Synthesis of a mixed-rare-earth aluminum garnet solid solution

Santos, Claudinei dos; Daguano, J.K.M.F.; Rodrigues, Durval; Suzuki, Paulo Atsushi; Santos, Felipe Antunes; Silva, O.M.M.

doi:10.1016/j.matlet.2012.09.100

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…Where: A is the Y 3 Al 5 O 12 molar's fraction, B is the Al 2 O 3 molar's fraction, 400 HV is the Y 3 Al 5 O 12 100% dense hardness [18,19], and 1800 HV is the Al 2 O 3 100% dense hardness [20].…”

Section: Hardness Evaluationmentioning

confidence: 99%

Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Paneto¹,

Pereira²,

Lima³

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Section: Hardness Evaluationmentioning

confidence: 99%

Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Paneto¹,

Pereira²,

Lima³

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…5a) shows three sharp bands of clear extremes appearing at * 308, 344 and 560 cm -1 and one broad band in the wavenumber range 540-356 cm -1 with an inflection point at * 500 cm -1 . These bands can be assigned to the stretching vibrations of Y-O in the deformed YO 6 octahedra [17][18][19][20][21][22][23][24][25][26]. In the IR spectra of the obtained solid solution Y 2-x Yb x O 3 ( Fig.…”

Section: Resultsmentioning

confidence: 94%

“…The study of the oxide system Y 2 O 3 -Yb 2 O 3 was begun with preparation of nine mixtures of Y 2 O 3 and Yb 2 O 3 of the compositions specified in Table 1, selected to represent different ranges of concentration of the system's components. The mixtures of isostructural oxides Y 2 O 3 and Yb 2 O 3 [13][14][15][16][17][18][19][20][21][22][23][24][25][26], after preliminary homogenization in an agate mortar, were subjected to mechanochemical synthesis in a high-energy ball milling, under air atmosphere, in a few 3-h long stages. According to XRD studies of all samples, only samples no.…”

Section: Resultsmentioning

confidence: 99%

“…5bd), the absorption bands appear in almost the same ranges of wavenumbers, from 650 to 300 cm -1 , but they are broadened and their maxima are poorly marked at 564, 416 and 344 cm -1 (for x = 0.5), 568, 428 and 344 cm -1 (for x = 1.0) and at 576, 432 and 344 cm -1 (for x = 1.5). The bands can be assigned to the stretching vibrations of Yb-O and Y-O bonds, either symmetric or asymmetric, in the octahedra of YbO 6 and YO 6 [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. With increasing number of Yb 3?…”

Section: Resultsmentioning

confidence: 99%

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Mechanochemical synthesis and thermal stability of phases in the Y2O3–Yb2O3 system

Piz

Filipek

Jabłoński

2019

J Therm Anal Calorim

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Substitutional, continuous solid solution of the general formula Y 2-x Yb x O 3 was obtained from the mixture of Y 2 O 3 and Yb 2 O 3 oxides, for the first time by the mechanochemical method in a high-energy ball milling. The monophasic samples of nanocrystalline solid solution for x [ 0.00 and x \ 2.00 were examined by the methods: XRD, DTA, SEM, IR and UV-Vis-DR. As follows from the results, the solid solution crystallizes in cubic system and is isostructural with Y 2 O 3 and Yb 2 O 3. The solution is stable in the air atmosphere up to at least 900°C, and its decomposition temperature decreases with the increase in x, that is, with decreasing number of Yb 3? ions replacing Y 3? ions in the crystal lattice of Y 2 O 3. The energy band gap estimated for the solid solution varies from * 5.30 eV for x = 0.50 to * 4.90 eV for x = 1.50, which means that it is an insulator.

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“…S2g, ESI †), the Y-O bond lengths are within the range of 2.24-2.48 Å, which covers the Y-O bond length shown in Y 2 O 3 (B2.35 Å). 68 The longest Y-O bonds are believed to be responsible for the interface instability.…”

Section: Effects Of Single Re On the Adhesion Of Al 2 O 3 /Nial Inter...mentioning

confidence: 99%

Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al₂O₃/NiAl interface

Zhang

Legut

et al. 2016

Phys. Chem. Chem. Phys.

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The profound effects of reactive elements (REs) on the adhesion energy and adhesive strength of the α-Al2O3/β-NiAl interface in thermal barrier coating (TBC) systems have attracted increasing attention because RE-doping has played a significant role in improving the thermal cycling lifetime of TBCs. However, the fundamental mechanism is, so far, not well understood due to the experimental difficulty and theoretical complexity in interface modelling. For this purpose, in the present study we have performed comprehensive density functional theory calculations and information targeted experiments to underline the origin of the surprising enhancement of interface adhesion, stability and mechanical strength of the α-Al2O3/β-NiAl interface by different RE doping levels. Our results suggest that the interface failure firstly appears within the NiAl layer adjacent to the Al-terminated oxide under mechanical loading, while the formation of O-RE-Ni bond pairs at the interface can effectively hinder the interface de-cohesion, providing a higher mechanical strength. By comparing several typical REs, it is observed that Hf can emerge not only with the highest interface adhesion energy, but also the highest mechanical strength; in agreement with our experimental results. By continuously increasing the dopant concentration, the strengthening effect may increase correspondingly, but is limited by the solute solubility. These results shed light into the effect of REs on the stability and strength of the α-Al2O3/β-NiAl interface, providing theoretical guidance for interface design via a combinational analysis of bond topology and electronic structure.

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Synthesis of a mixed-rare-earth aluminum garnet solid solution

Cited by 5 publications

References 8 publications

Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Mechanochemical synthesis and thermal stability of phases in the Y2O3–Yb2O3 system

Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al₂O₃/NiAl interface

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Synthesis of a mixed-rare-earth aluminum garnet solid solution

Cited by 5 publications

References 8 publications

Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Mechanochemical synthesis and thermal stability of phases in the Y2O3–Yb2O3 system

Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al2O3/NiAl interface

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Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al₂O₃/NiAl interface