Composition-dependent xBa(Zr0.2Ti0.8)O3-(1-x)(Ba0.7Ca0.3)TiO3 bulk ceramics for high energy storage applications

Jayakrishnan, A. R.; Alex, Kevin V.; Thomas, Athul; Silva, José; Kamakshi, Koppole; Dabra, Navneet; Sekhar, K. C.; Moreira, J. Agostinho; Gomes, M. J. M.

doi:10.1016/j.ceramint.2018.11.250

Cited by 69 publications

(41 citation statements)

References 50 publications

(67 reference statements)

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“…where ‘f’ is the frequency of the normal mode, ‘k’ is the force constant, and ‘m’ is the reduced atomic mass of the elements involved in the vibration . The E 2 (high) mode related to Zn−O bond shift towards lower frequency as x increases from 0 to 0.2.…”

Section: Resultsmentioning

confidence: 75%

Barium‐Doped Zinc Oxide Thin Films as Highly Efficient and Reusable Photocatalysts

et al. 2020

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In this study, the effect of Ba doping content on the photocatalytic activity of (Zn1‐xBaxO (ZBO); x=0 to 0.2) thin films is investigated. The efficiency of ZBO photocatalyst for the decolorization of Rhodamine B (RhB) is found to be optimum at x=0.1. The Zn0.9Ba0.1O film exhibits an efficiency of ≈ 96% at an irradiation time of 60 min. The high photocatalytic activity of Ba doped ZnO films is attributed to the high efficient generation and separation of photo‐induced charge carriers as evident from photocurrent measurements. Further, the texture and the oxygen vacancies favor the photocatalytic activity as suggested by the x‐ray diffraction (XRD), scanning electron microscope (SEM), x‐ray photoelectron spectroscopy (XPS), Raman spectroscopy and photoluminescence (PL) analysis. Moreover, the reusability test reveals that the photocatalyst performance remains for at least six consecutive cycles without significant change. The higher efficiency and outstanding reusability of Zn0.9Ba0.1O make it a potential candidate for photocatalytic applications.

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Section: Resultsmentioning

confidence: 75%

Barium‐Doped Zinc Oxide Thin Films as Highly Efficient and Reusable Photocatalysts

et al. 2020

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“…It suggested the existence of diffused phase transition (DPT) between the intermediate orthorhombic and tetragonal structural phases. [17] According to Devonshire's theory, the structural bridge between the rhombohedral (R) and tetragonal (T) phase may be considered as some other low symmetric monoclinic phases M C or M A , favored by certain polarization path. [49,50] However, the Rietveld refinement of XRD data of assynthesized BCZT powder (as explained in the earlier section) approximated the co-existence of orthorhombic and tetragonal structural phase in BCZT powder.…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Among the various leadfree inorganic particles, calcium and zirconium doped barium titanate (BCZT) has been widely explored for its relaxor-type ferroelectric properties. [17][18][19][20][21] The high curie temperature (T c ), a high relative permittivity with low loss, good polarization, and large recoverable energy density in BCZT ceramics are good for their use in energy storage capacitors. [17] The BCZT ceramics also showed a large piezoelectric effect in one of its compositions.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20][21] The high curie temperature (T c ), a high relative permittivity with low loss, good polarization, and large recoverable energy density in BCZT ceramics are good for their use in energy storage capacitors. [17] The BCZT ceramics also showed a large piezoelectric effect in one of its compositions. [22] The Ca + /Ba + and Zr + /Ti + ratios in BCZT affects the morphotropic phase boundary (MPB) formation.…”

Section: Introductionmentioning

confidence: 99%

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Modulation in polymer properties in PVDF/BCZT composites with ceramic content and their energy density capabilities

et al. 2020

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The lead-free 0.5((Ba 0.7 Ca 0.3)TiO 3)-0.5(Ba(Zr 0.2 Ti 0.8))O 3 (BCZT) piezoceramics were synthesized using sol-gel method. The Rietveld analysis of X-ray diffraction (XRD) data and differential scanning calorimetry (DSC) studies of as-synthesized BCZT powder suggests the coexistence of ferroelectric orthorhombic (O) and tetragonal (T) phases at room temperature (RT). The value of curie temperature (T T-C) as depicted from DSC and dielectric studies was found to be ≈ 110 C. The BCZT ceramic particles were dispersed in the polyvinylidene fluoride (PVDF) matrix, an electroactive polymer with great ferro/piezoelectric response in its distinct β and γ phases, to form ferroelectric ceramic-polymer composites for their applications in flexible energy storage capacitors. The present work reports the Fourier-transform infrared spectroscopy (FTIR), XRD, dielectric, ferroelectric, and energy density properties of PVDF/BCZT composite films having different wt% of BCZT content fabricated by the solution-cast technique. The FTIR and XRD studies depict the γ-PVDF and pure BCZT phases in composite films. The dielectric studies estimated the relative permittivity (ε r) of a composite film with 50 wt% of BCZT content to be ≈ 31 (at 120 Hz) which was about three times as compared with that of pure PVDF. The dielectric loss (tan δ) was maximum ≈ 0.15 (at 120 Hz) for 50 wt % BCZT composition. The ferroelectric studies and energy storage calculations showed that the value of remnant polarization (P r), coercive field (E c) and energy storage density (W) attain the maximum value of 0.63 μC/cm 2 , 35.22 kV/cm, and 70.46 mJ/cm 3 , respectively for the film sample having 40 wt% BCZT content. The maximum energy storage efficiency, η (%) is calculated to be ≈ 60 for 50 wt% BCZT composition. The results indicated that the incorporation of BCZT particles

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“…Clearly, T o are about 483.15 K and 421.15 K respectively for PLZT and PLHT ceramics. Besides dielectric behaviors of relaxer ferroelectrics usually deviate from the typical Curie-Weiss behavior, as a result, dielectric relaxer characteristics can be described by a modi ed Curie-Weiss relationship [17,18]: 1/ γ -1/ m =(T-T m ) γ /C 1 , (1≤γ≤2), where γ and C 1 are constant. The character of phase transitions can be revealed by parameter γ.…”

Section: Dielectric Characteristic Was Conducted By An Impedance Analmentioning

confidence: 99%

High Efficiency Refrigeration and Pyroelectric Energy Harvesting Applications of Lead Titanate Based Relaxer Ceramic

Zhang

Huang

et al. 2020

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Relaxer ferroelectrics are highly attractive in electrocaloric due to large breakdown electric field and wide phase transition temperatures, which has great potential applications in solid-state cooling. In this work, relaxer ferroelectrics are synthesized by a traditional solid state reaction method. Phase transition and relaxer characteristics are studied by temperature dependent dielectric spectrums. Temperature dependent ferroelectric properties are also studied to calculate electrocaloric effect. Maximum value of refrigeration efficiency η ( ΔT/ΔE ) is about 0.079 K·cm/kV, our result lays a foundation and provides a reference for studying high efficiency solid-state electrocaloric refrigeration. Pyroelectric energy harvesting are studied, maximum pyroelectric energy harvesting is 279 kJ/cm 3 .

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Composition-dependent xBa(Zr0.2Ti0.8)O3-(1-x)(Ba0.7Ca0.3)TiO3 bulk ceramics for high energy storage applications

Abstract: Composition-dependent xBa(Zr 0.2 Ti 0.8)O 3-(1-x) (Ba 0.7 Ca 0.3)TiO 3 bulk ceramics for high energy storage applications, Ceramics International,

Cited by 69 publications

References 50 publications

Barium‐Doped Zinc Oxide Thin Films as Highly Efficient and Reusable Photocatalysts

Barium‐Doped Zinc Oxide Thin Films as Highly Efficient and Reusable Photocatalysts

Modulation in polymer properties in PVDF/BCZT composites with ceramic content and their energy density capabilities

High Efficiency Refrigeration and Pyroelectric Energy Harvesting Applications of Lead Titanate Based Relaxer Ceramic

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