Isomorphous ion substitutions and order-disorder phenomena in highly electrocaloric lead-scandium tantalate solid solutions

Shebanovs, L.; Sternberg, A.; Lawless, W. N.; Borman, K.

doi:10.1080/00150199608230266

Cited by 19 publications

(8 citation statements)

References 4 publications

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“…It exhibits a first-order ferroelectric to paraelectric (PE) phase transition near room temperature which makes it attractive for air conditioning. This transition can also be driven with an electric field leading to the EC effect, which is predominant at the material’s transition temperature 13 . The largest EC adiabatic temperature change ∆ T adiab 13 reported so far in bulk PST is 2.3 K at 50 kV cm −1 .…”

Section: Introductionmentioning

confidence: 99%

“…This transition can also be driven with an electric field leading to the EC effect, which is predominant at the material’s transition temperature 13 . The largest EC adiabatic temperature change ∆ T adiab 13 reported so far in bulk PST is 2.3 K at 50 kV cm −1 . Lately, Nair et al 20 measured a larger ∆ T adiab of 5.5 K in PST Multi-Layer Capacitors (MLCs) when driven supercritically at 290 kV cm −1 .…”

Section: Introductionmentioning

confidence: 99%

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Giant electrocaloric materials energy efficiency in highly ordered lead scandium tantalate

et al. 2021

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Electrocaloric materials are promising working bodies for caloric-based technologies, suggested as an efficient alternative to the vapor compression systems. However, their materials efficiency defined as the ratio of the exchangeable electrocaloric heat to the work needed to trigger this heat remains unknown. Here, we show by direct measurements of heat and electrical work that a highly ordered bulk lead scandium tantalate can exchange more than a hundred times more electrocaloric heat than the work needed to trigger it. Besides, our material exhibits a maximum adiabatic temperature change of 3.7 K at an electric field of 40 kV cm−1. These features are strong assets in favor of electrocaloric materials for future cooling devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Giant electrocaloric materials energy efficiency in highly ordered lead scandium tantalate

et al. 2021

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“…In this paper, we demonstrate a general solution to the net-transfer problem by constructing cooling cycles in which no net heat is exchanged between a homogeneous working body of the archetypal EC material PST 2,18,[36][37][38][39] and an ideal hypothetical regenerator that it traverses in order to achieve a large temperature span T h -T c >> |T|. The underlying principle is that the two regenerator-transit legs of a given cooling cycle can be made to differ by a constant entropy if the field applied during the finite-field leg is varied according to a detailed E(T,S) map of the highly reversible phase transition at finite fields above Curie temperature T C ~ 295 K, where E denotes electric field, T denotes temperature, and S denotes entropy S after subtracting the zero-field entropy at our base temperature of 285 K. In contrast with the highly restrictive solutions discussed above [33][34][35] , our strategy for true regeneration via field variation can be readily achieved by modifying standard cooling cycles, such as Ericsson cycles.…”

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confidence: 99%

Large electrocaloric effects in oxide multilayer capacitors over a wide temperature range

Nair

Usui

Crossley

et al. 2019

Nature

220

132

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There is growing interest in heat pumps based on materials that show thermal changes when phase transitions are driven by changes of electric, magnetic or stress field. Importantly, regeneration permits sinks and loads to be thermally separated by many times the changes of temperature that can arise in the materials themselves. However, performance and parameterization are compromised by net heat transfer between caloric working bodies and heat-transfer fluids. Here we show that this net transfer can be avoided-resulting in true, balanced regeneration-if one varies the applied electric field while an electrocaloric (EC) working body dumps heat on traversing a passive fluid regenerator. Our EC working body is represented by bulk PbSc 0.5 Ta 0.5 O 3 (PST) near its first-order ferroelectric phase transition, where we record directly measured adiabatic temperature changes of up to 2.2 K. Indirectly measured adiabatic temperature changes of similar magnitude were identified, unlike normal, from adiabatic measurements of polarization, at nearby starting for Electrocaloric cooling cycles in lead scandium tantalate with true regeneration via field variation

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“…3) Following his study, many ceramic materials were studied such as SrTiO 3 4) and KTaO 3 ,5) the antiferroelectric Pb(Zr,Ti)O 3 , 6) and the ferroelectrics Roshelle salt, 3) KH 2 PO 4 , 7) BaTiO 3 , 8) TGS, 9) Pb(Zr,Ti)O 3 , 6,10) Pb(Sc,Ta)O 3 , [11][12][13][14] and Pb(Mg,Nb)O 3 -PbTiO 3 . [15][16][17] However, these temperature changes were smaller than 2.5 K. 18) In 2006, Mischenko et al suggested that a much larger ΔT appears near the para=ferro critical point.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of a cooling system using electrocaloric effect

Honmi

Hashizume

Nakajima

et al. 2017

Jpn. J. Appl. Phys.

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A cooling system using the electrocaloric effect is investigated on the bases of the thermodynamic theory. The electrocaloric effect causes a temperature change of dielectric materials. In this study, we introduce a simple model of the cooling system including a target object, a heat removal body, and a dielectric material. We confirm that the temperature of the target object certainly decreases. Furthermore, we propose an efficient control procedure of the electric field for cooling the target object. As a result, we show that the temperature change is enhanced by the proposed method.

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Isomorphous ion substitutions and order-disorder phenomena in highly electrocaloric lead-scandium tantalate solid solutions

Cited by 19 publications

References 4 publications

Giant electrocaloric materials energy efficiency in highly ordered lead scandium tantalate

Giant electrocaloric materials energy efficiency in highly ordered lead scandium tantalate

Large electrocaloric effects in oxide multilayer capacitors over a wide temperature range

Thermodynamic analysis of a cooling system using electrocaloric effect

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