In-situ thermal phase transition and structural investigation of ferroelectric tetragonal barium titanate nanopowders with pseudo-cubic phase

Kim, Dong Hyun; Lee, Seung Jun; Theerthagiri, Jayaraman; Choi, Moonhee; Jung, Jongsuk; Yu, Yiseul; Im, Kwang Seop; Jung, Hyeon Jin; Nam, Sang Yong; Choi, Myong Yong

doi:10.1016/j.chemosphere.2021.131218

Cited by 17 publications

(5 citation statements)

References 36 publications

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“…Figures 3b-3c show the Raman shifts of ν 1 and ν 5 , it is observed that the addition of BSZN induces the shifting in the ν 1 and ν 5 peaks, further confirmation has been provided that the ceramic samples with the introduction of BSZN exhibit the R-phase structure. 16 These findings are consistent with the XRD analysis. Figure 3d displays the full width at half maximum (FWHM) of ν 1 and ν 5 , which exhibits similar change.…”

Section: Resultssupporting

confidence: 87%

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Yang,

Li,

Deng

et al. 2024

ECS J. Solid State Sci. Technol.

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In this study, (1-x)K0.5Na0.5NbO3−xBa0.5Sr0.5(Zn1/3Nb2/3)O3, [(1-x)KNN-xBSZN] lead-free relaxor ceramics were fabricated by a conventional solid-state reaction method. X-ray diffraction and Raman spectra confirm the R-C phase transition of the ceramics. The incorporation of BSZN effectively suppressed grain growth, enhanced the electrical resistivity, and improved the relaxation behavior. By analyzing the ferroelectric property of the sample under breakdown field, it is found that when x=0.08, the ceramic demonstrates the smallest variation in polarization (∆P=12.43 μC/cm2), the highest recoverable energy storage density (Wrec=0.8 J/cm3) and energy storage efficiency (η=58.8%). The enhancement of energy storage is attributed to the introduction of BSZN, which effectively suppresses grain growth and improves the relaxation behavior of the ceramics. The results show that the ceramic enables be used in pulsed-power systems at low electrical field.

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Section: Resultssupporting

confidence: 87%

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Yang,

Li,

Deng

et al. 2024

ECS J. Solid State Sci. Technol.

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“…The XRD Rietveld refinement data for the BTO structure, which is illustrated in Figure S1a, are shown in Figure S1b. The XRD data reveal that the BTO (200) peak exhibits a shoulder at the lower angles, which is indicative of the (002) to (002) + (200) peak splitting and associated onset of the cubic → tetragonal BTO phase transformation. , …”

Section: Resultsmentioning

confidence: 96%

“…The XRD data reveal that the BTO (200) peak exhibits a shoulder at the lower angles, which is indicative of the (002) to (002) + (200) peak splitting and associated onset of the cubic → tetragonal BTO phase transformation. 21,22 The presence of tetragonal BTO was confirmed by laser Raman microspectroscopy, the spectra for which are shown in Figure 1d. The main features observed include a small peak at 175 cm −1 [A 1 (TO), E(LO)], a broad peak centered at 265 cm −1 [A 1 TO], a relatively sharp peak at 306 cm −1 [B 1 , E(TO + LO)], a broad sharp peak centered at 520 cm −1 [A 1 , E(TO)], and a small broad peak centered at 720 cm −1 [A 1 , E(LO)].…”

Section: ■ Introductionmentioning

confidence: 90%

Efficient Cocatalyst-Free Piezo-Photocatalytic Hydrogen Evolution of Defective BaTiO_3–x Nanoparticles from Seawater

Jiang

Toe

Mofarah

et al. 2023

ACS Sustainable Chem. Eng.

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Hydrogen is a promising fossil-fuel alternative fuel owing to its environmentally neutral emissions and high energy density. However, the need for purified water and external power are critical hindrances to the implementation of hydrogen production. The present work demonstrates the potential to overcome these shortcomings through piezo-photocatalysis of seawater using defective BaTiO3–x (BTO) nanoparticles. This material was made piezoelectrically active by a straightforward annealing process under different atmospheres, including O2, N2, Ar, or H2, the latter of which caused Ti4+ → Ti(4–x)+ multiple reductions and structural distortions that stabilize piezoelectric tetragonal domains. A suite of experimental techniques was employed to reveal the effects of reduction on the energy band structure. A substantial piezoelectric effect and the presence of self-polarization were confirmed by piezoresponse force microscopy, while simulation work clarified the role of vibrations on band bending deriving from the self-polarization. The hydrogen evolution through photocatalysis, piezocatalysis, and piezo-photocatalysis over the defective BaTiO3–x nanoparticles was characterized with deionized (DI) water, simulated seawater, and natural seawater. A promising HER with a rate of 132.4 μmol/g/h was achieved using DI water through piezo-photocatalysis without a cocatalyst. In contrast, a substantial HER rate of 48.7 μmol/g/h was obtained for natural seawater, despite the deleterious impact of dissolved ions. The present work offers new perspectives for large-scale green H2 production using abundant natural resources with a conventional piezoelectric material that is readily available but still affected by the ions dissolved in seawater.

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“…[ 2,3 ] Furthermore, these materials have high physical performance, piezoelectric, ferroelectric, dielectric, and electro‐optical properties, [ 4 ] which make them ideal for a variety of applications such as semiconductors, capacitors, ultrasonic transducers, piezoelectric devices, thermistors, and high‐storage memory devices. [ 5 ]…”

Section: Introductionmentioning

confidence: 99%

“…[2,3] Furthermore, these materials have high physical performance, piezoelectric, ferroelectric, dielectric, and electro-optical properties, [4] which make them ideal for a variety of applications such as semiconductors, capacitors, ultrasonic transducers, piezoelectric devices, thermistors, and high-storage memory devices. [5] When compared to other ceramics for this application, ceramics based on BaTiO 3 are preferable due to their simple crystal structure, anisotropic optical behavior, high stability, very high dielectric constant, and low leakage current. [6,7] Its improved piezoelectric, dielectric, and ferroelectric performances make it a competitive material for usage in microelectronic and electro-ceramic systems, including high-storage memory devices, capacitors, thermistors, ultrasonic transducers, semiconductors, and piezoelectric devices.…”

mentioning

confidence: 99%

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

Mahmud

Ahamed

Khan

2023

Physica Status Solidi (a)

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Considering the multifunctional performance, the (Ba0.7Sr0.3)0.98Ca0.02Ti1−xCoxO3 (x = 0.00–0.2) ceramics are successfully synthesized using the traditional solid‐phase reaction method. The effect of cobalt doping on the samples’ structural, morphological, magnetic, electrical, and optical characteristics is elucidated. Raman spectroscopy and X‐ray diffraction data confirm the dopants’ integration into the cubic perovskite microstructure. At room temperature, the magnetization–magnetic field intensity hysteresis loops from vibrating sample magnetometer reveal the samples’ ferromagnetic character, with a maximum magnetization of 0.091 emu g−1 achieved for x = 15%. The real part of the initial permeability demonstrates that the replacement of Co2+ causes a shift in resonance toward higher frequencies above 85 MHz, indicating the potential of the synthesized ceramics for high‐frequency magnetic applications. The variation in dielectric characteristics from 100 Hz to 10 MHz is explained using electron hopping on octahedral sites and Maxwell–Wagner's model. The increase of AC conductivity in the high‐frequency region is consistent with the strengthening of the grain effect on the conduction mechanism, which supports the small‐range polaron‐hopping theory. The complex electric modulus's peak (M′′) shifts toward a higher‐frequency region with cobalt content, suggesting a reduction in the relaxation rate. The optical bandgap is observed to decrease from 3.08 to 2.96 eV with cobalt content.

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In-situ thermal phase transition and structural investigation of ferroelectric tetragonal barium titanate nanopowders with pseudo-cubic phase

Cited by 17 publications

References 36 publications

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Efficient Cocatalyst-Free Piezo-Photocatalytic Hydrogen Evolution of Defective BaTiO_3–x Nanoparticles from Seawater

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications

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In-situ thermal phase transition and structural investigation of ferroelectric tetragonal barium titanate nanopowders with pseudo-cubic phase

Cited by 17 publications

References 36 publications

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Improving Energy Storage Properties of KNN Ceramic through Composition Modification

Efficient Cocatalyst-Free Piezo-Photocatalytic Hydrogen Evolution of Defective BaTiO3–x Nanoparticles from Seawater

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba0.7Sr0.3)0.98Ca0.02Ti1−XCoxO3 Ceramics for Device Applications

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Efficient Cocatalyst-Free Piezo-Photocatalytic Hydrogen Evolution of Defective BaTiO_3–x Nanoparticles from Seawater

Effect of Cobalt Doping on Structural, Morphological, Magnetic, Electrical, and Optical Properties of (Ba_0.7Sr_0.3)_0.98Ca_0.02Ti_1−XCo_xO₃ Ceramics for Device Applications