Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na1/2Bi1/2)TiO3‑Based Ceramics via the Synergic Effect of A‑Site Vacancies and B‑Site Complex Cations

Probing a lead-free ferroelectric with a large electrocaloric effect (ECE) and excellent temperature stability is a challenge in developing solid-state electrocaloric refrigeration. In this work, we constructed 0.93­(Na1/2Bi1/2)­TiO3-0.07­[(1 – x)­BaTiO3-x(Nd2/3□1/3)­(Zn1/3Nb2/3)­O3] (NZN100x) lead-...

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Bibliographic Details
Published in:ACS applied electronic materials 2021-11, Vol.3 (11), p.5023-5030
Main Authors: Li, Miaomiao, Zhu, Mankang, Wei, Qiumei, Zhang, Manlin, Zheng, Mupeng, Hou, Yudong, Zhu, Lipeng, Li, Yong, Hao, Xihong
Format: Article
Language:English
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Summary:Probing a lead-free ferroelectric with a large electrocaloric effect (ECE) and excellent temperature stability is a challenge in developing solid-state electrocaloric refrigeration. In this work, we constructed 0.93­(Na1/2Bi1/2)­TiO3-0.07­[(1 – x)­BaTiO3-x(Nd2/3□1/3)­(Zn1/3Nb2/3)­O3] (NZN100x) lead-free ferroelectric ceramics by introducing A-site vacancies and B-site complex cations simultaneously. Direct electrocaloric measurement shows that, for x = 0.14, a high ΔT of 1.17 K was obtained at 45 °C under 5 kV/mm; meanwhile, the sample x = 0.20 gives a large ΔT of 0.91 K with a 10% variation in a wide temperature span (T span) from 40 to 80 °C. The excellent ECE performance opens up a route for designing lead-free electrocaloric materials based on the synergic effect of composition design and defect engineering.
ISSN:2637-6113
2637-6113
DOI:10.1021/acsaelm.1c00799