Defect-controlled electrocaloric effect in PbZrO<sub>3</sub>thin films

Wu, Ming; Song, Dongsheng; Vats, Gaurav; Ning, Shoucong; Guo, Mengyao; Zhang, Dawei; Xue, Deqing; Pennycook, Stephen J.; Lou, Xiaojie

doi:10.1039/c8tc03965h

Cited by 42 publications

(29 citation statements)

References 51 publications

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“…al. reported that both interface and defects show great effect on the ECE of PZO films and remarkably improved the negative ECE by interface engineering [14,15]. By structural tailoring, Li et.…”

Section: Introductionmentioning

confidence: 99%

Adjustable giant negative electrocaloric effect in Pb1+xZrO3 thin films

Huang

Lin

et al. 2021

Preprint

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Electrocaloric effect (ECE) driven by electric field is suitable for implementation of built-in cooling in electronic devices. However, most of the known electrocaloric materials show low adiabatic temperature change ( ) near room temperature and usually require high electric field. Here, the investigation of ECE in Pb 1+x ZrO 3 (x=0, 0.1, 0.15) thin films, which were prepared on Pt/Ti/SiO 2 /Si substrates by sol-gel method, reveals that both the magnitude and the present temperature range of can be controlled by Pb concentration. Through increasing the dosage of PbO, decreased lead vacancies and enhanced interface layer are induced, which postpone the transition from antiferroelectrics to ferroelectrics of PbZrO 3 films under a given electric field ( E ), which thus controls the appearance temperature range of negative ECE. As a result, large isothermal entropy change ( and are observed in the temperature range from 260 K to 494 K, depending on the applied electric field and Pb concentration. Giant ECE ( , ~0.054) at room temperature (303 K) is obtained in Pb 1.1 ZrO 3 films under 460 kV/cm. This result provides a convenient method for modulating ECE of PbZrO 3 -based materials and will benefit its applications in cooling devices.

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Section: Introductionmentioning

confidence: 99%

Adjustable giant negative electrocaloric effect in Pb1+xZrO3 thin films

Huang

Lin

et al. 2021

Preprint

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“…The change of dipolar entropy upon the application of electric field results in a temperature change under adiabatic conditions; this phenomenon is called the electrocaloric effect [1,5]. The electrocaloric effect is large around the phase transitions in ferroelectric as well as antiferroelectric materials such as ferroelectric to paraelectric [6], antiferroelectric to ferroelectric [7] or ferroelectric to ferroelectric [8] phase transitions where large entropy changes take place. Ceramic and polymer ferroelectric materials in bulk as well as in thin and thick ceramic film forms are studied as electrocaloric materials [4].…”

Section: Introductionmentioning

confidence: 99%

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Kurnia

Emriadi

Mufti

et al. 2020

Journal of Alloys and Compounds

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We have investigated the electrocaloric properties of K + and Na + co-substituted Sr 0.6 Ba 0.4 Nb 2 O 6 (SBN) ceramics using the indirect method. Tetragonal tungsten bronze (K 0.5 Na 0.5 ) 2x (Sr 0.6 Ba 0.4 ) 5-x Nb 10 O 30 (KNSBN) with x = 0.24 was synthesized using dual-step sintering. Despite the low amount, K + and Na + co-substitution resulted in normal ferroelectric behaviour, showing no significant shift in the dielectric maximum temperature of 111°C with increasing frequency. Maximum electrocaloric temperature change (ΔT) of 0.3 K was observed at an electric field of 30 kV/cm (ΔE) yielding the largest electrocaloric responsivity (ΔT/ΔE) among SBN based ceramics. This relatively large value is in agreement with the larger pyroelectric coefficient of KNSBN compared to SBN based ceramics.

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“…These Pb-free ceramic families include BaTiO 3 , Na 0.5 Bi 0.5 TiO 3 [5,6], K 0.5 Na 0.5 NbO 3 based materials [7] as well as layered ferroelectrics such as Aurivilius [8] and tetragonal bronze [9] phases. More recently, defect engineering strategies are also being explored to increase ΔT [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrocaloric properties of Ba0.8Sr0.2Ti1-xZrxO3 (0≤x≤0.1) system: The balance between the nature of the phase transition and phase coexistence

Şanlı

Adem

2020

Ceramics International

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We investigate the electrocaloric effect of Ba 0.8 Sr 0.2 Ti 1-x Zr x O 3 (0 ≤ x ≤ 0.1) system by comparing the electrocaloric temperature change (ΔT) of different compositions belonging to the different regions of the phase diagram. We show that as the amount of Zr increases, electrocaloric temperature change initially decreases as the phase transition gets diffuse then increases again as the composition of the samples are located closer to the critical point where different ferroelectric phases coexist. Since the critical point is reached at relatively low Zr substitution levels (i.e. around x = 0.07), the phase transition doesn't get too diffuse and thefore the compositions between x = 0 and x = 0.10 (which contains higher Zr than the critical point composition) have comparable ΔT values. Electrocaloric efficiency of these compositions (x = 0.03, 0.05 and 0.07) is around 0.20 K mm/kV at 20 kV/cm. We discuss the results in terms of the balance between the nature of the phase transition and proximity to the critical point, based on the phase diagram.

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Defect-controlled electrocaloric effect in PbZrO₃thin films

Abstract: The structure and elemental distribution of PbZrO3 thin films are investigated. Defect controlled electrocaloric effects are discussed.

Cited by 42 publications

References 51 publications

Adjustable giant negative electrocaloric effect in Pb1+xZrO3 thin films

Adjustable giant negative electrocaloric effect in Pb1+xZrO3 thin films

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Electrocaloric properties of Ba0.8Sr0.2Ti1-xZrxO3 (0≤x≤0.1) system: The balance between the nature of the phase transition and phase coexistence

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Defect-controlled electrocaloric effect in PbZrO3thin films

Abstract: The structure and elemental distribution of PbZrO3 thin films are investigated. Defect controlled electrocaloric effects are discussed.

Cited by 42 publications

References 51 publications

Adjustable giant negative electrocaloric effect in Pb1+xZrO3 thin films

Adjustable giant negative electrocaloric effect in Pb1+xZrO3 thin films

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Electrocaloric properties of Ba0.8Sr0.2Ti1-xZrxO3 (0≤x≤0.1) system: The balance between the nature of the phase transition and phase coexistence

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Defect-controlled electrocaloric effect in PbZrO₃thin films