Properties of transparent Re3+: Y2O3 ceramics doped with tetravalent additives

Осипов, В. В.; Шитов, В. А.; Maksimov, R.N.; Solomonov, V. I.

doi:10.1016/j.optmat.2015.04.021

Cited by 36 publications

(19 citation statements)

References 14 publications

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“…This is because there are the smaller crystallites generated under vacuum than in air at the same calcination temperature and time. This is similar to the effect of tetravalent ion addition on the grain size of the yttria during sintering . Tetravalent ion doping helps to inhibit the grain growth, and the smaller grains prevent interparticle pore trapping during the densification of transparent ceramics.…”

Section: Resultssupporting

confidence: 52%

“…The recent research and reports have shown the fabrication method of transparent yttria via hot pressing, vacuum sintering and hot isostatic pressing (HIP) for superior optical properties . There have also been many studies on the synthesis of yttria powder with high sinterability and the improvement of the transmittance according to the powder characteristics …”

Section: Introductionmentioning

confidence: 99%

“…The representative additive ion is Zr 4+ , and it has been studied for its inhibition of grain growth on transparent Y 2 O 3. The addition of the other tetravalent ions such as Ti 4+ and Hf 4+ on Y 2 O 3 also contributes to the inhibition of grin growth, which enhances the elimination of pores . To achieve almost fully dense ceramics, the interparticle pores need to be removed while the grain growth is suppressed.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15] There have also been many studies on the synthesis of yttria powder with high sinterability and the improvement of the transmittance according to the powder characteristics. [16][17][18] It is well-known that the residual pores in sintered products are one of the main light scattering factors which need to be removed entirely to achieve theoretical optical transmittance. 19 Even a porosity of 100 ppm with a size of 100 nm can deteriorate approximately 50% of theoretical transparency at 600 nm for typical transparent ceramics, according to the Mie scattering theory.…”

Section: Introductionmentioning

confidence: 99%

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Effects of calcination atmosphere on monodispersed spherical particles for highly optical transparent yttria ceramics

et al. 2017

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Highly sinterable powders are required for the fabrication of transparent ceramics. Here, we studied the effects of calcination atmosphere on the characteristics of monodispersed spherical Y2O3 powders, such as crystallite size and particle density, for high optical transparent ceramics. It was found that vacuum calcination around the crystallization temperature is the crucial step to eliminate intragranular pores in the spherical particle. The fast decomposition rate in a vacuum creates smaller crystallites, and the following higher calcination temperature results in the enhancement of pore elimination. The in‐line transmittance of the transparent Y2O3 ceramics, vacuum sintered at 1750°C, was improved by increasing the particle density of the as‐calcined powders. This result indicates that the high‐density starting particles effectively enhance the pore elimination during the fabrication of transparent Y2O3 ceramics.

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Section: Resultssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of calcination atmosphere on monodispersed spherical particles for highly optical transparent yttria ceramics

et al. 2017

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“…Figure shows SEM images of the Tm:Y 2 O 3 ceramics doped with different amounts of Al 2 O 3 . As the tetravalent cations, such as Zr 4+ , Hf 4+ , and Th 4+ , are very effective to reduce the grain‐boundary mobility and prevent exaggerate grain growth of Y 2 O 3, it is not surprised that intragranular pores were not detected in all the samples. However, grain‐boundary pores were easily observed in the sample without Al 2 O 3 , as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Densification of Yttria Transparent Ceramics: The Utilization of Activated Sintering

et al. 2016

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Highly transparent 0.5 at.% Tm:Y 2 O 3 ceramics were prepared by using solid-state reaction combined with vacuum sintering method, with ZrO 2 and Al 2 O 3 as sintering aids. Doping amount of ZrO 2 was fixed at 1 at.%, while the effect of Al 2 O 3 on densification, microstructure evolution, and transmittance of the Y 2 O 3 ceramics was carefully studied. It was found that the addition of Al 2 O 3 was very effective in improving densification of Y 2 O 3 , due to the formation of an Al-rich eutectic phase Y 4 Al 2 O 9 (YAM) during the sintering process. As the content of Al 2 O 3 was increased from 0 to 81.8 wt ppm, porosity of the ceramics was decreased and transmittance was increased. However, when the content of Al 2 O 3 was increased to 137 wt ppm, a secondary phase began to segregate at grain junctions. Further increase in the amount of Al 2 O 3 led to an increase in both amount and size of the secondary phase. At the optimized content of Al 2 O 3 with 81.8 wt ppm, the Tm:Y 2 O 3 ceramics sintered at 1860°C for 13 h exhibited an in-line transmittance of 83.0% at 2000 nm and 76.5% at 600 nm. It is expected that this finding can be readily applied to other transparent ceramics.

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Optical, thermal, and mechanical properties of (Y1−xScx)2O3 transparent ceramics

Yang

Huang

et al. 2022

J Adv Ceram

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Sesquioxides such as Y2O3 and Sc2O3 are important optical materials, but the fabrication of their transparent ceramics remains a challenge due to the ultra-high melting point of over 2400 °C. In this work, a series of (Y1−xScx)2O3 transparent ceramics were successfully fabricated by a simple vacuum sintering process without any sintering additives, and the effect of scandium (Sc) content (x) on the crystal structure and optical/thermal/mechanical properties was evaluated. Y2O3 and Sc2O3 form a complete solid solution with a cubic bixbyite structure. The formation of (Y1−xScx)2O3 solid solution promotes the densification of ceramics, leading to the realization of high transparency close to the theoretical transmittance over a wide wavelength range of 0.35–8 µm. In particular, the in-line transmittance in the range of 0.6–6 µm remains above 80% for (Y1−xScx)2O3 with x = 0.23–0.31, while the pristine Y2O3 and Sc2O3 are opaque. Moreover, the mechanical properties including Vickers hardness (HV), fracture toughness (KIC), and biaxial flexural strength (δb) are evidently enhanced due to the solid solution strengthening, while the thermal conductivity (k) is reduced due to the reduction of photon free path. This study demonstrates that forming of solid solution is a facile and universal approach for preparing sesquioxide transparent ceramics with high optical and mechanical quality.

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Properties of transparent Re3+: Y2O3 ceramics doped with tetravalent additives

Cited by 36 publications

References 14 publications

Effects of calcination atmosphere on monodispersed spherical particles for highly optical transparent yttria ceramics

Effects of calcination atmosphere on monodispersed spherical particles for highly optical transparent yttria ceramics

Densification of Yttria Transparent Ceramics: The Utilization of Activated Sintering

Optical, thermal, and mechanical properties of (Y1−xScx)2O3 transparent ceramics

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