New insights into the effect of glass addition on the piezoelectric and thermal stability properties of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 Pb-free ceramic by defect engineering of MPB

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Lead-free (Na1-3xBix)(Nb0.75Ti0.25)O3 (x=0.0, 0.05, 0.1, 0.125 and 0.15) (NN-BT) ceramics were synthesized using solid-state reaction technique. Effect of Bi3+ into the crystal structure, dielectric, ferroelectric and energy storage properties of NNT ceramics were investigated. Pure NNT shown present perovskite structure with orthorhombic crystal structure at x ≤ 0.125, while Na3NbO8-NaNbO3 composite phase has been detected at x=0.15. The tolerance factor (τ) decreased from 0.97 (x=0.0) to 0.82 (0.15) which signified the composition deviated from perovskite structure at 0.15. Significant enhancement of dielectric constant at room temperature has been achieved by increasing Bi-content and the maximum value (~ 1500) obtained at 0.1. The largest value of maximum polarization (Pmax) and smallest value of remnant polarization (Pr) were achieved at x=0.1 due to orthorhombic NaNbO3 and rhombohedral (Na0.5Bi0.5)TiO3 coexistence phases. The substitution of monovalent (Na1+) by trivalent (Bi3+) lead to create sodium vacancies into the A-sites of NNT lattice subsequently increased the cations disorder and charge misfit. The maximum recoverable energy storage density (Wrec =17.5 J/cm3) and energy storage efficiency (ƞ =89 %) were achieved at x=0.1, Eb ~ 730kV/cm. Partially, (NNTB0.1) exhibit an outstanding stability of energy storage properties in terms of temperature range ( 25 to 150 °C) and frequency stability (2 – 20Hz). The present results imply the moderation ratio of Bi/Na play an important role for enhancement of energy storage properties of NaNbO3 anti-ferroelectric ceramics.

Section: Resultsmentioning

confidence: 94%

Section: Ferroelectric and Energy Storage Propertiesmentioning

confidence: 96%

Moderation of [Bi³⁺/Na¹⁺] molar ratio for enhancement of dielectric and energy storage properties of NaNbO₃ ceramics

Babeer,

Ezzeldien,

Ali

et al. 2024

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“…The Fourier transform infrared (FT-IR) analysis was used to investigate the effect of the doping element and to identify the change in local symmetry in the material. Furthermore, FT-IR absorption spectra provide a significant detail about the molecular vibrations and rotations associated with a covalent bond [32]. FT-IR spectra of sintered ceramics of NBT-BT doped ST at RT in the range of 400-1000 cm 1 are shown in figures 3(a)-(e).…”

Section: Infrared Characterizationmentioning

confidence: 99%

Simultaneously enhanced of energy storage and energy harvesting performances of [(Bi_0.5Na_0.5)TiO₃–BaTiO₃] ceramics by addition of SrTiO₃

Kamal,

Hussein,

Salem

et al. 2024

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As well known, the relaxor dielectric is characterized by high energy storage efficiency (ƞ), while high recoverable energy storage density (Wrec) can be achieved by anti-ferroelectric ceramics. Herein, our approach is to find a relaxor – anti-ferroelectric coexistence phases of (Bi0.5Na0.5)TiO3 – BaTiO3 ceramics for achieving high performance of energy storage and energy harvesting as well. Therefore, [(0.9-x)( Bi0.5Na0.5)TiO3 – xSrTiO3 – 0.1BaTiO3] (abbreviation ((0.9-x)BNT – x ST –0.1BT) (0.0 ≤ x ≤ 0.4) were synthesis via solid-state reaction route in air. The tolerance factor (τ) increased from 0.9901 to 0.9998 when ST-content increased from 0.0 to 0.4 indicate increase the crystal lattice symmetry. The FT-IR de-convolution vibration modes shown the TiO6 octahedra exhibit two peaks at ~ 550 and 650 cm-1 indicate present coexistence phases of crystal structure. Ferroelectric to relaxor phase crossover has been detected by addition of ST with present anti-ferroelectric phase in particular dopant of ST = 0.2. The increasing into the diffused phase transition (γ) is signified to enhancement the relaxor degree of BNT-BT at high content of ST. The rapidly suppression of remnant polarization (Pr) at high content of ST due to substitute iso-valence (Sr2+) by tri-valence (Bi3+) and mono-valence (Na1+). Ultrahigh Wrec = 1.13 J/cm3 with excellent ƞ = 92.62% were obtained at ST=0.3 at low electric field (E=110 kV/cm). Remarkable response of strain with high converse piezoelectric coefficient (d33* = 390.47pm/V) at ST=0.2 was obtained due to decreasing the non-revisable 180o domain switching. Based on the obtained results, the addition of ST into BNT-BT ceramics can provide a head start in the implementation of ceramic capacitors for potential effective into energy harvesting and energy storage applications.

“…But it's well known that lead-based ceramics have more than 70% of PbO as a toxic and harmful material in practical applications [18]. Pure ferroelectric BaTiO 3 ceramic is used in several applications, such as memory devices, multilayer capacitors, piezoelectric sensors, and non-linear optic devices [19]. The high remnant polarization, the large grain boundary, and the low DBSs hinder the enhancement of ESPs [20].…”

Section: Introductionmentioning

confidence: 99%

A/B-sites disorder-induced relaxor phase transition and inhibit the grain size of BaTiO₃ ceramic to enhance energy storage properties

Babeer,

Mahmoud,

Ezzeldien

2024

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The present study introduces a strategy for improving the energy storage performance (ESPs) and enhancing the dielectric breakdown strength (DBSs) of BaTiO3 (BT) via breaking the domain structure caused by A/B –sites cations disorder. Lead-free [(Ba0.85Bi0.06Mg0.06)(Ti1-xZrx)O3] (abbreviate BT-BMZ) (x = 0.0, 0.025, 0.05, and 0.075) ceramics were used in this study. The substitution of isovalent (Ba2+) by trivalent (Bi3+) into the A-site of BT lattice induced charge misfit and cations disorder, which can be balanced by creating barium ions vacancies into the A-site. Replacing Ti4+ with Zr4+ at the B-site of the lattice reduces the tolerance factor (τ), enhances the degree of relaxor phase, and subsequently enhances the DBSs values due to the larger ionic radius of (Zr4+ = 0.72Å, CN = 6) compared to (Ti4+ = 0.6Å, CN = 6). Furthermore, the maximum difference polarization (ΔP = Pmax – Pr) is enhanced by the hybridization between Bi3+ 6P and O2- 2P instead of Ba2+ 5d and O2- 2P. [(Ba0.85Bi0.06Mg0.06)(Ti0.95Zr0.05)O3] (BT-BMZ0.05) ceramic (BT-BMZ0.05) exhibit highest recoverable energy storage density (Wrec ~ 8 J/cm3), energy storage efficiency (ƞ = 86%) and (Eb ~ 700 kV/cm). Furthermore, the samples showed wide range stability in the temperature range (25-150oC ) and the frequency range (2-20Hz). BT-BMZ0.05 ceramic has significant potential as a viable alternative dielectric for advanced pulsed power capacitors.