A useful approach to understand the origin of defects in transparent YAG ceramics

Picelli, Francesco; Biasini, Valentina; Hostaša, Jan; Piancastelli, Andreana; Esposito, Laura

doi:10.1557/s43579-022-00240-2

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Samples with a composition of 10 at.% Yb:YAG (Yb 0.3 Y 2.7 Al 5 O 12 ) were produced through reactive sintering in high vacuum furnace. The ceramic process is similar to the one reported in our previous work [25], with minor modifications, as reported in Table 1. The powders, TEOS, and the dispersant were dispersed in absolute ethanol with high purity (99.9%) alumina milling media in polyethylene bottles and mixed on a roller mill for 24 h at 80 rpm.…”

Section: Experimental Methodsmentioning

confidence: 81%

Beyond Scanning Electron Microscopy: Comprehensive Pore Analysis in Transparent Ceramics Using Optical Microscopy

Picelli,

Hostaša,

Piancastelli

et al. 2024

Ceramics

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Developing an effective method of quantifying defects in the bulk of transparent ceramics is a challenging task that could facilitate their widespread use as a substitute for single crystals. Conventionally, SEM analysis is used to examine the microstructure but it is limited to the material surface. On the other hand, optical transmittance assesses material quality, but does not provide information on the size and concentration of defects. In this study, we illustrate the use of a digital optical microscope for the non-destructive, precise, and rapid analysis of residual porosity in transparent ceramics. YAG-based ceramics doped with Yb have been selected for this study because they are used as laser gain media, an application that requires virtually defect-free components. Different production processes were used to produce YAG samples, and the digital optical microscope analysis was used to compare them. This analysis was shown to be effective and precise to measure the size and concentration of the residual pores. In addition, the comparison of samples obtained with different production processes showed that the size and distribution of the residual porosity is affected by the drying step of the powders before shaping by pressing, as well as by the sintering aids used to ease the densification. It also showed that the transmittance is influenced by both the total volume and the concentration of the pores.

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Section: Experimental Methodsmentioning

confidence: 81%

Beyond Scanning Electron Microscopy: Comprehensive Pore Analysis in Transparent Ceramics Using Optical Microscopy

Picelli,

Hostaša,

Piancastelli

et al. 2024

Ceramics

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“…One of the most important stages in the fabrication of optical ceramics is the compaction of nanoparticles to obtain bulk, mechanically unstressed compacts (green body) with a uniform density distribution [1]. It's well known that sintering activity of the nanoparticles increases with smaller size.…”

Section: Introductionmentioning

confidence: 99%

The Electrophoretic Deposition of Nanopowders Based on Yttrium Oxide for Bulk Ceramics Fabrication

Калинина

Иванов

2022

Inorganics

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In the present work, a study was carried out to investigate the key factors that determine the uniformity, mass, thickness, and density of compacts obtained from nanopowders of solid solutions of yttrium and lanthanum oxides ((LaxY1−x)2O3) with the help of the electrophoretic deposition (EPD). Nanopowders were obtained by laser ablation of a mixture of powders of yttrium oxide and lanthanum oxide in air. The implemented mechanisms of the EPD and factors of stability of alcohol suspensions are analyzed. It has been shown that acetylacetone with a concentration of 1 mg/m2 can be used as a dispersant for stabilization of isopropanol suspensions of the nanoparticles during the EPD. It was shown that the maximum density of dry compacts with a thickness of 2.4 mm reaches 37% of theoretical when EPD is performed in vertical direction from a suspension of nanopowders with addition of acetylacetone.

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Influence of Sulfate-Ion Additive at Different Stages of YAG: CR Ceramics Fabrication on the Optical Properties

Suprunchuk,

Kravtsov,

Tarala

et al. 2024

Glass Ceram

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A useful approach to understand the origin of defects in transparent YAG ceramics

Cited by 3 publications

References 19 publications

Beyond Scanning Electron Microscopy: Comprehensive Pore Analysis in Transparent Ceramics Using Optical Microscopy

Beyond Scanning Electron Microscopy: Comprehensive Pore Analysis in Transparent Ceramics Using Optical Microscopy

The Electrophoretic Deposition of Nanopowders Based on Yttrium Oxide for Bulk Ceramics Fabrication

Influence of Sulfate-Ion Additive at Different Stages of YAG: CR Ceramics Fabrication on the Optical Properties

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