Large pyroelectric properties at reduced depolarization temperature in A-site nonstoichiometry composition of lead-free 0.94Na
                x
            Bi
                y
            TiO3–0.06Ba
                z
            TiO3 ceramics

Balakt, Ahmed M.; Shaw, Christopher P.; Zhang, Qi

doi:10.1007/s10853-017-0973-1

Cited by 20 publications

(7 citation statements)

References 47 publications

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“…), and energy harvesting efficiency (F e = p 2 /ε r ε 0 ), where C v denotes the volume heat capacity, ε 0 denotes the vacuum permittivity (ε 0 = 8.854 × 10 −12 F/m), ε r denotes the relative permittivity, and tan δ denotes the dielectric loss. 8,44,45 7E, the room-temperature pyroelectric coefficient of x = 0.05 is the largest among the reported niobatebased ceramics. In addition, the FOMs of x = 0.05 are also comparable or higher than those of several lead-free and lead-based ceramic materials.…”

Section: Resultsmentioning

confidence: 93%

“…In addition to the pyroelectric coefficient, FOMs were used to evaluate the pyroelectric properties of ferroelectric materials. FOMs include the current detectivity ( F i = p / C v ), voltage detectivity ( F v = p / C v ε r ε 0 ), detectivity ( F d = p / C v ( ε r ε 0 tan δ ) 1/2 ), and energy harvesting efficiency ( F e = p 2 / ε r ε 0 ), where C v denotes the volume heat capacity, ε 0 denotes the vacuum permittivity ( ε 0 = 8.854 × 10 −12 F/m), ε r denotes the relative permittivity, and tan δ denotes the dielectric loss 8,44,45 . F i , F v , and F d are used in charging the fast pulse, large area, and pyroelectric point detectors, respectively 44 .…”

Section: Resultsmentioning

confidence: 99%

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Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

et al. 2022

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Achieving excellent pyroelectric performance remains a challenge for lead‐free piezoelectric ceramics. To meet the requirements of both an enhanced pyroelectric coefficient at room temperature and good thermal stability during the encapsulation of pyroelectric devices, (1–x)K0.48Na0.52NbO3–xBi0.5Ag0.5ZrO3–0.2%Fe2O3 (KNN–BAZ–Fe) lead‐free ferroelectric ceramics with high Curie temperatures were prepared to obtain improved pyroelectric performance via the coexistence of multiple symmetries. The variation of BAZ content led to the formation of rhombohedral–orthorhombic–tetragonal phase boundary and promoted grain growth, resulting in the best pyroelectric coefficient (p = 5.09 × 10−4 C m−2°C−1) and enhanced figures of merit (Fi = 0.2084 × 10−9 (m V−1), Fv = 0.0142 m2 C−1, Fd = 0.0947 × 10−4 Pa−1/2, and Fe = 17.66 J m−3 K−2) for infrared (IR) detection when x = 0.05. The room‐temperature pyroelectric coefficient obtained in this study is approximately four times that of the pure KNN ceramic and is the maximum value reported for niobate‐based piezoelectric ceramics. Moreover, compared with the poor thermal stability of barium titanate‐ and bismuth sodium titanate‐based ceramics because of their ultralow Curie temperature or thermal depolarization temperature, the ceramics investigated here exhibit much better thermal stability because of their high Curie temperature (TC > 300°C) and diffused phase‐transition behavior, making them more adaptable for practical applications. These results suggest that KNN–xBAZ–Fe ceramics are attractive candidates for applications in the field of IR sensors.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

et al. 2022

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“…Abe et al investigated MnO 2 -doped NBT-6BT and reported p = 3.5 × 10 −4 C m −2 K −1 at room temperature [ 23 ]. Recently, Balakat et al have been extensively investigating the pyroelectric properties of 0.94Na x Bi y TiO 3 -0.06Ba z TiO 3 [ 24 ], 0.94Na 1/2 Bi 1/2 TiO 3 -0.06Ba 1+x TiO 3 [ 25 ], La-doped NBT-6BT [ 26 ], Ta-doped NBT-6BT [ 27 ], and La, Ta-doped NBT-6BT [ 28 ]. The depolarization temperature (T d ) is lowered using these doping strategies; however, only a small improvement was observed in the pyroelectric figures of merit (FOMs).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Pyroelectric Performance of Lead-Free Zn-Doped Na1/2Bi1/2TiO3-BaTiO3 Ceramics

2021

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Lead-free Na1/2Bi1/2TiO3-BaTiO3 (NBT-BT) has gained revived interest due to its exceptionally good high power properties in comparison to commercial lead-based piezoelectrics. Recently, Zn-modified NBT-BT-based materials as solid solution and composites have been reported to exhibit enhanced depolarization temperatures and a high mechanical quality factor. In this work, the pyroelectric properties of Zn-doped NBT-6mole%BT and NBT-9mole%BT ceramics are investigated. The doped compositions of NBT-6BT and NBT-9BT feature a relatively stable pyroelectric property in a wide temperature range of ~37 K (300–330 K) and 80 K (300–380 K), respectively. A threefold increase in detector figure of merit is noted for 0.01 mole Zn-doped NBT-6mole% BT at room temperature in comparison to undoped NBT-6mole%BT and this increase is higher than those of major lead-free materials. A broad range of the temperature-independent behavior for the figures of merit was noted (303–380 K) for Zn-doped NBT-6mole% BT, which is 30 K higher than the undoped material. The large pyroelectric figures of merit and good temperature stability renders Zn-doped NBT-BT an ideal candidate for pyroelectric detector and energy harvesting applications.

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“…(1− x )BNT– x Ba(Zr,Ti)O 3 system with x = 0.06‐0.07 near MPB was reported to exhibit large p of 5.7 × 10 −8 Ccm −2 K −1 . Moreover, the p of BNT–BT ceramics can be significantly enhanced from 3.15 × 10 −8 to 6.99 × 10 −8 Ccm −2 K −1 through a modulation of Na + /Bi 3+ molar ratio . Doping with elements such as Ba, Mn, and La is another effective way to improve the pyroelectric properties.…”

Section: Introductionmentioning

confidence: 99%

“…23 Moreover, the p of BNT-BT ceramics can be significantly enhanced from 3.15 9 10 À8 to 6.99 9 10 À8 Ccm À2 K À1 through a modulation of Na + /Bi 3+ molar ratio. 24 Doping with elements such as Ba, 25 Mn, 26 and La 27 is another effective way to improve the pyroelectric properties. Recently, a rather high p of 7.42 9 10 À8 Ccm À2 K À1 in BNT-BT ceramics was achieved by Balakt et al through La doping.…”

Section: Introductionmentioning

confidence: 99%

Enhanced pyroelectric properties in (Bi_0.5Na_0.5)TiO₃–BiAlO₃–NaNbO₃ ternary system lead‐free ceramics

et al. 2018

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High pyroelectric performance and good thermal stability of pyroelectric materials are desirable for the application of infrared thermal detectors. In this work, enhanced pyroelectric properties were achieved in a new ternary (1−x)(0.98(Bi0.5Na0.5)(Ti0.995Mn0.005)O3–0.02BiAlO3)–xNaNbO3 (BNT–BA–xNN) lead‐free ceramics. The effect of NN addition on the microstructure, phase transition, ferroelectric, and pyroelectric properties of BNT–BA–xNN ceramics were investigated. It was found that the average grain size decreased as x increased to 0.03, whereas increased with further NN addition. The pyroelectric coefficient p at room temperature (RT) was significantly increased from 3.87 × 10−8Ccm−2K−1 at x = 0 to 8.45 × 10−8Ccm−2K−1 at x = 0.03. The figures of merit (FOMs), Fi, Fv and Fd, were also enhanced with addition of NN. Because of high p (7.48 × 10−8Ccm−2K−1) as well as relatively low dielectric permittivity (~370) and low dielectric loss (~0.011), the optimal FOMs at RT were obtained at x = 0.02 with Fi = 2.66 × 10−10 m/V, Fv = 8.07 × 10−2 m2/C, and Fd = 4.22 × 10−5 Pa−1/2, which are superior to other reported lead‐free ceramics. Furthermore, the compositions with x ≤ 0.03 exhibited excellent temperature stability in a wide temperature range from 20 to 80°C because of high depolarization temperature (≥110°C). Those results unveil the potential of BNT–BA–xNN ceramics for infrared detector applications.

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Large pyroelectric properties at reduced depolarization temperature in A-site nonstoichiometry composition of lead-free 0.94Na x Bi y TiO3–0.06Ba z TiO3 ceramics

Cited by 20 publications

References 47 publications

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

Enhanced Pyroelectric Performance of Lead-Free Zn-Doped Na1/2Bi1/2TiO3-BaTiO3 Ceramics

Enhanced pyroelectric properties in (Bi_0.5Na_0.5)TiO₃–BiAlO₃–NaNbO₃ ternary system lead‐free ceramics

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Large pyroelectric properties at reduced depolarization temperature in A-site nonstoichiometry composition of lead-free 0.94Na x Bi y TiO3–0.06Ba z TiO3 ceramics

Cited by 20 publications

References 47 publications

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

Enhanced pyroelectric performance in potassium sodium niobate‐based ceramics via multisymmetries coexistence design

Enhanced Pyroelectric Performance of Lead-Free Zn-Doped Na1/2Bi1/2TiO3-BaTiO3 Ceramics

Enhanced pyroelectric properties in (Bi0.5Na0.5)TiO3–BiAlO3–NaNbO3 ternary system lead‐free ceramics

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Enhanced pyroelectric properties in (Bi_0.5Na_0.5)TiO₃–BiAlO₃–NaNbO₃ ternary system lead‐free ceramics