Electrocaloric effect in lead-free relaxor (1-x)(Sr0.7Bi0.2)TiO3+x(Na0.5Bi0.5)TiO3 material system

Li, Jinglei; Zhao, Xiuli; Wang, Chao; Zhang, Tian; Qian, Xiaoshi; Hou, Ying; Lu, Yang; Zhang, Shujun

doi:10.1016/j.matlet.2016.10.058

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…Besides, the newly designed BZT-BST exhibited much wider operation temperature range from about 10 to 60 °C. The ECE values obtained here are much superior to those of previously reported lead-free ferroelectrics − ,− and even higher than several widely used lead-based ones, − including the well-known PMN-PT relaxor ferroelectrics. The underlying mechanisms responsible for the dramatically improved EC performance of the BZT-BST bilayer thick films were discussed.…”

Section: Introductioncontrasting

confidence: 51%

“…Encouragingly, with the integration of chemical engineering and thick-film architecture design strategies, our newly designed BZT-BST bilayer thick films exhibited both ultrahigh room-temperature Δ T of ∼5.2 K and superior temperature stability of at least 50 K (from about 10 to 60 °C). These properties significantly outperform previously reported KNN-, NN-, BT-, and BNT-based lead-free bulk ceramics, − ,− and are even superior to many lead-based counterparts well-known for their strong ECE, including the attractive PMN–PT relaxor bulk ceramics and multilayers. − Besides, BZT-BST bilayer thick films exhibit higher EC properties than many previously reported BaTiO 3 -based thin films under the same level of electric fields. − Multiple phase coexistence near room temperature and improved electric field endurance should be responsible for the giant ECE of the BZT-BST bilayer thick films; meanwhile, ferroelectric relaxor behavior contributes to the stably maintained ECE over a broad temperature range. All of these suggest the tremendous potential of unique BZT-BST bilayer thick films for high-efficiency solid-state cooling applications.…”

Section: Resultsmentioning

confidence: 75%

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Lead-Free Bilayer Thick Films with Giant Electrocaloric Effect near Room Temperature

Chang

Yang

et al. 2019

ACS Appl. Mater. Interfaces

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Electrocaloric refrigeration utilizing ferroelectrics has recently gained tremendous attention because of the urgent demand for solid-state cooling devices. However, the low room-temperature electrocaloric effect and narrow operation temperature window hinder the implementation of lead-free ferroelectrics in high-efficiency cooling applications. In this work, chemical engineering and thick-film architecture design strategies were integrated into a BaTiO3-based system to resolve this challenge. Novel environmental-friendly Ba(Zr0.20Ti0.80)O3–Ba(Sn0.11Ti0.89)O3 (BZT-BST) bilayer films of ∼13 μm in single-layer thickness were prepared by the tape casting process. A giant adiabatic temperature change, ΔT ∼ 5.2 K, and a large isothermal entropy change, ΔS ∼ 6.9 J kg–1 K–1, were simultaneously achieved at room temperature based on the direct measurements, which are much higher than those reported previously in many lead-free ferroelectrics. Moreover, the BZT-BST thick films exhibited a remarkably widened operation temperature range from about 10 to 60 °C. These outstanding properties were mainly attributed to the multiphase coexistence near room temperature, relaxor ferroelectric characteristics, and improved electric-field endurance of the bilayer thick films. This work provides a guideline for the development of environment-friendly electronic materials with both ultrahigh and stable electrocaloric performance and will broaden the application areas of lead-free ferroelectrics.

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Section: Introductioncontrasting

confidence: 51%

Section: Resultsmentioning

confidence: 75%

Lead-Free Bilayer Thick Films with Giant Electrocaloric Effect near Room Temperature

Chang

Yang

et al. 2019

ACS Appl. Mater. Interfaces

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“… e Ba 0.85 Ca 0.15 Ti 0.94 Hf 0.06 O 3 f 0.35(Sr 0.7 Bi 0.2 )TiO 3 – 0.65(Na 0.5 Bi 0.5 )TiO 3 g Bi 0.5 Na 0.5 TiO 3 – 0.06BaTiO 3 …”

Section: Resultsunclassified

Substantially Enhanced Electrocaloric Effect in Ba(Zr_0.2Ti_0.8)O₃ Lead-Free Ferroelectric Ceramics via Lattice Stress Engineering

Zhang

Dou

Zeng

et al. 2023

ACS Appl. Mater. Interfaces

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As an alternative to conventional vapor-compression refrigeration, cooling devices based on electrocaloric (EC) materials are environmentally friendly and highly efficient, which are promising in realizing solid-state cooling. Lead-free ferroelectric ceramics with competitive EC performance are urgently desirable for EC cooling devices. In the past few decades, constructing phase coexistence and high polarizability have been two crucial factors in optimizing the EC performance. Different from the external stress generated through heavy equipment and inner interface stress caused by complex interface structures, the internal lattice stress induced by ion substitution engineering is a relatively simple and efficient means to tune the phase structure and polarizability. In this work, we introduce low-radius Li+ into BaZr0.2Ti0.8O3 (BZT) to form a particular A-site substituted cell structure, leading to a change of the internal lattice stress. With the increase of lattice stress, the fraction of the rhombohedral phase in the rhombohedral–cubic (R–C) coexisting system and ferroelectricity are all pronouncedly enhanced for the Li2CO3-doped sample, resulting in the significant enhancement of saturated polarization (P s) as well as EC performance [e.g., adiabatic temperature change (ΔT) and isothermal entropy change (ΔS)]. Under the same conditions (i.e., 333 K and 70 kV cm–1), the ΔT of 5.7 mol % Li2CO3-doped BZT is 1.37 K, which is larger than that of the pure BZT ceramics (0.61 K). Consequently, in cooperation with the great improvement of electric field breakdown strength (E b) from 70 to 150 kV cm–1, 5.7 mol % Li2CO3-doped BZT achieved a large ΔT of 2.26 K at a temperature of 333 K, which is a competitive performance in the field of electrocaloric effect (ECE). This work provides a simple but effective approach to designing high-performance electrocaloric materials for next-generation refrigeration.

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Electrocaloric effect in lead-free ferroelectric perovskites

Zhang

Peng

2023

The Electrocaloric Effect

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Electrocaloric effect in lead-free relaxor (1-x)(Sr0.7Bi0.2)TiO3+x(Na0.5Bi0.5)TiO3 material system

Cited by 6 publications

References 10 publications

Lead-Free Bilayer Thick Films with Giant Electrocaloric Effect near Room Temperature

Lead-Free Bilayer Thick Films with Giant Electrocaloric Effect near Room Temperature

Substantially Enhanced Electrocaloric Effect in Ba(Zr_0.2Ti_0.8)O₃ Lead-Free Ferroelectric Ceramics via Lattice Stress Engineering

Electrocaloric effect in lead-free ferroelectric perovskites

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Electrocaloric effect in lead-free relaxor (1-x)(Sr0.7Bi0.2)TiO3+x(Na0.5Bi0.5)TiO3 material system

Cited by 6 publications

References 10 publications

Lead-Free Bilayer Thick Films with Giant Electrocaloric Effect near Room Temperature

Lead-Free Bilayer Thick Films with Giant Electrocaloric Effect near Room Temperature

Substantially Enhanced Electrocaloric Effect in Ba(Zr0.2Ti0.8)O3 Lead-Free Ferroelectric Ceramics via Lattice Stress Engineering

Electrocaloric effect in lead-free ferroelectric perovskites

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Substantially Enhanced Electrocaloric Effect in Ba(Zr_0.2Ti_0.8)O₃ Lead-Free Ferroelectric Ceramics via Lattice Stress Engineering