Tuning the electrocaloric effect in 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 ceramics by relaxor phase blending

Liu, Feng; Li, Jiahao; Li, Shandong; Li, Tianyu; Si, Renjun; Wang, Chunchang; Zhai, Jiwei

doi:10.1016/j.ceramint.2019.10.171

Cited by 9 publications

(11 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A further current peak was observed moving in the opposite direction on the I−E curves, indicating the appearance of ergodic relaxor phase. 23,24 It is worth noting that the reversible polarization reaches a maximum at this point due to the contribution of the B-site defects to the polarization, in agreement with the prediction of phase-field simulations. Subsequently, electrostriction starts to dominate the positive strain, and the S−E curve changes to a cow horn shape with a noticeable increase in strain value (S = 0.48%).…”

Section: Phase-field Simulation Based On B-site Defectsupporting

confidence: 86%

“…Thermal perturbations impact the oriented alignment of the ferroelectric domains, resulting in a gradual refinement of the domain size as the temperature increases. 24 Macrodomains rapidly discrete into highly disordered PNRs near T FR , which corresponds to the strong temperature dependence exhibited by the EC response. Above the T FR , an ergodic relaxor phase is unable to establish a stable longrange ferroelectric sequence under the electric field; therefore, no significant domain morphology can be observed.…”

Section: Phase-field Simulation Based On B-site Defectmentioning

confidence: 88%

See 1 more Smart Citation

Achieving Ultrahigh Electrocaloric Response in (Bi_0.5Na_0.5)TiO₃-Based Ceramics through B-Site Defect Engineering

Lin,

Li,

Qian

et al. 2024

ACS Nano

Self Cite

View full text Add to dashboard Cite

Lead-free electrocaloric (EC) ferroelectrics are considered ideal for the next generation of environmentally friendly solid-state refrigeration materials. However, their inferior performance compared to lead-based materials significantly restricts their potential application. According to phase-field simulations, it is predicted that the pinning effect of a moderate number of defects can effectively enhance the reversible polarization response associated with the entropy change. Herein, sodium−bismuth titanate (BNT) ceramics with high spontaneous polarization are selected to construct B-site defects by introducing Li + and Nb 5+ . Under an electric field of 6 kV mm −1 , ultrahigh EC temperature changes of ΔT pos = 1.77 and ΔT neg = 1.49 K are achieved at 65 °C by direct measurement (ΔT neg > 1 K over 55−120 °C). Furthermore, ΔT neg remains above 0.70 K in the temperature range from 25 to 130 °C, exhibiting immense potential for practical applications. This study offers a promising direction for optimizing the EC response in defect systems.

show abstract

Section: Phase-field Simulation Based On B-site Defectsupporting

confidence: 86%

Section: Phase-field Simulation Based On B-site Defectmentioning

confidence: 88%

Achieving Ultrahigh Electrocaloric Response in (Bi_0.5Na_0.5)TiO₃-Based Ceramics through B-Site Defect Engineering

Lin,

Li,

Qian

et al. 2024

ACS Nano

Self Cite

View full text Add to dashboard Cite

show abstract

“…ECE originates from the change of polarization entropy in a polar material as an electric field applied on or removed off and is generally assessed by the isothermal entropy change (Δ S ) or adiabatic temperature change (Δ T ). Due to the current global requirement of environment friendliness, a number of studies have been performed on lead-free ferroelectrics, including BaTiO 3 (BT), (K, Na)NbO 3 (KNN), and (Na 1/2 Bi 1/2 )TiO 3 (NBT). − Table S1 compares the typical ECE performances of the three systems published in the recent 5 years. Thereinto, NBT-based ferroelectrics attract extensive attention due to their outstanding ECE.…”

Section: Introductionmentioning

confidence: 99%

“…In short, simultaneously improving the ECE and its temperature stability is a challenge in developing solid-state refrigeration devices based on NBT-based electrocaloric materials. To move the T FR to low temperatures, enhancing the relaxor behaviors by introducing a third perovskite compound or doping cations is a commonly adopted route. − , Luo et al introduced 25 mol % SrTiO 3 into 0.94NBT-0.06BT and realized a moderate Δ T of about 0.6 K around RT under 4 kV/mm . Wei et al introduced (Zn 1/3 Nb 2/3 ) 4+ complex cations into the B-site of 0.93NBT-0.07BT and obtained a large Δ T of about 1.14 K at 40 °C under 5 kV/mm .…”

Section: Introductionmentioning

confidence: 99%

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Zhu

Wei

et al. 2021

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

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(Na 1/2 Bi 1/2 )TiO 3 -0.07[(1 − x)-BaTiO 3 -x(Nd 2/3 □ 1/3 )(Zn 1/3 Nb 2/3 )O 3 ] (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. KEYWORDS: (Na 1/2 Bi 1/2 )TiO 3 , lead-free ceramics, A-site vacancy, B-site complex cation, electrocaloric effect, temperature stability

show abstract

“…The second type has more pronounced relief with grain boundaries located in "valleys", while the dense arrangement of tightly spaced grains is still maintained [11][12][13][14][15][16].…”

mentioning

confidence: 99%

Impact of Thermal Treatment on the Surface of Na0.5Bi0.5TiO3-Based Ceramics

et al. 2021

View full text Add to dashboard Cite

Thermal etching is a widely accepted surface treatment method for studying microstructure in Na0.5Bi0.5TiO3-based compositions. Surprisingly, besides the flat pattern of grains (suitable for evaluating ceramics’ microstructure), images illustrating well-expressed relief and even microstructure consisting of partly bonded cubic-shaped grains are also found among the micrographs presented in various publications. The present paper shows that this different surface character in Eu-modified Na0.5Bi0.5TiO3 can be obtained through thermal treatment across a wide range of temperatures. At higher temperatures, remarkable growth of cubic-shaped grains on the surface is observed. This growth affects the grain size distribution on the surface more than it does within the bulk of a sample. Such micrographs cannot be used to characterise the microstructure of dense ceramics. Intensive growth of TiO2 inclusions at high thermal treatment temperatures is also observed, revealing substantial evaporation of Bi and Na from the surface of a ceramic sample, but not from its core part.

show abstract

Tuning the electrocaloric effect in 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 ceramics by relaxor phase blending

Cited by 9 publications

References 38 publications

Achieving Ultrahigh Electrocaloric Response in (Bi_0.5Na_0.5)TiO₃-Based Ceramics through B-Site Defect Engineering

Achieving Ultrahigh Electrocaloric Response in (Bi_0.5Na_0.5)TiO₃-Based Ceramics through B-Site Defect Engineering

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Impact of Thermal Treatment on the Surface of Na0.5Bi0.5TiO3-Based Ceramics

Contact Info

Product

Resources

About

Tuning the electrocaloric effect in 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 ceramics by relaxor phase blending

Cited by 9 publications

References 38 publications

Achieving Ultrahigh Electrocaloric Response in (Bi0.5Na0.5)TiO3-Based Ceramics through B-Site Defect Engineering

Achieving Ultrahigh Electrocaloric Response in (Bi0.5Na0.5)TiO3-Based Ceramics through B-Site Defect Engineering

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

Impact of Thermal Treatment on the Surface of Na0.5Bi0.5TiO3-Based Ceramics

Contact Info

Product

Resources

About

Achieving Ultrahigh Electrocaloric Response in (Bi_0.5Na_0.5)TiO₃-Based Ceramics through B-Site Defect Engineering

Achieving Ultrahigh Electrocaloric Response in (Bi_0.5Na_0.5)TiO₃-Based Ceramics through B-Site Defect Engineering

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations