Fabrication of transparent Y2Hf2O7 ceramics via vacuum sintering

Zhou, Guanghui; Wang, Zhengjuan; Zhou, Bo; Zhao, Yi; Zhang, Guangjun; Wang, Shiwei

doi:10.1016/j.optmat.2012.09.016

Cited by 30 publications

(14 citation statements)

References 19 publications

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“…The ceramic showed a transmittance of 50% (1 mm thick) in the visible spectral region. Further, Zhou et al [87] optimized this process and the (Fig. 7) was improved to 60% (1 mm thick) in the visible spectra region (Fig.…”

Section: A 2 Hf 2 O 7 System Transparent Ceramicsmentioning

confidence: 99%

Recent development of A2B2O7 system transparent ceramics

et al. 2018

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A 2 B 2 O 7 system compounds, which usually present three phase structures mainly based on the ionic radius ratios of r A and r B (r A /r B), have been studied for potential applications in many fields, such as thermal barrier coatings, luminescence powders, fast-ion conductors, photocatalysts, and matrices for immobilization of highly active radionuclides. Since 2005, La 2 Hf 2 O 7 was fabricated into transparent ceramics and much more attentions were paid on A 2 B 2 O 7 transparent ceramics for new applications. In this review, the development of A 2 B 2 O 7 system transparent ceramics was described. The structure characteristics, powder synthesis method, and sintering techniques of the final A 2 B 2 O 7 transparent ceramics were summarized. After that, the mostly reported A 2 Hf 2 O 7 , A 2 Zr 2 O 7 , and A 2 Ti 2 O 7 system transparent ceramics were systematically introduced. The potential application fields and future development trends were also discussed, focusing on scintillators, optical elements, and other luminescent materials.

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Section: A 2 Hf 2 O 7 System Transparent Ceramicsmentioning

confidence: 99%

Recent development of A2B2O7 system transparent ceramics

et al. 2018

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“…The most commonly used method for the preparation of lanthanide hafnate ceramic is via solid-state reaction of metal oxides [7][8][9][10][11][12][13][14][15][16][17][18], including mixed-oxide route via reactive spark plasma sintering [19] or vacuum sintering [20,21]. By employing the traditional mixed oxide processing route, solid state reaction [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] leads to the formation of crystalline Ln 2 Hf 2 O 7 after extended calcination time at high temperature owing to the low specific surface area of the metal oxides at which diffusion reaction occurs.…”

Section: Introductionmentioning

confidence: 99%

“…By employing the traditional mixed oxide processing route, solid state reaction [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] leads to the formation of crystalline Ln 2 Hf 2 O 7 after extended calcination time at high temperature owing to the low specific surface area of the metal oxides at which diffusion reaction occurs. In addition, this process of grinding/ball-milling in organic solvent (to preserve the stoichiometry of the components), pelleting and sintering is often required to be repeated to allow sufficient interdiffusion of cations for the preparation of single phase samples.…”

Section: Introductionmentioning

confidence: 99%

Soft chemical synthesis and structural characterization of Y2HfxTi2−xO7

Kong

Zhang

Whittle

et al. 2015

Ceramics International

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“…The asymmetric ratio R in dependence of different atomic percentage of Eu 3+ (1, 3, 5, 7, 10 and 15 %) is presented in Figure 4(b). These results indicates that the local environment of the ion was stable and does not change with concentrations in this range [27]. Figure 5(b).…”

Section: Judd-ofelt Calculations and Resultsmentioning

confidence: 73%

Analysis of luminescence of Eu3+ doped Lu2Ti2O7 powders with Judd-Ofelt theory

Vuković¹,

Ćulubrk²,

Sekulić³

et al. 2015

Journal of Research in Physics

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Eu3+ doped Lu2Ti2O7 particles of 6 to 10 nm in diameter are prepared by Pechini-type polymerized complex route based on polyesterification between citric acid (CA) and ethylene glycol. X-ray diffraction measurements confirmed that Eu3+ doped Lu2Ti2O7 powders crystallized in the face-centered cubic lattice (Fd3m). Emission spectra displayed characteristic 5D0 →7 FJ (J = 0, 1, 2, 3 and 4) spin forbidden f-f electronic transitions of the Eu3+ ions with the most pronounced emission coming from 5D0 →7 F2 and with the emission decays varying between 0.75 and 0.60 ms for samples doped with different concentration of Eu3+. The Judd-Ofelt theory was applied to the experimental data for the quantitative determination of optical parameters such as Ω2, Ω4 Judd-Ofelt parameters, radiative and nonradiative transition rates and emission quantum efficiency. It was observed that, for all the samples, Ω2 >> Ω4. The luminescence quantum yields were calculated by means of the Judd-Ofelt theory and the highest value 60.83 % is obtained for particles doped with concentration of 3 % Eu3+.

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Fabrication of transparent Y2Hf2O7 ceramics via vacuum sintering

Cited by 30 publications

References 19 publications

Recent development of A2B2O7 system transparent ceramics

Recent development of A2B2O7 system transparent ceramics

Soft chemical synthesis and structural characterization of Y2HfxTi2−xO7

Analysis of luminescence of Eu3+ doped Lu2Ti2O7 powders with Judd-Ofelt theory

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