Designing coexisting multi-phases in PZT multilayer thin films: an effective way to induce large electrocaloric effect

Wang, Sichun; Zhang, Tiandong; Zhang, Changhai; Chi, Qingguo; Li, Weili

doi:10.1039/c9ra10896c

Cited by 11 publications

(4 citation statements)

References 41 publications

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“…Although initial structural studies of MPR in PZT and BZCT described these systems as a mixture of terminal phases with rhombohedral (R) and tetragonal (T ) crystal structures below the Curie temperature [20,34,35], later investigations using high-energy diffraction techniques revealed the coexistence of a bridging phase in both systems at the morphotropic compo-sition [29,30,31]. The MPR in PZT is characterized by a narrow monoclinic region around the equimolar composition between terminal T and R phases [36,37,38], whereas that in BZCT shows an wider region containing an intermediate phase with orthorhombic symmetry [39]. However, there exists uncertainty in determining phase coexistence at the morphotropic region of BZCT at the room temperature [39,40,20,22,23,41].…”

Section: Yu Et Al Partially Substituted Timentioning

confidence: 99%

Stability, Evolution and Switching of Ferroelectric Domain Structures in Lead-free BaZr$_{0.2}$Ti$_{0.8}$O$_3$-Ba$_{0.7}$Ca$_{0.3}$TiO$_3$ System: Thermodynamic Analysis and Phase-field Simulations

Bandyopadhyay,

Jogi,

Ramadurai

et al. 2021

Preprint

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Enhanced room-temperature electromechanical coupling in the lead-free ferroelectric system (1 − x)BaZr 0.2 Ti 0.8 O 3 -xBa 0.7 Ca 0.3 TiO 3 (abbreviated as BZCT) at x = 0.5 is attributed to the existence of a morphotropic phase region (MPR) containing an intermediate orthorhombic (O) phase between terminal rhombohedral (R) BZT and tetragonal (T ) BCT phases. However, there is ambiguity regarding morphotropic phase transition in BZCT at room temperature -while some experiments suggest a single O phase within the MPR, others indicate coexistence of three polar phases (T + R + O). Therefore, to understand thermodynamic stability of polar phases and its relation to electromechanical switching during morphotropic phase transition in BZCT, we develop a Landau potential based on the theory of polar anisotropy. Since intrinsic electrostrictive anisotropy changes as a function of electromechanical processing, we establish a correlation between the parameters of our potential and the coefficients of electrostriction. We also conducted phase-field simulations based on this potential to demonstrate changes in domain configuration from single-phase O to three-phase T + R + O at the equimolar composition with the increase in electrostrictive anisotropy.

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Section: Yu Et Al Partially Substituted Timentioning

confidence: 99%

Stability, Evolution and Switching of Ferroelectric Domain Structures in Lead-free BaZr$_{0.2}$Ti$_{0.8}$O$_3$-Ba$_{0.7}$Ca$_{0.3}$TiO$_3$ System: Thermodynamic Analysis and Phase-field Simulations

Bandyopadhyay,

Jogi,

Ramadurai

et al. 2021

Preprint

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“…In this range, the value of Δ T decreases with the increase of x and mostly depends on the magnitude of the electric field . Thus, constructing the phase structure through composition design is effective to enhance the ECE strength for lead and lead-free ceramics, such as (Pb 1– x La x )(Zr y Ti 1– y )O 3 , , Ba(Sn x Ti 1– x )O 3, and 1 – x Na 0.5 Bi 0.5 TiO 3 – x SrTiO 3 In addition to phase structure designing, the P s is also closely bound up with the ECE performance .…”

Section: Introductionmentioning

confidence: 99%

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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“…[14][15][16][17] Many researchers have tried to improve these systems by phase transition modification. [18][19][20][21] For instance, the temperature of the phase transition from rhombohedral ferroelectric to cubic paraelectric can be effectively regulated from room temperature to 500 K by adjusting the PT content in PMN-PT systems, and the relaxation property can also be tailored. 22 An annealing procedure was used to increase the order degree of the PST sample.…”

Section: Introductionmentioning

confidence: 99%

“…Lead‐free EC materials, such as Ba(Zr 0.2 Ti 0.8 )O 3 (BZT), K 0.5 Na 0.5 NbO 3 (KNN), and Bi 0.5 Na 0.5 TiO 3 (BNT), have also presented high EC responses 14–17 . Many researchers have tried to improve these systems by phase transition modification 18–21 . For instance, the temperature of the phase transition from rhombohedral ferroelectric to cubic paraelectric can be effectively regulated from room temperature to 500 K by adjusting the PT content in PMN‐PT systems, and the relaxation property can also be tailored 22 .…”

Section: Introductionmentioning

confidence: 99%

Grain‐orientation‐engineered PMN‐10PT ceramics for electrocaloric applications

Cheng

et al. 2022

J Am Ceram Soc.

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The electrical properties of ferroelectric materials depend on their crystal orientations. The 〈001〉 and 〈111〉 textured 0.90Pb(Mg1/3Nb2/3)O3–0.10PbTiO3 (PMN‐10PT) ceramics were synthesized using a template grain growth method and conventional solid sintering process. The Lotgering factors of the 〈001〉 and 〈111〉 textured PMN‐10PT ceramics with 5% anisotropic BaTiO3 (BT) precursors were 95% and 87%, respectively. The influence of grain orientation direction on dielectric properties was investigated, revealing that the permittivity of textured PMN‐10PT ceramics (εr〈001〉 = 12200, εr〈111〉 = 11800) was lower than that of random ceramics (εr = 18700). Electrocaloric (EC) responses of the random and textured samples were analyzed using an indirect polarization‐deduced method based on Maxwell's equations. When the applied field was 50 kV cm−1, the 〈111〉 textured ceramics exhibited an enhanced adiabatic temperature change of 1.30 K, which was 20% higher than that of the random samples. In addition, the EC performance of the 〈111〉 oriented samples was significantly improved compared to that of the 〈001〉 oriented ones. This work characterizes the grain‐orientation‐dependent EC responses in the PMN‐PT system, which would be a promising approach to EC response improvement in ferroelectric ceramics.

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Designing coexisting multi-phases in PZT multilayer thin films: an effective way to induce large electrocaloric effect

Abstract: Coexisting multi-phases in PbZrxTi1−xO3 multilayer thin films were successfully fabricated using the sol–gel method.

Cited by 11 publications

References 41 publications

Stability, Evolution and Switching of Ferroelectric Domain Structures in Lead-free BaZr$_{0.2}$Ti$_{0.8}$O$_3$-Ba$_{0.7}$Ca$_{0.3}$TiO$_3$ System: Thermodynamic Analysis and Phase-field Simulations

Stability, Evolution and Switching of Ferroelectric Domain Structures in Lead-free BaZr$_{0.2}$Ti$_{0.8}$O$_3$-Ba$_{0.7}$Ca$_{0.3}$TiO$_3$ System: Thermodynamic Analysis and Phase-field Simulations

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

Grain‐orientation‐engineered PMN‐10PT ceramics for electrocaloric applications

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Designing coexisting multi-phases in PZT multilayer thin films: an effective way to induce large electrocaloric effect

Abstract: Coexisting multi-phases in PbZrxTi1−xO3 multilayer thin films were successfully fabricated using the sol–gel method.

Cited by 11 publications

References 41 publications

Stability, Evolution and Switching of Ferroelectric Domain Structures in Lead-free BaZr$_{0.2}$Ti$_{0.8}$O$_3$-Ba$_{0.7}$Ca$_{0.3}$TiO$_3$ System: Thermodynamic Analysis and Phase-field Simulations

Stability, Evolution and Switching of Ferroelectric Domain Structures in Lead-free BaZr$_{0.2}$Ti$_{0.8}$O$_3$-Ba$_{0.7}$Ca$_{0.3}$TiO$_3$ System: Thermodynamic Analysis and Phase-field Simulations

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

Grain‐orientation‐engineered PMN‐10PT ceramics for electrocaloric applications

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