Effects of phase and chemical composition of precursor on structural and morphological properties of (Lu0.95Eu0.05)2O3 nanopowders

Dulina, N. A.; Baumer, V. N.; Danylenko, M.I.; Mateychenko, P.V.; Tolmachev, A. V.; Vovk, O.M.; Yavetskiy, R.P.

doi:10.1016/j.ceramint.2012.08.092

Cited by 20 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Alpha-Nano Y 2 O 3 powders are formed by lamellar particle aggregates of rhombic shape with a typical thickness of 25-50 nm. Similar particles can be obtained by the chemical co-precipitation method at large supersaturation values of mother solution [29]. According to dynamic light scattering (DLS) results, Alfa-Micro and ITO-V Y 2 O 3 powders have a similar particle size distribution (Figs.…”

Section: Selection Of Starting Materials For Solid-state Sintering supporting

confidence: 55%

Effect of starting materials and sintering temperature on microstructure and optical properties of Y2O3:Yb3+ 5 at% transparent ceramics

et al. 2020

View full text Add to dashboard Cite

Y2O3:Yb3+ 5 at% ceramics have been synthesized by the reactive sintering method using different commercial yttria powders (Alfa-Micro, Alfa-Nano, and ITO-V) as raw materials. It has been shown that all Y2O3 starting powders consist from agglomerates up to 5–7 µm in size which are formed from 25–60 nm primary particles. High-energy ball milling allows to significantly decreasing the median particle size D50 below 500 nm regardless of the commercial powders used. Sintering experiments indicate that powder mixtures fabricated from Alfa-Nano yttria powders have the highest sintering activity, while (Y0.86La0.09Yb0.05)2O3 ceramics sintered at 1750 °C for 10 h are characterized by the highest transmittance of about 45%. Y2O3:Yb3+ ceramics have been obtained by the reactive sintering at 1750–1825°C using Alfa-Nano Y2O3 powders and La2O3+ZrO2 as a complex sintering aid. The effects of the sintering temperature on densification processes, microstructure, and optical properties of Y2O3:Yb3+ 5 at% ceramics have been studied. It has been shown that Zr4+ ions decrease the grain growth of Y2O3:Yb3+ ceramics for sintering temperatures 1750–1775 °C. Further increasing the sintering temperature was accompanied by a sharp increase of the average grain size of ceramics referred to changes of structure and chemical composition of grain boundaries, as well as their mobility. It has been determined that the optimal sintering temperature to produce high-dense yttria ceramics with transmittance of 79%–83% and average grain size of 8 µm is 1800 °C. Finally, laser emission at ∼1030.7 nm with a slope efficiency of 10% was obtained with the most transparent Y2O3:Yb3+ 5 at% ceramics sintered.

show abstract

Section: Selection Of Starting Materials For Solid-state Sintering supporting

confidence: 55%

Effect of starting materials and sintering temperature on microstructure and optical properties of Y2O3:Yb3+ 5 at% transparent ceramics

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In this work, AHC was used as the precipitants to synthesize precursors during the normal‐striking precipitation process. The R value, defined as the molar ratio of precipitant, AHC in this work, to metal ions, was proposed to evaluate the quantities of precipitants in the co‐precipitation process . We try to improve the purity and the grade of dispersion of the precursors and the final powders by adjusting quantities of precipitants to change the reaction time and terminal pH value of mixture solution in order to optimize the performance of transparent ceramics.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and laser operation of Yb:Lu₂O₃ transparent ceramics from co‐precipitated nano‐powders

et al. 2019

View full text Add to dashboard Cite

In this article, 5 at.% Yb:Lu2O3 transparent ceramics were fabricated by vacuum sintering combined with hot isostatic pressing (HIP) posttreatment using co‐precipitated nano‐powders. The influence of precipitant molar ratio, ammonium hydrogen carbonate, to metal ions (AHC/M3+, R value) on the properties of Yb:Lu2O3 precursors and calcined powders was investigated systematically. It was found that the powders with different R value calcined at 1100°C for 4 hours were pure cubic Lu2O3 but the morphologies of precursors and powders behaved differently. The opaque samples pre‐sintered at 1500°C for 2 hours grew into transparent ceramics after HIP posttreatment at 1750°C for 1 hour. The final ceramic with R = 4.8 showed the best optical quality with the in‐line transmittance of 79.7% at 1100 nm. The quasi‐CW laser operation was performed at 1034 nm and 1080 nm with a maximum output power up to 8.15 W as well as a corresponding slope efficiency of 58.4%.

show abstract

“…At the end of 20th century, the Lu 2 O 3 :Eu X-ray phosphor became a subject of thorough research [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. Also, other activators were used, especially for lasing in Lu 2 O 3 sintered transparent bodies [20,21].…”

Section: Introductionmentioning

confidence: 99%

Flux-Aided Synthesis of Lu2O3 and Lu2O3:Eu—Single Crystal Structure, Morphology Control and Radioluminescence Efficiency

2014

View full text Add to dashboard Cite

Li2SO4 or (Li2SO4 + SiO2)-mixture fluxes were used to prepare a Lu2O3:Eu powder phosphor as well as an undoped Lu2O3 utilizing commercial lutetia and europia as starting reagents. SEM images showed that the fabricated powders were non-agglomerated and the particles sizes varied from single microns to tens of micrometers depending largely on the flux composition rather than the oxide(s)-to-flux ratio. In the presence of SiO2 in the flux, certain grains grew up to 300–400 μm. The lack of agglomeration and the large sizes of crystallites allowed making single crystal structural measurements and analysis on an undoped Lu2O3 obtained by means of the flux technique. The cubic structure with a = 10.393(2) Å, and Ia space group at 298 K was determined. The most efficient radioluminescence of Lu2O3:Eu powders reached 95%–105% of the commercial Gd2O2S:Eu.

show abstract

Effects of phase and chemical composition of precursor on structural and morphological properties of (Lu0.95Eu0.05)2O3 nanopowders

Cited by 20 publications

References 29 publications

Effect of starting materials and sintering temperature on microstructure and optical properties of Y2O3:Yb3+ 5 at% transparent ceramics

Effect of starting materials and sintering temperature on microstructure and optical properties of Y2O3:Yb3+ 5 at% transparent ceramics

Fabrication and laser operation of Yb:Lu₂O₃ transparent ceramics from co‐precipitated nano‐powders

Flux-Aided Synthesis of Lu2O3 and Lu2O3:Eu—Single Crystal Structure, Morphology Control and Radioluminescence Efficiency

Contact Info

Product

Resources

About

Effects of phase and chemical composition of precursor on structural and morphological properties of (Lu0.95Eu0.05)2O3 nanopowders

Cited by 20 publications

References 29 publications

Effect of starting materials and sintering temperature on microstructure and optical properties of Y2O3:Yb3+ 5 at% transparent ceramics

Effect of starting materials and sintering temperature on microstructure and optical properties of Y2O3:Yb3+ 5 at% transparent ceramics

Fabrication and laser operation of Yb:Lu2O3 transparent ceramics from co‐precipitated nano‐powders

Flux-Aided Synthesis of Lu2O3 and Lu2O3:Eu—Single Crystal Structure, Morphology Control and Radioluminescence Efficiency

Contact Info

Product

Resources

About

Fabrication and laser operation of Yb:Lu₂O₃ transparent ceramics from co‐precipitated nano‐powders