研究目的
To investigate the electrocaloric effect (ECE) in tetragonal perovskite 0.03Bi(Mg1/2Ti1/2)O3–0.97(0.875Bi1/2Na1/2TiO3–0.125BaTiO3) lead-free ferroelectric ceramics and its potential application in solid-state refrigerators.
研究成果
The study demonstrates a large electrocaloric effect in the tetragonal perovskite lead-free ferroelectric ceramics, with a significant temperature change under an electric field, indicating its potential for application in solid-state refrigerators.
研究不足
The study is limited to the specific composition of 0.03Bi(Mg1/2Ti1/2)O3–0.97(0.875Bi1/2Na1/2TiO3–0.125BaTiO3) ceramics and does not explore other compositions or the scalability of the synthesis method for industrial applications.
1：Experimental Design and Method Selection:
The study focused on the ECE of lead-free ferroelectric ceramics with tetragonal perovskite structure, synthesized by the conventional solid oxide reaction route.
2：Sample Selection and Data Sources:
High purity chemical reagents were used to prepare the ceramics.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (XRD, D8 Advance, Bruker), field emission scanning electron microscope (SEM, S4800, Hitachi), precision inductance-capacitance-resistance meter (E4980A, Agilent), ferroelectric analyzer (Precision II, Radiant Technology).
4：Experimental Procedures and Operational Workflow:
The ceramics were synthesized, calcined, ball-milled, pressed into pellets, sintered, and then characterized for their phase structure, micromorphology, dielectric, and ferroelectric properties.
5：Data Analysis Methods:
The phase structure was analyzed using XRD, and the ECE was measured by the direct method.
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