Sintering and recrystallization of yttrium oxide

Borovkova, L. B.; Лукин, Е. С.; Poluboyarinov, D. N.

doi:10.1007/bf01285771

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…As shown in Fig. 4(c), we fit lnk, and obtain the activation energies E a = 710, 670, and 650 kJ/mol for the samples with 5.0, 10.0, and 15.0 at% La concentrations, respectively, which corresponds to the findings of Borovkova et al [42]. According to a previous kinetic analysis, the grain-size-density (G-ρ) trajectory of La-doped Y 2 O 3 with a sintering temperature of 1750 ℃ for 2-40 h is presented in Fig.…”

Section: Sintering Kinetics Analysissupporting

confidence: 73%

High performance of La-doped Y2O3 transparent ceramics

Zhang

Yang

et al. 2020

J Adv Ceram

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As an optical material, Y2O3 transparent ceramics are desirable for application as laser host materials. However, it is difficult to sinter and dense of Y2O3 hinders the preparation of high-quality optical ceramics via traditional processes. In this work, we use La2O3 as a sintering aid for fabricating high-transparency Y2O3 ceramics using a vacuum sintering process. It is demonstrated that the in-line optical transmittance of 15.0 at% La-doped Y2O3 at a wavelength of 1100 nm achieves a transmittance of 81.2%. A sintering kinetics analysis reveals that a grain-boundary-diffusion-controlled mechanism dominates the faster densification at high La3+ concentrations. It is also shown that both the mechanical and thermal properties of Y2O3 transparent ceramics are significantly improved upon the increase of La2O3 sintering additives. The results indicate that a La-doped Y2O3 transparent ceramic is a promising candidate for a laser host material.

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Section: Sintering Kinetics Analysissupporting

confidence: 73%

High performance of La-doped Y2O3 transparent ceramics

Zhang

Yang

et al. 2020

J Adv Ceram

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“… Grain boundary mobilities for high‐purity and dense Y 2 O 3 obtained from the current work compared with previous data from the literature (data from Borovkova and colleagues 28–37 ). …”

Section: Resultsmentioning

confidence: 62%

Near‐Intrinsic Grain‐Boundary Mobility in Dense Yttria

Harmer

2011

Journal of the American Ceramic Society

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Grain-boundary mobilities and grain growth activation energies were measured on high-purity and dense yttria samples annealed in both air and 5%H 2 -N 2 at temperatures ranging from 12001 to 19001C. The grain-boundary mobility for samples annealed in 5%H 2 -N 2 was higher in comparison with air-annealed materials. The measured grain growth activation energy for samples annealed in air was 356735 kJ/mol. For samples annealed in 5%H 2 -N 2 , a transition temperature of 15791C was identified where the grain growth activation energy changed dramatically. The measured activation energies were 373760 and 77072 kJ/ mol for samples annealed at temperatures below and above 15791C, respectively. The increase in activation energy was tentatively attributed to a reduction-induced disordering of the grain boundary corresponding to the temperature at which yttrium metal liquid forms at low oxygen pressures. The data represent the best attempt to measure the near-intrinsic grainboundary mobility for high-purity highly dense yttria. High-resolution transmission electron microscopyand high-angle annular dark field-scanning transmission electron microscopy confirmed that the grain boundaries were clean and free of any observable second phases.

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“…For example, intense crystal growth in sintering of MgO begins at an open porosity of about 10%, Al203 begins to sinter at an open porosity of 4-5%, and Y203 at an open porosity of 3-4% [98,99]. For example, intense crystal growth in sintering of MgO begins at an open porosity of about 10%, Al203 begins to sinter at an open porosity of 4-5%, and Y203 at an open porosity of 3-4% [98,99].…”

Section: K=expmentioning

confidence: 99%

Modern high-density oxide ceramics. Part III. Microstructure and recrystallization processes in ceramic oxide materials

Лукин

1996

Refractories

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Recrystallization processes in oxide ceramics at high temperatures are considered. It is established that the microstructure of the ceramics remains equal-size-grained at all heating temperatures. The proportion of crystals with minimum and maximum sizes is controlled by the initial grain composition. The growth of crystals in coarse-crystal structures occurs by the joining of crystals in their rotation due to the stresses that develop. It is established that the degree of crystal growth in solid solutions depends on the sign of the change in the lattice parameter; as the parameter decreases, the structure always becomes fine-crystalline, and vice v{~rsa.

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Sintering and recrystallization of yttrium oxide

Cited by 5 publications

References 2 publications

High performance of La-doped Y2O3 transparent ceramics

High performance of La-doped Y2O3 transparent ceramics

Near‐Intrinsic Grain‐Boundary Mobility in Dense Yttria

Modern high-density oxide ceramics. Part III. Microstructure and recrystallization processes in ceramic oxide materials

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