Rare earths. IV. Dissociation energies of the gaseous monoxides of the rare earths

Ames, L. L.; Walsh, Patrick N.; White, David P.

doi:10.1021/j100867a049

Cited by 156 publications

(84 citation statements)

References 2 publications

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“…Thermodynamic data [51,52,[55][56][57] were also considered in this optimization. The vapor pressure of yttrium monoxide over a solid yttrium sesquioxide and the calculated vapor Section I: Basic and Applied Research pressure of yttrium over the liquid containing unsaturating and saturating amounts of sesquioxide were calculated and compared with experimental data [51,52,[55][56][57] (Fig.…”

Section: Y-o Binary Systemmentioning

confidence: 99%

Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

Pan

Fabrichnaya

Seifert

et al. 2010

J. Phase Equilib. Diffus.

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A thermodynamic dataset for the Si-C-Al-Y-O system was developed for calculations of heterogeneous phase equilibria and reactions in SiC-base engineering ceramics. The quinary system is of major interest for the understanding of the liquid phase sintering of silicon carbide ceramics using additives like alumina (Al2O3) and yttria (Y2O3). The thermodynamic dataset was developed by the CALPHAD method of thermodynamic optimization. Analytical descriptions for the Gibbs free energy functions of all phases in the Si-C-Al-Y-O system were assessed. The sublattice model using the compound energy formalism was used for the treatment of the solid phases. The liquid phase was described by using the partially ionic liquid model presented as (Al3+, Si4+, Y3+)(P)(O2-, SiO4 (4-), Va, AlO3/2, SiO2, C)(Q), which covers metallic liquid and oxide liquid as a single phase

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Section: Y-o Binary Systemmentioning

confidence: 99%

Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

Pan

Fabrichnaya

Seifert

et al. 2010

J. Phase Equilib. Diffus.

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“…There is an increasing volume of data which suggests that a ratio less than (8,17) 1.0 may be closer to the true value.…”

Section: Gd S(s)mentioning

confidence: 99%

“…Here the ground state degeneracies for YS(g and PrS(g) are taken to be 2 and 4 respectively, the same as those used for (8) YO(g) and PrO(g) The results are listed in appendix 2…”

Section: Ys-pr Smentioning

confidence: 99%

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MASS SPECTROMETRIC DETERMINATION OF DISSOCIATION ENERGIES OF PrS, GdS, AND PrO.

Fries¹,

Cater²

1969

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“…The volatility diagram of the Y-O system was drawn using the thermodynamic data compiled by Brain18) and reported by Ackermann et al 19),20) and Ames et al 21) and its thermodynamical stability in the temperature range of 1800 to 2000K was discussed in this investigation. The SiO2-Y2O3-Al2O3 glass was prepared and was heat-treated at 2023K to compare the stability of SiO2, Y2O3 and Al2 in the glass at this high temperature.…”

Section: Introductionmentioning

confidence: 99%

Solid-Gas Reaction during Sintering of Si3N4 Ceramics. (Part 1). Stability of SiO2, Y2O3 and Al2O3 at High Temperature.

Yokoyama

Wada

2000

J. Ceram. Soc. Japan

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The stability during sintering of SiO2, Y2O3 and Al2O3, well known as sintering aids of Si3N4 ceramics, was examined from both thermodynamical and experimental aspects. Both the heat treatment of SiO2-Y2O3 Al2O3 glass and the sintering of Si3N4 ceramics were carried out. In the thermodynamical considerations , the stability of the glass composition was discussed on the basis of known volatility diagrams for SiO2, Al2 and MgO and the thermodynamic data of Y2O3 available in the literature. The results suggest that Y2O3 is the most stable among all materials in the sintering temperature range usually selected for Si3N ceramics. SiO2-Y2O3-Al2O3 (equi-mass%) glass was heat-treated in a BN sagger at 2023K for 2h in N2 gas of 0.1 MPa. Si3N with addition of 5 mass% Y2O3 and 3 mass% Al2O3 was sintered in the BN sagger at 2023K for 0 to 16h in N2 gas of 0.1MPa. The elemental contents in the glass and ceramics before and after heat treatment and sinter ing were determined by chemical analysis. As a result, it was found that only SiO2 in the glass and SiO2 and Si3N4 in the Si3N4 ceramics vaporized. On the other hand, the Y2O3 and Al2O3 contents in both the glass and Si3N4 ceramics did not decrease under the selected temperature.

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Rare earths. IV. Dissociation energies of the gaseous monoxides of the rare earths

Cited by 156 publications

References 2 publications

Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

MASS SPECTROMETRIC DETERMINATION OF DISSOCIATION ENERGIES OF PrS, GdS, AND PrO.

Solid-Gas Reaction during Sintering of Si3N4 Ceramics. (Part 1). Stability of SiO2, Y2O3 and Al2O3 at High Temperature.

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