Microstructure of the yttria doped Al2O3–ZrO2 eutectic fibers grown by the laser heated pedestal growth (LHPG) method

“…The seed used was a b-axis-grown undoped LN crystal fiber, previously produced by the LHPG approach and directed by X-ray Laue diffractometry. The choice of a b-axis-grown fiber as seed is due to earlier studies (ALRahman et al, 2013;Laidoune et al, 2013), showing that such type of material can double a laser material. The seed is 30 mm long and 0,8 mm diameter.…”

Section: Experimental Approach Lnmentioning

confidence: 99%

GROWTH OF YB<sup>3+</sup> DOPED LiNBO<sub>3</sub> CRYSTALS USING LASER HEATED PEDESTAL GROWTH METHOD

Boudour¹,

Boumaïza²,

Boudour³

2014

American Journal of Applied Sciences

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The growth of LN single crystals free from defects greatly doped with rare earth elements (RE 3+ ) and having a high optical quality is still an unresolved problem. Always, crystals of the niobate lithium contain a deficiency in lithium causing the appearance of intrinsic defects and thus a doping is required for the homogeneity. Our work was aimed to study the growth of Lithium niobate and their structural characterization, it focusses on congruent to stoichiometric Yb: LiNbO 3 (LN) crystals. These crystals were synthesized with different doping concentrations of Yb3+ (1.0, 2.0, 3.0, 4.0, 5.0 mol%) by the LHPG method which is faster, less expensive and clean, Three analysis techniques were used: Structural characterization made up 5.0 mol% by X-ray diffraction, Optical Microscopy and micro-Raman spectroscopy showed that the obtained material is single crystal, good optical quality and homogeneous. As we lnow, the results obtained with doping up to 5% are encouraging. Our approach provides excellent spectroscopic properties of crystals, low self-quenching property and can be used to applications such as solid-state laser.

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“…Generally, eutectic ceramic was mainly fabricated by directional solidification, including Bridgman, [9][10][11] micropulling down (μ-PD) methods, [12][13][14] edge-defined film-fed growth (EFG), 15 horizontal directional solidification method (HDS), 3 Laser floating zone (LFZ) [16][17][18][19] and so on. Bridgman and HDS can obtain larger-size bulk materials, but the eutectic structure usually is very coarse, which is mainly contributed to the low growth rate limited by low thermal gradient, consequently resulting in poor mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution of supra‐nanostructure Al₂O₃/ZrO₂ eutectic powders by combustion synthesis‐spray cooling

Zheng

Yang

et al. 2019

J Am Ceram Soc

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Eutectic powders with fine microstructure are difficult to synthesize by crushing eutectic bulk because of the damage of crystal structure and the introduction of milling media during preparation process. In this work, a novel combustion synthesis‐spray cooling (CSSC) method is developed to fabricate supra‐nanostructure Al2O3/ZrO2 eutectic powders. CSSC is a kind of self‐heating technique, which simplifies operations, reduces costs and supplies ultra‐high cooling rate. The phase composition and the microstructural evolution are investigated using experiment studies and ANSYS simulation. During the process, the t‐ZrO2 are stabilized at room temperature because of the solubility of Al2O3 in ZrO2. The ultra‐high cooling rate greatly refined eutectic structure. Although the eutectic structure coarsens with increases in particle size, the interphase spacing of all particles reaches supra nanoscale. The work provides a route for preparing supra‐nanostructure Al2O3/ZrO2 eutectic powders and for better understanding the microstructural evolution.

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Microstructure of the yttria doped Al2O3–ZrO2 eutectic fibers grown by the laser heated pedestal growth (LHPG) method

Cited by 14 publications

References 19 publications

Microstructure and crystallography of Al2O3–Y3Al5O12–ZrO2 ternary eutectic oxide grown by the micropulling down technique

Microstructure and crystallography of Al2O3–Y3Al5O12–ZrO2 ternary eutectic oxide grown by the micropulling down technique

GROWTH OF YB<sup>3+</sup> DOPED LiNBO<sub>3</sub> CRYSTALS USING LASER HEATED PEDESTAL GROWTH METHOD

Microstructural evolution of supra‐nanostructure Al₂O₃/ZrO₂ eutectic powders by combustion synthesis‐spray cooling

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Microstructure of the yttria doped Al2O3–ZrO2 eutectic fibers grown by the laser heated pedestal growth (LHPG) method

Cited by 14 publications

References 19 publications

Microstructure and crystallography of Al2O3–Y3Al5O12–ZrO2 ternary eutectic oxide grown by the micropulling down technique

Microstructure and crystallography of Al2O3–Y3Al5O12–ZrO2 ternary eutectic oxide grown by the micropulling down technique

GROWTH OF YB<sup>3+</sup> DOPED LiNBO<sub>3</sub> CRYSTALS USING LASER HEATED PEDESTAL GROWTH METHOD

Microstructural evolution of supra‐nanostructure Al2O3/ZrO2 eutectic powders by combustion synthesis‐spray cooling

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Microstructural evolution of supra‐nanostructure Al₂O₃/ZrO₂ eutectic powders by combustion synthesis‐spray cooling