Effect of dopants on the electrocaloric effect of 0.92 Pb(Mg1/3Nb2/3)O3–0.08 PbTiO3 ceramics

Molin, Christian; Sanlialp, Mehmet; Shvartsman, Vladimir V.; Lupascu, Doru C.; Neumeister, Peter; Schönecker, Andreas; Gebhardt, Sylvia

doi:10.1016/j.jeurceramsoc.2015.01.016

Cited by 51 publications

(21 citation statements)

References 28 publications

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“…8,[43][44][45][46] Hence, people attach important to the direct measurement as a more effective method to evaluate the ECE. 47,48 Figure 7D-F exhibit the results of the direct ECE data of the ceramics measured under , where ∆Q is the specific heat exchange values calculated by integrating the area under the endothermic peaks, C p is heat capacity. Figure 7A-C display the typical heat flow curve of KNN-xBNZ ceramics with x = 0.03, 0.04 and 0.05 under different electric fields in an isothermal process.…”

Section: Resultsmentioning

confidence: 99%

“…However, the magnitude of exothermic and endothermic peaks is inconsistent a little, which is attributed to energy dissipation in dipolar switching and Joule heat. 47,48 Figure 7D , where ∆Q is the specific heat exchange values calculated by integrating the area under the endothermic peaks, C p is heat capacity. The ∆T increases firstly during the phase transition area and then fade slightly for all studied ceramics.…”

Section: Resultsmentioning

confidence: 99%

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Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Yang

Hao

2019

J Am Ceram Soc

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The issue of how to achieve an electrocaloric effect (ECE) and pyroelectric effect in a material simultaneously remains to be a challenge for developing practical solid‐state cooling devices and RF‐detectors. Here, we structure a polymorphic phase transition (PPT) region by doping modification in KNN‐based ceramics, which are developed to achieve the ECE. The direct measured ECE and pyroelectric properties are investigated in lead‐free (1‐x)K0.5Na0.5NbO3‐xBi0.5Na0.5ZrO3 (KNN‐xBNZ) ceramics. The adiabatic temperature change (∆T) of 0.22 K at 100°C, 0.14 K at 70°C and 0.16 K at 30°C can be obtained under an electric field of 35 kV cm–1 for x = 0.03, 0.04 and 0.05, respectively. In addition, the temperature dependence of pyroelectric coefficient (p) is established for all compositions via the Byer‐Roundy method. A large p of 454.46 × 10–4 C m–2 K–1 is detected at Curie temperature (TC) in the ceramics with x = 0.03. Achieving electrocaloric effect and pyroelectric performance simultaneously may shed light and provide a feasible design scheme for developing practically useful electrocaloric and pyroelectric materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Yang

Hao

2019

J Am Ceram Soc

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“…In a previous publication we showed that dielectric and hysteresis losses were significantly reduced by manganese and lithium doping. Further investigation has to show whether this is beneficial for reduction of heating under cycling driving fields …”

Section: Resultsmentioning

confidence: 99%

Multilayer Ceramics for Electrocaloric Cooling Applications

et al. 2018

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The electrocaloric effect of 0.92 Pb(Mg1/3Nb2/3)O3‐0.08 PbTiO3 (PMN‐8 PT) bulk ceramics and multilayer ceramic (MLC) structures is reported. The results are compared to lead‐free, barium‐titanate‐based materials. Phase transition temperature and electrocaloric temperature change could be altered by targeted doping and this is discussed with the help of dielectric and electrocaloric measurements. By reduction of single layer thickness in MLCs, electrical loads and thus electrocaloric temperature changes of PMN‐8 PT based multilayers could be increased. Simulations that outline the intrinsic cooling performance of electrocaloric MLC components in dependence of the multilayer design and operation frequency for two different modes of heat transfer are presented. The performance of the fabricated MLC layout for a driving frequency of 1 Hz is discussed in detail and an optimum layout by varying of design parameters derived. Additionally, the effect of driving frequency on the electrocaloric cooling power is investigated.

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“…Maximum temperature span was used as optimization criteria. In material selection, only barium titanate (in form of commercial capacitors as used by Kar‐Narayan and Mathur) and lead magnesium niobate‐lead titanate (PMN‐PT, custom made by Fraunhofer IKTS) could be considered due to availability reasons. Higher‐performing PMN‐PT was chosen.…”

Section: Resultsmentioning

confidence: 99%

“…The active elements where prepared at Fraunhofer IKTS from PMN‐8 PT. The samples had 9 active layers of 47 μm thickness, a surface of 8 mm×10 mm and silver electrodes.…”

Section: Methodsmentioning

confidence: 99%

Design Methodology for Electrocaloric Cooling Systems

Blumenthal

Raatz

2018

Energy Tech

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For over a decade now, the electrocaloric effect (ECE) and electrocaloric (EC) cooling have been the subject of increasing research activities. Research on electrocaloric materials (ECM) is quite advanced; however, significant progress on EC cooling systems is still missing. Therefore, a methodological approach for the structured development of EC cooling systems is presented here. It is based on the well‐known V‐Model and integrates different tools, as a classification of device types, influencing factors, and numerical simulation methods. The methodology can be used to structure development processes and to identify favorable geometrical and operating parameters of an EC cooling device. The methodology is validated with a demonstrator, which is designed, built, and practically tested for over 2000 h. With this small‐scale device and a low electrical field strength of 3 kV mm−1, a temperature span of over 1.1 K could be achieved.

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Effect of dopants on the electrocaloric effect of 0.92 Pb(Mg1/3Nb2/3)O3–0.08 PbTiO3 ceramics

Cited by 51 publications

References 28 publications

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Multilayer Ceramics for Electrocaloric Cooling Applications

Design Methodology for Electrocaloric Cooling Systems

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Effect of dopants on the electrocaloric effect of 0.92 Pb(Mg1/3Nb2/3)O3–0.08 PbTiO3 ceramics

Cited by 51 publications

References 28 publications

Electrocaloric effect and pyroelectric performance in (K,Na)NbO3‐based lead‐free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO3‐based lead‐free ceramics

Multilayer Ceramics for Electrocaloric Cooling Applications

Design Methodology for Electrocaloric Cooling Systems

Contact Info

Product

Resources

About

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics

Electrocaloric effect and pyroelectric performance in (K,Na)NbO₃‐based lead‐free ceramics