Enhanced pyroelectric figure of merits of porous BaSn0.05Ti0.95O3 ceramics

Srikanth, K. S.; Singh, V. P.; Vaish, Rahul

doi:10.1016/j.jeurceramsoc.2017.05.015

Cited by 49 publications

(14 citation statements)

References 35 publications

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“…The relative permittivity decreases with increasing material porosity as reported by other workers [38]. Porosity of a ceramic material is a serious defect in high-voltage insulating systems [39]. Enhanced electric field in the pores increases the probability of bond breakage on the pore walls and leads to the lowering of the overall breakdown strength [40].…”

Section: Effect Of Porosity On Dielectric Propertiessupporting

confidence: 51%

Physical Properties of Porous Pure and Zr/Sn-Doped Nanocrystalline BaTiO3 Ceramics

Ahmadu¹,

Muazu²,

Umar³

2018

Recent Advances in Porous Ceramics

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Polycrystalline BaTiO 3 and Ba(Ti 0.96 SnxZr 0.04-x )O 3 ceramics (x = 0.02-0.04) were prepared by a combination of solid-state and mechanochemical process and characterized at room temperature by X-ray diffraction for phase composition. Their crystal structures were found to be of the cubic and tetragonal symmetries, respectively. The grain size and porosity which were determined using Field Emission Scanning Electron Microscope (FESEM) and densitometer, respectively showed decrease and increase of relative density respectively, with increase in doping concentration. The variations of dielectric constant and loss with frequency and temperature show a maximum dielectric constant of 1660 at room temperature for Ba(Ti 0.96 Sn 0.03 Zr 0.01 )O 3 . The remnant polarization (P r ) and coercive field (E c ) of BT were found to be 581.73 V/cm and 0.27 μC/cm 2 . Increase in Sn content led to an increase in Pr of 0.58, 3.07, 3.73 C/cm 2 , and Ec of 1766.8, 2855.7, 2661.1 V/cm, respectively and are expected to lead to a significant reduction in the thickness of the multilayer ceramic capacitors. Impedance spectroscopy of polycrystalline Ba (Ti 0.96 Sn 0.02 Zr 0.02 )O 3 in a wide frequency and temperature range showed Nyquist plots with presence of grain and grain boundary at 400 C and a negative temperature coefficient of resistance (NTCR) for Ba(Ti 0.96 Sn 0.02 Zr 0.02 )O 3 .The dielectric relaxation showed a non-Debye character.

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Section: Effect Of Porosity On Dielectric Propertiessupporting

confidence: 51%

Physical Properties of Porous Pure and Zr/Sn-Doped Nanocrystalline BaTiO3 Ceramics

Ahmadu¹,

Muazu²,

Umar³

2018

Recent Advances in Porous Ceramics

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“…reported drastic enhancement in pyroelectric signal after coating materials surfaces with graphene ink . A few studies attempted to increase the specific surface area by preparing porous structure of the materials, which was ultimately helpful for absorption of more thermal energy . Very recently, our group has also explored enhanced pyroelectric signals after tuning microstructure and composition .…”

Section: Introductionmentioning

confidence: 99%

Lead‐Free Pyroelectric Materials for Thermal Energy Harvesting: A Comparative Study

et al. 2018

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The thermal energy harvesting potential of different pyroelectric materials including Sr0.5Ba0.5Nb2O5 (SBN), [Bi0.48Na0.4032K0.0768] Sr0.04(Ti0.975Nb0.025)O3 (BNT‐Nb), Ba0.85Sr0.15Zr0.1Ti0.9O3 (BST‐BZT), Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCT‐BZT), and Ba0.9Ca0.1TiO3 (BCT) ceramics is compared. Amongst these materials, BCT is found to be best for pyroelectric energy harvesting. Open‐circuit voltages were found to be 1.7 V, 500 mV, 650 mV, 600 mV, and 400 mV for BCT, SBN, BCT‐BZT, BST‐BZT, and BNT‐Nb, respectively. BCT is further analyzed, revealing an optimum power output of 0.072 μW at the optimized cycle frequency (0.06 Hz) and at a load resistance of 18 MΩ. To improve the effectiveness of energy conversion from heat to electricity, the synchronized switch harvesting on inductor (SSHI) technique is experimentally tested on a BCT sample. It is revealed that this concept based on SSHI can significantly increase the amount of power extracted from pyroelectric materials. Compared with 0.072 μW across a standard circuit in a BCT sample, an enhanced power output of 0.16 μW and 0.14 μW is obtained using parallel and series SSHI, respectively at 0.06 Hz. The results reveal that the non‐linear processing technique based on SSHI leads to significant power improvement compared to non‐switched interface.

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“…In addition to this, materials should demonstrate temperature-independent pyroelectric performance. Hence, several methods are used to improve the FOMs, such as composite fabrication, porous ceramics and chemical modification [ 2 , 35 , 36 , 37 ]. However, researchers continue to explore new materials for efficient usage.…”

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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Enhanced pyroelectric figure of merits of porous BaSn0.05Ti0.95O3 ceramics

Cited by 49 publications

References 35 publications

Physical Properties of Porous Pure and Zr/Sn-Doped Nanocrystalline BaTiO3 Ceramics

Physical Properties of Porous Pure and Zr/Sn-Doped Nanocrystalline BaTiO3 Ceramics

Lead‐Free Pyroelectric Materials for Thermal Energy Harvesting: A Comparative Study

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

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