Preparing Bi<sub>12</sub>SiO<sub>20</sub> crystals at low temperature through nontopotactic solid-state transformation and improving its photocatalytic activity by etching

Han, Qiaofeng; Zhang, Juan; Wang, Xin; Zhu, Junwu

doi:10.1039/c5ta00628g

Cited by 47 publications

(12 citation statements)

References 37 publications

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“…This phenomenon is consistent with a previous report. 35 In addition, if the whole reaction system was controlled at 120 °C for 24 h, a pure BFO product could be also prepared (Fig. 6), which further proved the rationality of our viewpoint.…”

Section: Influencing Factorssupporting

confidence: 67%

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Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi₂₅FeO₄₀tetrahedrons

Zhang

Zou

et al. 2015

CrystEngComm

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Novel nanoparticle-assembled Bi 25 FeO 40 (BFO) tetrahedrons with relatively good dispersion were successfully synthesized through a facile, mild and rapid hydrothermal process. The phases and morphologies of the samples were characterized by powder X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). Such sillenite-type BFO tetrahedrons were found to be fabricated by abundant nanoparticles with single crystalline nature. Some influencing factors including reaction time, temperature and the amount of additives (e.g., polyacrylamide, sodium citrate and sodium hydroxide) were revealed to play crucial roles in the generation of this BFO nanoarchitecture. Moreover, the visible lightdriven photocatalytic activities of the BFO products were investigated. CrystEngCommThis journal is

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Section: Influencing Factorssupporting

confidence: 67%

“…This fact implies that this reaction temperature (90°C) is too low, such that the BFO sample fails to form. 35 In addition, if the whole reaction system was controlled at 120°C for 24 h, a pure BFO product could be also prepared (Fig. 5b).…”

Section: Influencing Factorsmentioning

confidence: 99%

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi₂₅FeO₄₀tetrahedrons

Zhang

Zou

et al. 2015

CrystEngComm

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“…In literature the reported bandgap energy of BSO varies between 2.2 and 3.4 eV. [ 13,20,44–46 ] The plot shows that the bandgap energy of BSO decreases with the incorporation of Cr in the lattice (Table 2). To examine the correlation between the effect of Cr doping on the lattice parameter and the bandgap energy, both are shown in Figure 8 as a function of Cr concentration.…”

Section: Resultsmentioning

confidence: 99%

Crystal Interface Control at Low Thermal Gradient and Investigation of the Effect of Cr on the Crystal Structure and Optical Properties of Bismuth Silicate

Bhaumik

Viswanathan

Bhatt

et al. 2021

Physica Status Solidi (b)

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Sillenite structure crystals (general composition Bi 12 XO 20 , X ¼ Si, Ge, and Ti with space group I23) posses a number of properties important for practical applications. [1,2] They are characterized by XO 4 tetrahedra located at the center and corners of its cubic unit cell. These XO 4 tetrahedra are linked with stereochemically active 6s 2 lone electron pair of Bi 3þ via BiO 5 octahedra. [3][4][5] This, along with the absence of inversion symmetry, is the source of outstanding electrical and optical properties suitable for photorefractive applications. [1][2][3][4][5] Among sillenites, bismuth silicate (Bi 12 SiO 20 , BSO) is a technologically important material as it exhibits large electro-optic and photoconductive effects, which make it suitable for optical switches, optics-based electric field sensors, holographic storage, and photorefractive devices. [6][7][8][9][10][11][12][13][14] It is used for two-wave mixing, four-wave mixing, phase conjugation, real-time holography, optical data storage, optical computing, and electro-optical modulation. [7,8] It has been reported that the photorefractive property of BSO is enhanced significantly on doping with metals like Cr, Fe, Mg, Ru, etc. [8,[15][16][17][18][19][20][21][22][23][24][25][26][27] Though most of these dopants make material sensitive to photorefraction in the visible region, especially around 500 nm, that is, 2.5 eV, practical feasibility prefers the region near the infrared (1.5À2 eV), mainly because of the availability of compact laser diodes in this region. [28] Cr doping shifts the photorefractive sensitivity of BSO to the near-infrared region and therefore makes it a potential material for applications like optical image processing, holographic interferometry, optical storage, and phase conjugation. In literature, there are reports on the growth of Cr-doped BSO crystal and investigations on the photorefractive effect, dielectric property, optical activity, Faraday effect, etc. [15][16][17][18][19][20][21][22][23][24] For the growth of the crystal, Czochralski technique has been used as BSO is a congruently melting compound. [25,26] It is known that the devices mentioned earlier require crystals with a low dislocation density and high optical homogeneity. [29] One of the important aspects of growth of crystals having low dislocation density is to grow the crystal with a flat-ish crystalÀmelt interface. [26] A few studies have been reported on undoped BSO for relatively higher thermal gradient. [30,31] However, to obtain large-sized good quality crystal of BSO, a lower thermal gradient is favorable. [32] In view of this, one of the objectives of the work is investigate the effect of the growth condition on the interface shape control of the Cr:BSO crystal when grown along 〈110〉 in the lower axial

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“…In the Bi 2 O 3 -SiO 2 system there is a large number of crystalline ternary bismuth compounds, such as Bi 2 SiO 5 , Bi 4 Si 3 O 12 and Bi 12 SiO 20 [10][11][12][13][14]. One of the most common compounds in the Aurivillius [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Structure and dielectric behaviour of Sr-modified Bi4Si3O12 thin films prepared via sol gel method

Sadeghzadeh‐Attar

Hajijafari-Bidgoli

Reza

2018

PAC

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Bismuth silicate (Bi 4 Si 3 O 12 , BSO) nanostructured films containing 0, 1, 2, and 3 mol% Sr were prepared via sol-gel method and annealed at different temperatures up to 700°C. The effects of Sr content on the structure and morphology of prepared films were investigated. SEM images showed that surfaces of the prepared films were dense, smooth and homogeneous. The average particle size was changed from 30 to 35 nm as the annealing temperature was increased from 500 to 700°C. Variation of the dielectric constant and dielectric loss as a function of frequency and annealing temperature for the synthesized thin films with different content of Sr were also studied. The dielectric constant and dielectric loss decrease with Sr addition, and reach the minimum for the sample containing 2 mol% Sr. These changes could be attributed to the crystal structure and formation of secondary phases.

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Preparing Bi₁₂SiO₂₀ crystals at low temperature through nontopotactic solid-state transformation and improving its photocatalytic activity by etching

Abstract: The egg-tart shaped BiOCl hierarchitectures with efficient visible-light photocatalytic activity were prepared through etching of Bi12SiO20 obtained at low temperature.

Cited by 47 publications

References 37 publications

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi₂₅FeO₄₀tetrahedrons

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi₂₅FeO₄₀tetrahedrons

Crystal Interface Control at Low Thermal Gradient and Investigation of the Effect of Cr on the Crystal Structure and Optical Properties of Bismuth Silicate

Structure and dielectric behaviour of Sr-modified Bi4Si3O12 thin films prepared via sol gel method

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Preparing Bi12SiO20 crystals at low temperature through nontopotactic solid-state transformation and improving its photocatalytic activity by etching

Abstract: The egg-tart shaped BiOCl hierarchitectures with efficient visible-light photocatalytic activity were prepared through etching of Bi12SiO20 obtained at low temperature.

Cited by 47 publications

References 37 publications

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi25FeO40tetrahedrons

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi25FeO40tetrahedrons

Crystal Interface Control at Low Thermal Gradient and Investigation of the Effect of Cr on the Crystal Structure and Optical Properties of Bismuth Silicate

Structure and dielectric behaviour of Sr-modified Bi4Si3O12 thin films prepared via sol gel method

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Preparing Bi₁₂SiO₂₀ crystals at low temperature through nontopotactic solid-state transformation and improving its photocatalytic activity by etching

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi₂₅FeO₄₀tetrahedrons

Hydrothermal synthesis, influencing factors and excellent photocatalytic performance of novel nanoparticle-assembled Bi₂₅FeO₄₀tetrahedrons