Highly efficient and giant negative electrocaloric effect of a Nb and Sn co-doped lead zirconate titanate antiferroelectric film near room temperature

Zhao, Quanliang; Sheng, T Y; Pang, Lei; He, Guangping; Di, Jiejian; Zhao, Li‐Dong; Hou, Zhi‐Ling; Cao, Mao‐Sheng

doi:10.1039/c9ra06551b

Cited by 8 publications

(8 citation statements)

References 33 publications

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“…To understand the main characteristics of field-induced phase transition of PNZST films deposited on different electrodes, all the coefficients are normalized and assumed to be T = 20°C, T 0 = 190°C, a 1 = 1, b = c = 1/3 and g = 0.5. 26,39 Through the thermodynamic equilibrium, ∂f AFE /∂P 1 = ∂f AFE /∂P 2 = ∂f FE /∂P 3 = 0, following relations could be established by According to Equations (4), (7), and (8), the free energies of AFE and FE phases under different applied electric fields are shown in Figure 5A,B. It is indicated that the minimum free energy of AFE phase shifts from P = 0 to approximate P = 1.81 suddenly when E is larger than 0.54.…”

Section: Resultsmentioning

confidence: 99%

“…The different energy storage properties of PNZST/LNO and PNZST/Pt films could be explained by a thermodynamic model of AFE and FE phase coexistence system. According to the Kittel model, the free energy of AFE phase, f AFE , can be described by the FE polarization order parameter p and AFE polarization order parameter q as following Equations 26,39

\begin{matrix} f_{AFE} & = \frac{1}{4} a (p^{2} + q^{2}) + \frac{1}{32} b false(p^{4} + 6 p^{2} q^{2} + q^{4} false) \\ + \frac{1}{192} c (p^{6} + 15 p^{4} q^{2} + 15 p^{2} q^{4} + q^{6}) \\ + \frac{1}{4} g (p^{2} ‐ q^{2}) ‐ p E, \end{matrix}

p = P_{1} + P_{2}, q = P_{1} ‐ P_{2},

where P 1 and P 2 represent the polarization components for the two sub‐lattices 1 and 2, respectively. Here a , b , c are the Landau‐type expansion coefficients for each sub‐lattice, g is the AFE coupling strength and E is normalized applied electric field.…”

Section: Resultsmentioning

confidence: 99%

“…To understand the main characteristics of field‐induced phase transition of PNZST films deposited on different electrodes, all the coefficients are normalized and assumed to be T = 20°C, T 0 = 190°C, a 1 = 1, b = c = 1/3 and g = 0.5 26,39 . Through the thermodynamic equilibrium, ∂ f AFE /∂ P 1 = ∂ f AFE /∂ P 2 = ∂ f FE /∂ P 3 = 0, following relations could be established by

a false(\frac{p}{2} + \frac{q}{2} false) + b {(\frac{p}{2} + \frac{q}{2})}^{3} + c {(\frac{p}{2} + \frac{q}{2})}^{5} + g false(\frac{p}{2} ‐ \frac{q}{2} false) ‐ E = 0,

a false(\frac{p}{2} ‐ \frac{q}{2} false) + b {(\frac{p}{2} ‐ \frac{q}{2})}^{3} + c {(\frac{p}{2} ‐ \frac{q}{2})}^{5} + g false(\frac{p}{2} + \frac{q}{2} false) ‐ E = 0,

a P_{3} + b P_{3}^{3} + c P_{3}^{5} ‐ E = 0 .

…”

Section: Resultsmentioning

confidence: 99%

“…PNZST films on Pt/Ti/SiO 2 /Si and LNO/Si substrates (PNZST/Pt and PNZST/LNO) were prepared by a sol-gel process. 26 In brief, raw chemicals of zirconium propoxide, tin acetate, niobium ethoxide, tetrabutyl titanate [C 16 H 36 O 4 Ti], and lead acetate trihydrate were solved in 2-methoxyethanol and acetylacetone, followed by heating and stirring at 80ºC for 2 hours. The solution concentration was 0.3 mol/L.…”

Section: Methodsmentioning

confidence: 99%

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Energy storage and thermodynamics of PNZST thick films with coexisting antiferroelectric and ferroelectric phases

Zhao

Wang

et al. 2020

Int J Applied Ceramic Tech

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Antiferroelectric (AFE) materials have attracted increasing attention due to their potential applications for energy storage capacitors. Compared to ferroelectric (FE) materials, AFE capacitors can release a large amount of recoverable energy since its nearly zero remnant polarization (P r). 1-5 In recent years, many PbZrO 3 (PZ)-based AFE films have been reported to exhibit high recoverable energy density (W rec). 6-9 It is reported that the coexistence of FE phase in AFE materials was nearly unavoidable and has significantly effects on the polarization and phase transition. 10-15 However, there are few works investigating the effect of coexisting FE phase on the energy storage properties of PZ-based AFE films. Pt film is often employed as the bottom electrodes of PZbased AFE/FE films due to both superior conductivity and high temperature resistance of oxidation. 16,17 Nevertheless, oxygen vacancies accumulate easily at the interface of Pt electrodes, deteriorating the polarization and fatigue resistance of PZ-based films. 18,19 On the other hand, perovskite

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Section: Resultsmentioning

confidence: 99%

\begin{matrix} f_{AFE} & = \frac{1}{4} a (p^{2} + q^{2}) + \frac{1}{32} b false(p^{4} + 6 p^{2} q^{2} + q^{4} false) \\ + \frac{1}{192} c (p^{6} + 15 p^{4} q^{2} + 15 p^{2} q^{4} + q^{6}) \\ + \frac{1}{4} g (p^{2} ‐ q^{2}) ‐ p E, \end{matrix}

p = P_{1} + P_{2}, q = P_{1} ‐ P_{2},

Section: Resultsmentioning

confidence: 99%

a false(\frac{p}{2} + \frac{q}{2} false) + b {(\frac{p}{2} + \frac{q}{2})}^{3} + c {(\frac{p}{2} + \frac{q}{2})}^{5} + g false(\frac{p}{2} ‐ \frac{q}{2} false) ‐ E = 0,

a false(\frac{p}{2} ‐ \frac{q}{2} false) + b {(\frac{p}{2} ‐ \frac{q}{2})}^{3} + c {(\frac{p}{2} ‐ \frac{q}{2})}^{5} + g false(\frac{p}{2} + \frac{q}{2} false) ‐ E = 0,

a P_{3} + b P_{3}^{3} + c P_{3}^{5} ‐ E = 0 .

…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Energy storage and thermodynamics of PNZST thick films with coexisting antiferroelectric and ferroelectric phases

Zhao

Wang

et al. 2020

Int J Applied Ceramic Tech

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“…[ 21,22 ] Therefore, AFE films will exhibit a distinctly different stress‐induced polarization, and related thermal and electrical properties. [ 23–26 ] Up to now, these aspects still remain less understood, whether in theory or experiment.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO₃ Antiferroelectric Film

Wang

Zhao

et al. 2021

Physica Status Solidi (a)

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A thermodynamic model is established to investigate the effects of internal stress in PbZrO3 (PZ) antiferroelectric (AFE) film on the barocaloric effect (BCE), electrocaloric effect (ECE), and energy storage properties. It is found that the internal stress can change the phase transition behaviors and free energy barriers among AFE, ferroelectric (FE), and paraelectric (PE) phases. For the BCE, it occurs only in the FE phase induced by stress or temperature. Under a certain temperature, the optimized negative and positive ECE can be obtained by controlling the internal stress and electric field. In addition, the switching electric field of the AFE→FE phase transition increases and causes a larger recoverable energy density with decreasing tensile stress. These results are analyzed and explained by tricritical points (3 cp) with different stresses, temperatures, and electric fields. Therefore, this thermodynamic model provides an effective route to optimize the BCE, ECE, and energy storage properties of PZ films.

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Rietveld refinement structure, electric, dielectric and ferroelectric properties of lead-free Ba0.985Sr0.015Zr0.10Ti0.90O3 ceramics

Das

Matin

Hossain

2021

J Mater Sci: Mater Electron

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Highly efficient and giant negative electrocaloric effect of a Nb and Sn co-doped lead zirconate titanate antiferroelectric film near room temperature

Abstract: A giant negative ECE of a PNZST film with a high electrocaloric coefficient and coefficient of performance near room temperature.

Cited by 8 publications

References 33 publications

Energy storage and thermodynamics of PNZST thick films with coexisting antiferroelectric and ferroelectric phases

Energy storage and thermodynamics of PNZST thick films with coexisting antiferroelectric and ferroelectric phases

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO₃ Antiferroelectric Film

Rietveld refinement structure, electric, dielectric and ferroelectric properties of lead-free Ba0.985Sr0.015Zr0.10Ti0.90O3 ceramics

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Highly efficient and giant negative electrocaloric effect of a Nb and Sn co-doped lead zirconate titanate antiferroelectric film near room temperature

Abstract: A giant negative ECE of a PNZST film with a high electrocaloric coefficient and coefficient of performance near room temperature.

Cited by 8 publications

References 33 publications

Energy storage and thermodynamics of PNZST thick films with coexisting antiferroelectric and ferroelectric phases

Energy storage and thermodynamics of PNZST thick films with coexisting antiferroelectric and ferroelectric phases

Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO3 Antiferroelectric Film

Rietveld refinement structure, electric, dielectric and ferroelectric properties of lead-free Ba0.985Sr0.015Zr0.10Ti0.90O3 ceramics

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Thermodynamic Analysis of Stress‐Mediated Barocaloric Effect, Electrocaloric Effect, and Energy Storage of PbZrO₃ Antiferroelectric Film