Electro-caloric effect in (Ba1−xCax)(Zr0.05Ti0.95)O3: A lead-free ferroelectric material

Singh, Gurvinderjit; Tiwari, Vaibhav; Gupta, P. K.

doi:10.1063/1.4829635

Cited by 98 publications

(46 citation statements)

References 29 publications

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“…Polynomial of fourth order is fitted (R 2 = 0.9997, 1, 0.9999, and 0.9999) for electric field of 10, 14.5, 18, and 21.5 kV/cm, respectively. A number of researchers have used similar type of polynomial fitting to estimate the electrocaloric effect in ferroelectric ceramics . It is clearly observed that as electric field increases, saturation polarization also increases in accordance with the discussion provided earlier.…”

Section: Resultssupporting

confidence: 74%

“…Electrocaloric effect (adiabatic temperature change Δ T ) and the isothermal entropy change Δ S can be estimated using the following Maxwell's relationships:

Δ T = \frac{T}{- ρ C} \int_{E_{2}}^{E_{1}} ()(, \frac{d P_{s}}{d T}) d E

Δ S = - \int_{E_{2}}^{E_{1}} ()(, \frac{d P_{s}}{d T}) d E

where ρ and C are the density and specific heat capacity, respectively. For similar type of composition (Ba 0.9 Ca 0.1 )(Zr 0.05 Ti 0.95 )O 3 , the absolute value of specific heat capacity is reported by Singh et al . in the temperature range of 25–140°C.…”

Section: Resultsmentioning

confidence: 99%

“…In this context, Olsen cycle‐based thermal energy harvesting capabilities have been studied, which are comparable with other lead‐based materials . Further, a number of studies have demonstrated electrocaloric potential in BaZr 0.2 Ti 0.8 O 3 (BZT) and (Ba 1−x Ca x )(Zr y Ti 1−y )O 3 ‐based compositions …”

Section: Introductionmentioning

confidence: 89%

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Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Ceramics

Patel

Chauhan

Vaish

2015

Int J Applied Ceramic Tech

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This article presents electrocaloric effect in Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (BCTZO) using an indirect approach based on Maxwell's relations. The peak electrocaloric performance is found to be an adiabatic temperature change of 0.41 K with electrocaloric strength of 19 mK cm/kV and a heat carrying capacity of~0.17 J/g under an electric field of 0-21.5 kV/cm. The ferroelectric hysteresis scaling relations for coercive field (E C ), remnant polarization (P r ), and hysteresis area () as a function of temperature (T) are also systematically investigated. The power-law temperature exponents are obtained for all the hysteresis parameters. The scaling relations are established as E c / T À0.6584 , P r / T À1.59 , and / T À1.01623 . The presented scaling relations are compared with those reported in the literature for other ferroelectric materials.

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Section: Resultssupporting

confidence: 74%

“…Electrocaloric effect (adiabatic temperature change Δ T ) and the isothermal entropy change Δ S can be estimated using the following Maxwell's relationships:

Δ T = \frac{T}{- ρ C} \int_{E_{2}}^{E_{1}} ()(, \frac{d P_{s}}{d T}) d E

Δ S = - \int_{E_{2}}^{E_{1}} ()(, \frac{d P_{s}}{d T}) d E

Section: Resultsmentioning

confidence: 99%

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Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Ceramics

Patel

Chauhan

Vaish

2015

Int J Applied Ceramic Tech

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“…[10][11][12] Singh et al 13 reported recently rather large electrocaloric responsivity coefficient (DT/DE) of 0.253 K mm/kV in (Ba 1Àx Ca x )(Zr 0.05 Ti 0.95 )O 3 with x ¼ 0.08 near tetragonal-to-cubic phase transition. However, only 0.15 K mm/kV was reported in (1 À x)BaZr 0.2 Ti 0.8 O 3 -x Ba 0.7 Ca 0.3 TiO 3 compounds for x ¼ 0.3.…”

mentioning

confidence: 99%

Lead-free Ba0.8Ca0.2(ZrxTi1−x)O3 ceramics with large electrocaloric effect

Asbani

Dellis

Lahmar

et al. 2015

Applied Physics Letters

136

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“…Since a giant ECE of ∆T max = 12K was obtained in PbZr 0.95 Ti 0.05 O 3 thin film in 2006 [1], the researches on ECE boom in various ferroelectric ceramics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, large amount of high power devices working in a small space will induce local high temperature, which degrades the performance of electronic devices and may even lead to complete failure.…”

Section: Introductionmentioning

confidence: 99%

Effect of donor doping in B sites on the electrocaloric effect of BaTi_1−xNb_xO₃ ceramics

Bai

Han

2015

RSC Adv.

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This paper demonstrates the effect of donor doping in B sites on the electrocaloric effect (ECE) in BaTi 1-x Nb x O 3 (x=0~0.01) ferroelectric ceramics. The Nb substitution on Ti does not affect the formation of perovskite structure, while it obviously inhabits the grain growth in sintering process. The donor doping of Nb controls the ferroelectric phase transition more efficiently than the equivalent substitutions either in A or B sites. It lowers the phase transition temperature aboutone order of magnitude faster than the equivalent substitution, so that the ECE ∆ ∆ ∆ ∆T max shifts accordingly. Nb doping also diffuses the phase transition, so that the ECE ∆ ∆ ∆ ∆T max reduces and the peak becomes much wider. Compared with BaTiO 3 , ∆ ∆ ∆ ∆T max of BaTi 0.994 Nb 0.006 O 3 drops one third, while the full width at half maximum increases twice, indicating a better refrigeration capacity. a Corresponding author. 3 high ∆T at morphotropic phase boundary [14,15]. In addition, the co-substitution of Ca 2+ on Ba 2+ and Zr 4+ on Ti 4+ was also studied [16-21]. Up to now, all reports focused on the effect of various equivalent dopings but the inequivalent doping has not been researched for ECE, although the inequivalent dopings were reported to improve the dielectric and piezoelectric properties more efficiently [22,23]. The donor doping of Nb 5+ on Ti 4+ in B sites, a typical soft doping, has a notable effect on modifying the ferroelectric phase transition. This paper reports its effects on the phase composition, microstructure, dielectric, ferroelectric and electrocaloric effects of BaTiO 3 ceramics,and a better refrigeration capacity is obtained. Experimental procedure Sample preparationThe BaTi 1-x Nb x O 3 (x=0~0.01) ceramics were prepared by the conventional solid-state reaction method. Analytical reagent grade BaCO 3 , TiO 2 and Nb 2 O 5 were used as raw materials. After the mixed powders were calcined at 1000 °C, they were grinded by planetary ball mill. The resultant powders were dry-pressed in a stainless-steel die under a pressure of 3 MPa and the pressed pellets were sintered at 1350 °C for 4 hours in air. CharacterizationThe phase composition of calcined powders were characterized by X-ray diffraction (XRD) using Cu K α radiation (λ=0.15418 nm) with a scanning rate of 2 °/min. The microstructure of the sintered samples was observed by scanning electron (Figure 2(a)), Nb doped samples exhibit obviously small grain size, less than 1µm, which further decreases with increasing Nb amount (Figure 2 (b)~(d)). It is because the donor doping of Nb accumulates at grain boundaries, which hinders the motion of grain boundaries during the sintering process. The densities of all sintered samples are larger than 5.92 g/cm 3 , i.e. 98% of theoretical density, which well agrees with the SEM observations. Thermal analysisThe thermal characters of tetragonal-cubic (T-C) phase transition are shown in the heat flow curves in Figure 3. With the rise of Nb amount, the endothermic peak gradually moves to lower temperature, indicatin...

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Electro-caloric effect in (Ba1−xCax)(Zr0.05Ti0.95)O3: A lead-free ferroelectric material

Cited by 98 publications

References 29 publications

Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Ceramics

Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Ceramics

Lead-free Ba0.8Ca0.2(ZrxTi1−x)O3 ceramics with large electrocaloric effect

Effect of donor doping in B sites on the electrocaloric effect of BaTi_1−xNb_xO₃ ceramics

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Electro-caloric effect in (Ba1−xCax)(Zr0.05Ti0.95)O3: A lead-free ferroelectric material

Cited by 98 publications

References 29 publications

Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba0.85Ca0.15Ti0.9Zr0.1O3 Ceramics

Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba0.85Ca0.15Ti0.9Zr0.1O3 Ceramics

Lead-free Ba0.8Ca0.2(ZrxTi1−x)O3 ceramics with large electrocaloric effect

Effect of donor doping in B sites on the electrocaloric effect of BaTi1−xNbxO3 ceramics

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Product

Resources

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Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Ceramics

Electrocaloric Behavior and Temperature‐Dependent Scaling of Dynamic Hysteresis of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Ceramics

Effect of donor doping in B sites on the electrocaloric effect of BaTi_1−xNb_xO₃ ceramics