Potentiality of Bi and Mn co-doped lead-free NaNbO3 ceramics as a pyroelectric material for uncooled infrared thermal detectors

Zhou, Mingxing; Liang, Ruihong; Zhou, Zhiyong; Dong, Xianlin

doi:10.1016/j.jeurceramsoc.2019.01.035

Cited by 31 publications

(41 citation statements)

References 33 publications

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“…Figure 8 exhibits the variation of p with temperature for KNN-xBNZ ceramics with varying BNZ content. 28,[54][55][56][57] The p value of other components at T C is 166.51 × 10 -4 , 49.67 × 10 -4 and 9.2 × 10 -4 C m -2 K -1 for x = 0.04, 0.05 and 0.06, respectively. A single peak is observed near T C for all samples in the whole studied temperature range, meanwhile the maximum value of p decreases significantly with appropriate BNZ addition just like the dotted blue line in graph.…”

Section: Resultsmentioning

confidence: 99%

“…This large p is much higher than the reported results in KNN-based ceramics, 30,52,53 which can be even comparable to that of lead-free or lead-based ceramics. 28,[54][55][56][57] The p value of other components at T C is 166.51 × 10 -4 , 49.67 × 10 -4 and 9.2 × 10 -4 C m -2 K -1 for x = 0.04, 0.05 and 0.06, respectively. The decrease of p significantly is closely related to the change of grain size.…”

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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“…Other experimental details not mentioned in this study can be found in our previous published papers. 32,37,38 3 | RESULTS AND DISCUSSION…”

Section: Methodsmentioning

confidence: 99%

“…However, pyroelectric properties of NaNbO 3 ceramics have rarely been investigated and their research is still on the primary stage. In our recent study, relatively high p of 1.85 × 10 −8 C cm −2 K −1 was obtained in Bi/Mn co‐doped NaNbO 3 ceramics . However, compared to PZT‐based and BNT‐based pyroelectric materials, the pyroelectric performance of the NaNbO 3 ceramics still needs further improvement.…”

Section: Introductionmentioning

confidence: 92%

“…The definitions of p and FOMs are given by: 47,48 (1) p = I (T) A × (dT∕dt) where I(T), dT/dt, A, tanδ, ε r , ε 0 , and C v , represent the pyroelectric current, heating rate (2 K min −1 ), sample's electrode area, dielectric loss, relative dielectric constant, permittivity of free space (8.85 × 10 −12 F m −1 ), and specific heat capacity (~3.0 J cm −3 K −1 ), respectively. 32,49 According to the abovementioned equations, the value of pyroelectric coefficient depends only on the pyroelectric current. However, the values of the F d , F v , and F i are related to the C v , ε r , and tanδ as well.…”

Section: Piezoelectric Characteristics and Depolarization Performancementioning

confidence: 99%

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Significantly enhanced pyroelectric performance in novel sodium niobate‐based lead‐free ceramics by compositional tuning

et al. 2019

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In this study, (1 − x)NaNbO3–xBa0.6(Bi0.5K0.5)0.4TiO3 (abbreviated as NN‐xBBKT, x = 0.05, 0.10, 0.15, and 0.20) lead‐free pyroelectric ceramics were synthesized by conventional solid‐state reaction method. Moreover, their microstructure, phase structure, dielectric, ferroelectric, piezoelectric, and pyroelectric characteristics were studied systematically. The X‐ray diffraction result showed that the phase structure of NN‐xBBKT ceramics changed from orthorhombic to tetragonal and finally became pseudocubic symmetry. The ferroelectric‐paraelectric phase transition temperature and depolarization temperature shifted to lower temperature with the increase in BBKT content. Furthermore, with increasing BBKT content, piezoelectric coefficient, figures of merit, and pyroelectric coefficient first increased and then decreased. The optimum pyroelectric properties (eg Fd = 0.81 × 10−5 Pa−1/2, Fv = 1.02 × 10−2 m2 C−1, Fi = 1.04 × 10−10 m V−1, and p = 3.11 × 10−8 C cm−2 K−1) were observed in sample composition with x = 0.15. More importantly, the pyroelectric coefficient of ceramic with x = 0.15 also displayed relatively high thermal stability because of high depolarization temperature (~110°C). These parameters demonstrate that the novel Pb‐free NaNbO3‐based ceramics form an important class of pyroelectric material with broad range of application prospect.

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Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

Raevskaya

Malitskaya

Chou

et al. 2019

Physica Status Solidi (a)

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For sodium niobate (NaNbO 3 ) ceramics containing in the nonpoled state about 30% of the ferroelectric Q phase, the temperature dependences of the dielectric constant ε and pyroelectric coefficient p are studied. The results obtained show that the transition from the Q phase into the high-temperature nonpolar phase seems to be a diffuse one and the remanent polarization remains nonzero up to %370 C, i.e., well above the temperature of the p(T ) maximum (%270 C). Poled NaNbO 3 ceramics possess high figures of merit for pyroelectric sensors and NaNbO 3 -based materials are prospective for application in the noncooled infrared detectors.

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Potentiality of Bi and Mn co-doped lead-free NaNbO3 ceramics as a pyroelectric material for uncooled infrared thermal detectors

Cited by 31 publications

References 33 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

Significantly enhanced pyroelectric performance in novel sodium niobate‐based lead‐free ceramics by compositional tuning

Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

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Potentiality of Bi and Mn co-doped lead-free NaNbO3 ceramics as a pyroelectric material for uncooled infrared thermal detectors

Cited by 31 publications

References 33 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

Significantly enhanced pyroelectric performance in novel sodium niobate‐based lead‐free ceramics by compositional tuning

Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

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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