the electrocaloric effect (ECE).
• Analyzing structural phase transitions in BaTiO3-based ceramics.
• Reviewing design strategies like relaxor ferroelectrics and multi-phase coexistence.

Main Results:

• BaTiO3-based ceramics exhibit significant electrocaloric effects.
• Strategies such as relaxor ferroelectric construction and multi-phase coexistence enhance EC performance.
• Optimization involves understanding structural and thermodynamic properties.

Conclusions:

• BaTiO3-based ceramics are leading candidates for efficient and environmentally friendly solid-state electrocaloric cooling.
• Further research into microstructural evolution and polarization mechanisms is crucial.
• Bridging material design with device integration is key for practical applications.