High performance of La-doped Y2O3 transparent ceramics

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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“…The thermal conductivity (k) decreased with increasing temperature, which can be well described by Eq. ( 5) [5,42]:…”

Section: Resultsmentioning

confidence: 99%

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

Yang

Huang

et al. 2022

J Adv Ceram

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“…Based on the aforementioned results, we consider that the fracture and rearrangement of nanorods under modest temperature and pressure also contributes to the high sintering e ciency of nanorods powders as it will further increase the surface area of the powders and consolidated density of ceramics. Y 2 O 3 is an attractive optical material using as infrared dome and laser host [30]. As Y 2 O 3 transparent ceramic was successfully obtained from nanorods powders, the in-line transmittance spectra and the optical image of the ceramic sintered at 1300 °C is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

An Improving Densification in Spark Plasma Sintering Ultrafine-grained Y2O3 Transparent Ceramic by Particle Fracture and Rearrangement

Huang¹,

Shi²,

Zhang³

et al. 2021

Preprint

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Herein, we report a new strategy on an improving densification in spark plasma sintering (SPS) ultrafine-grained Y2O3 transparent ceramic using anisotropic-shaped nanorod powders. At the low temperature stage (<600°C), fracture and rearrangement of nanorod powders will appear which can further improve the initial density of particle compact and reduce the initial particle size. When the temperature reaches beyond 600°C, the sintering efficiency of nanorod powder compact will exceed that of the green body packed by spherical powders. The ceramic sample sintered at 1300°C from nanorods is transparent with ultra-fine grain and shows good optical and mechanical properties, while the corresponding ceramic from near-spherical nanocrystalline powders is not dense enough and opaque.

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“…Y 2 O 3 is an attractive optical material used as an IR dome and laser host [36]. As the Y 2 O 3 transparent ceramics were successfully obtained from the nanorod powders, the in-line transmittance spectra and the optical image of the ceramics sintered at 1300 ℃ are presented in Fig.…”

Section: In-line Transmittancementioning

confidence: 99%

An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

Huang

Shi²,

Zhang³

et al. 2022

J Adv Ceram

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Achieving full densification of some ceramic materials, such as Y2O3, without sintering aids by spark plasma sintering (SPS) is a great challenge when plastic deformation contributes limitedly to the densification as the yield stress of the material at an elevated temperature is higher than the applied sintering pressure. Herein, we demonstrate that particle fracture and rearrangement is an effective strategy to promote the densification during the pressure-assisted sintering process. Specifically, Y2O3 nanocrystalline powders composed of nanorod and near-spherical particles were synthesized and sintered at various temperatures by the SPS. The results show that the relative density of the ceramics prepared by the nanorod powders is higher than the density of the ceramics from the near-spherical powders after 600 °C due to the fracture and rearrangement of the nanorods at low temperatures, which leads to the decrease of particle size and the increase of density and homogeneity. Based on this novel densification mechanism, ultrafine-grained Y2O3 transparent ceramics with good optical and mechanical properties were fabricated successfully from the nanorod powders.

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High performance of La-doped Y2O3 transparent ceramics

Cited by 42 publications

References 54 publications

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

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

An Improving Densification in Spark Plasma Sintering Ultrafine-grained Y2O3 Transparent Ceramic by Particle Fracture and Rearrangement

An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

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