Temperature-dependent Raman spectroscopy, domain morphology and photoluminescence studies in lead-free BCZT ceramic

Coondoo, Indrani; Panwar, Neeraj; Krylova, S. N.; Крылов, А. С.; Аликин, Д. О.; Jakka, Suresh Kumar; Турыгин, А. П.; Shur, V. Ya.; Kholkin, A. L.

doi:10.1016/j.ceramint.2020.09.137

Cited by 32 publications

(8 citation statements)

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“…Despite this, in situ transmission electron microscopy studies have shown an interesting single domain state during electrical loading [54], which suggests a transformation from a multiphase state to a purely orthorhombic phase. Similarly, in situ temperature-dependent PFM and Raman spectroscopy revealed the existence of a complex orthorhombic/ rhombohedral nano-domains in a tetragonal matrix at room temperature [55]. Although the mechanism responsible for this mechanical behavior has not been directly observed through, e.g., in situ stress-dependent X-ray diffraction, the hysteretic mechanical response is understood to be primarily due to ferroelastic domain wall nucleation and growth as well as the influence of the multiphase state at room temperature in the vicinity of the polymorphic phase boundary [49,52].…”

Section: Graphical Abstract Introductionmentioning

confidence: 92%

“…S1, S2, and S3). At high temperatures ([ 110 °C), it is clear that the Raman spectra show only two main broad vibrations centered at *228 cm -1 and *520 cm -1 , typical features of the paraelectric cubic phase [55,79,105].…”

Section: Stress-and Temperature-dependent Raman Spectroscopymentioning

confidence: 99%

“…This procedure should allow following the variations of the band relative intensities, width, and frequency positions, e.g., with change Normalised Intensity (a.u.) in temperature [55]. However, the overlap of a large number of broad bands associated with the perovskite vibrations requires many assumptions on bandwidth and intensity/frequency variations, especially when changing temperature and phase.…”

Section: Stress-and Temperature-dependent Raman Spectroscopymentioning

confidence: 99%

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Influence of stress on the electromechanical properties and the phase transitions of lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3

et al. 2022

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The influence of stress on the phase boundaries of polycrystalline lead-free perovskite (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 (x = 0.4, 0.5, and 0.6) was characterized through the temperature- and stress-dependent small-signal dielectric and piezoelectric response from − 150 to 200 °C under uniaxial compressive stress up to − 75 MPa. For all three compositions, the phase transition temperatures separating the rhombohedral, orthorhombic, tetragonal, and cubic phases were shifted to higher temperatures with an increase in the uniaxial mechanical loading, corresponding to a significant decrease in the dielectric and piezoelectric responses. Additional stress-dependent relative permittivity measurements up to − 260 MPa were conducted at four different constant temperatures (− 10, 10, 25, and 40 °C), revealing significant increases in the dielectric response, making these materials interesting for tunable dielectric applications. Furthermore, the stress-induced shift in phase transition temperatures was confirmed by in situ combined temperature- and stress-dependent Raman spectroscopy measurements under different constant uniaxial loads within the temperature range from 30 to 130 °C. Graphical abstract

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Section: Graphical Abstract Introductionmentioning

confidence: 92%

Section: Stress-and Temperature-dependent Raman Spectroscopymentioning

confidence: 99%

Section: Stress-and Temperature-dependent Raman Spectroscopymentioning

confidence: 99%

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Influence of stress on the electromechanical properties and the phase transitions of lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3

et al. 2022

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“…26 variation of (G) ε', (H) tan δ, and (I) ac conductivity with variation of GO/rGO concentration; (J) schematic of GO/rGO sheets and BZT-BCT particles in PVDF matrix and formation of conductive path at higher concentrations ceramic. 47 When GO or rGO are introduced, conductivity increases with GO/rGO content increment. The rate of conductivity increases with respect to GO/rGO content is higher in the case of rGO composites than GO composites (Figure 4I).…”

Section: Synthesis Of Pvdf-(bzt-bct)-go/rgo Composite Filmsmentioning

confidence: 99%

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Muduli

Parida

Behura

et al. 2022

Polymers for Advanced Techs

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Piezoelectric energy harvester has attracted considerable attention as an independent power source for applications in biocompatible, implantable, and flexible electronic devices. However, the lacuna of getting enhanced piezoelectric response from flexible lead‐free polymer‐based composite persists in this field. Here, we present a detailed study on the electrical characteristics such as dielectric, ferroelectric, and piezoelectric properties of (PVDF)‐[0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3]‐graphene oxide (GO) three‐phase composite films synthesized by solvent‐casting followed by a hot pressing method. Structural investigations reveal that the fraction of β‐phase of PVDF in all the composites is more than 65%. The dielectric constant of the composite increases up to the threshold value (0.16 wt% for GO and 0.08 wt% for rGO), and further loading causes a decrease in the dielectric constant. The composite with GO concentration of 0.16 wt% (G‐0.16) shows a dielectric constant of 25.6 with a loss tangent of 0.0498. In contrast, composite with reduced graphene oxide (rGO) concentration of 0.08 wt% (R‐0.08) are 24.3 and 0.0681, respectively, at 1 kHz. Remnant polarization and d33 value of G‐0.16 are 0.012 μC cm−2 and 11 pC N−1, respectively, which are six times and four times more than pure PVDF. The piezoelectric harvester from G‐0.16 produces an open‐circuit voltage of ~4 V and a short‐circuit current of ~1.6 μA with simple hand tapping, which is the highest among the compositions, makes it a suitable candidate for piezoelectric energy harvesting applications.

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“…The reasons are as follows. The Ca addition at 5 at.% is to ensure a reversible tetragonal (ferroelectric) to cubic (paraelectric) transformation below 120 • C, according to the phase diagrams [38,39]. Preliminary studies [25,35,40] have shown that the addition of Zr increases the polarization jump across the phase transformation, potentially boosting the FOM.…”

Section: Materials Developmentmentioning

confidence: 99%

Energy Conversion from Heat to Electricity by Highly Reversible Phase-Transforming Ferroelectrics

et al. 2021

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The search for performant multiferroic materials has attracted general research interest in energy science as they have been increasingly exploited as the conversion media among thermal, electric, magnetic, and mechanical energies by using their temperature-dependent ferroic properties. Here we report a material development strategy that guides us to discover a reversible phase-transforming ferroelectric material exhibiting enduring energy harvesting from small temperature differences. The material satisfies the crystallographic compatibility condition between polar and nonpolar phases, which shows only 2.5 • Cthermal hysteresis and a high figure of merit. It stably generates 15 μA of electricity in consecutive thermodynamic cycles in the absence of any bias fields. We demonstrate our device to consistently generate 6 μA/cm 2 current density near 100 • C over 540 complete phase transformation cycles without any electric and functional degradation. The energy-conversion device can light up an LED directly without attaching an external power source. This promising material candidate brings the low-grade waste-heat harvesting closer to a practical realization, e.g., small temperature fluctuations around the water boiling point can be considered as a clean energy source.

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Temperature-dependent Raman spectroscopy, domain morphology and photoluminescence studies in lead-free BCZT ceramic

Cited by 32 publications

References 60 publications

Influence of stress on the electromechanical properties and the phase transitions of lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3

Influence of stress on the electromechanical properties and the phase transitions of lead-free (1 − x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Energy Conversion from Heat to Electricity by Highly Reversible Phase-Transforming Ferroelectrics

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