Optical absorption and mechanism of vacuum-sintered ZrO2-doped Y2O3 ceramics

Li, Xiaokai; Mao, Xiaojian; Feng, Minghui; Xie, Junxi; Jiang, Benxue; Zhang, Long

doi:10.1016/j.jeurceramsoc.2016.05.046

Cited by 35 publications

(24 citation statements)

References 22 publications

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“…It was found that in the process of vacuum sintering, Y 2 O 3 ceramics with tetravalent additives lose their transparency due to the darkening of color [6], which can significantly limit the potential applications. It is believed that this is due to oxygen atoms that escape from the doped Y 2 O 3 lattice and form oxygen vacancy defects [7], which give rise to the formation of F and F + centers in the wide band gap. It is known that such oxygen vacancies in sintered ceramics can be easily removed by post-annealing in an oxygen atmosphere or in air [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives

et al. 2019

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The results of optical transmission and X-ray core-level spectra measurements of Yb:Y2O3 ceramics with different tetravalent sintering additives (ZrO2, CeO2 and HfO2) fabricated from nanopowders (produced by the laser ablation method) and then annealed at 1400 ℃ in air for 2 h are presented. It is found that the transmission values for ZrO2- and HfO2-doped ceramics at the lasing wavelengths are higher than those of CeO2-doped samples. The X-ray photoelectron spectra (XPS) O 1s spectra show that the relative intensity of oxygen defect peak detected for 3Yb:Y2O3 + 5CeO2 ceramics decreases substantially and consistently compared to that of 5Yb:Y2O3 + 5HfO2 and 3Yb:Y2O3 + 5ZrO2 samples. This can be attributed to a more complete filling of oxygen vacancies due to annealing-induced oxygen diffusion into the highly defective sintered ceramics. The measurements of XPS Ce 3d spectra showed that the insufficiently complete filling of the oxygen vacancies in the 3Yb:Y2O3 + 5CeO2 compound is due to the appreciable presence of trivalent cerium ions.

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Section: Introductionmentioning

confidence: 99%

Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives

et al. 2019

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“…The results are obviously improved compared with those obtained using the same sintering additive, which confirms the feasibility of synthesizing high‐quality transparent Y 2 O 3 ceramics by adding TiO 2 . The obtained results are even better than those obtained using the traditional additives such as ZrO 2 or La 2 O 3 …”

Section: Resultsmentioning

confidence: 66%

“…The sintering behavior and properties of the undoped Y 2 O 3 ceramics and the ceramics doped with 2.72 wt% nanosized ZrO 2 (99.99%; Aladdin, Shanghai, China) were presented for comparison. More details on the fabrication of the ZrO 2 ‐doped ceramics are described elsewhere …”

Section: Methodsmentioning

confidence: 99%

Optical and thermal properties of TiO₂‐doped Y₂O₃ transparent ceramics synthesized by hot isostatic pressing

Zhu

et al. 2018

J Am Ceram Soc

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Highly transparent Y2O3 ceramics using TiO2 as an additive were synthesized by presintering and hot isostatic pressing (HIP). The effects of TiO2 contents and sintering conditions on the optical properties of the final transparent ceramics were investigated. A small amount (0.04‐0.16 wt%) may decrease the densification temperature by about 200°C. The Y2O3 ceramics doped with 0.16 wt% TiO2 revealed a transparency of 82% in the wavelength range 1‐6 μm. The thermal conductivity of the samples is about 11.8 W/m K at 25°C, which is close to that of the undoped Y2O3 ceramics.

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“…The plots of F(R ∞ )E) 1/2 versus photo energy for the estimation of the band gap energy for ZG, ZGW1, ZGW2, ZGW3 and ZGW4 samples. ion is substituted by W 5+,6+ ion which results in the creation of free electrons for electroneutrality, these electrons are trapped to Zr 4+ ion forming Zr 3+ ion which corresponds to the detected EPR signal [65]. No signals were detected for the oxygen vacancy.…”

Section: Characterization Of the Prepared Materialsmentioning

confidence: 92%

Decolourization of crystal violet using nano-sized novel fluorite structure Ga₂Zr_2−xW_xO₇photocatalyst under visible light irradiation

Abbas¹,

Nasr

Abu‐Zurayk

et al. 2020

R. Soc. open sci.

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Fluorite-type Zr-based oxides with the composition Ga 2 Zr 2− x W x O 7 ( x = 0, 0.05, 0.1, 0.15 and 0.2) were prepared using the citrate technique. Appropriate characterizations of all prepared materials were carried out. X-ray diffraction clarified that the undoped and W-doped Ga 2 Zr 2 O 7 samples were crystallized in the cubic fluorite phase structure. The average particle size of the samples was in the range of 3–8 nm. The lowest band gap (1.7 eV) and the highest surface area (124.3 m 2 g −1 ) were recorded for Ga 2 Zr 0.85 W 0.15 O 7. The photocatalytic impacts of the prepared systems were studied by removal of crystal violet (CV) dye employing visible light illumination and taking into consideration the initial dye concentrations, duration of visible irradiation treatment, catalysts dose and the dopant concentration. The obtained results showed higher dye removal with the boost of the catalyst dosage. W doping shifted the absorption to the visible light range by decreasing the band gap from 4.95 eV for parent Ga 2 Zr 2 O 7 to 1.7 eV for 15 mol% tungsten-doped Ga 2 Zr 2 O 7 enhancing the photocatalytic decolourization of CV from 4.2% to 83.6% for undoped and 15 mol% W-doped Ga 2 Zr 2 O 7 , respectively, at optimum operating conditions (pH 9, 1 g l −1 catalyst dose and 300 min) while heavily doped W sample containing 20 mol% W showed lower removal than 15 mol% W-doped Ga 2 Zr 2 O 7 . Complete CV degradation using 15 mol% W-doped Ga 2 Zr 2 O 7 was attained with the assistance of 25 mmol l −1 hydrogen peroxide. The reaction is aligned to pseudo-first-order kinetics. Different scavengers were introduced to decide the significance of the reactive species in CV degradation. O 2 − ∙ and h + had the major role in the degradation of CV by Ga 2 Zr 2− x W x O 7 system compared with HO • .

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Optical absorption and mechanism of vacuum-sintered ZrO2-doped Y2O3 ceramics

Cited by 35 publications

References 22 publications

Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives

Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives

Optical and thermal properties of TiO₂‐doped Y₂O₃ transparent ceramics synthesized by hot isostatic pressing

Decolourization of crystal violet using nano-sized novel fluorite structure Ga₂Zr_2−xW_xO₇photocatalyst under visible light irradiation

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Optical absorption and mechanism of vacuum-sintered ZrO2-doped Y2O3 ceramics

Cited by 35 publications

References 22 publications

Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives

Optical Transparency and Local Electronic Structure of Yb-Doped Y2O3 Ceramics with Tetravalent Additives

Optical and thermal properties of TiO2‐doped Y2O3 transparent ceramics synthesized by hot isostatic pressing

Decolourization of crystal violet using nano-sized novel fluorite structure Ga2Zr2−xWxO7photocatalyst under visible light irradiation

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Product

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Optical and thermal properties of TiO₂‐doped Y₂O₃ transparent ceramics synthesized by hot isostatic pressing

Decolourization of crystal violet using nano-sized novel fluorite structure Ga₂Zr_2−xW_xO₇photocatalyst under visible light irradiation