Thermodynamic properties of oxygen in yttrium-oxygen solid solutions

Okabe, Toru H.; Deura, T. N.; Oishi, Takao; Ono, Ken; Sadoway, Donald R.

doi:10.1007/bf02915613

Cited by 27 publications

(9 citation statements)

References 7 publications

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“…[21 The rare earth elements are expensive and not suitable as economic reductants. The Mg equilibrates thermodynamically with Ti containing about 2.5 mass pct oxygen, [3' 41 and the acid leaching of MgO is too slow for practical application.…”

Section: Introductionmentioning

confidence: 99%

Calciothermic reduction of titanium oxide in molten CaCl2

Suzuki

Inoue

2003

Metall Mater Trans B

122

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Titanium oxides were reduced to metallic titanium using the liquid calcium floating on the molten CaC12. A part of Ca dissolved into CaC12 and reacted with TiO2 settled below CaC12. The by-product CaO also dissolved by about 20 mol pct into CaC12, which was effective in reducing the oxygen concentration in the obtained Ti particles. The compositional region in the Ca-CaC12-CaO system was examined for the less oxygen contamination in Ti and the better handling in leaching. A large amount of the residual calcium oxidized the titanium powder in leaching. The metallic Ti powder less than 1000 mass ppm oxygen could be obtained only for 3.6 ks using 5 to 7 mol pct Ca-CaC12 at 1173 K. The powder was slightly sintered like sponge, and contained approximately 1500 ppm Ca. The anatase phase, the intermediate product in the refining process of TiO2, could be also supplied as raw material as well as rutile.

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Section: Introductionmentioning

confidence: 99%

Calciothermic reduction of titanium oxide in molten CaCl2

Suzuki

Inoue

2003

Metall Mater Trans B

122

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“…1 along with experimental data. [51][52][53][54] The experimental solvus, solidus, and liquidus relations are very well reproduced by calculation. Also, the calculated eutectoid and eutectic reactions are consistent with the experimental data.…”

Section: Y-o Binary Systemmentioning

confidence: 80%

“…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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“…However, no information exists on the magnitude of the oxygen activity in solid solutions of hydrogen and oxygen in titanium. The only available information correlates the content and the partial pressure of oxygen in the binary titanium/ oxygen system and the respective graph is reprinted on Figure 3 [23,24]. Comparison with Figure 1 reveals that the oxygen activity in such a phase would be too small to permit predominant proton conduction in the solid electrolyte.…”

Section: The Correlation Of Electrochemical and Thermodynamic Aspectsmentioning

confidence: 97%

“…Other common glass constituents, like the oxides . Partial molar Gibbs free energy and partial pressure of oxygen in the titanium/oxygen binary system at different temperatures in the range of low oxygen contents (Reproduced from Reference [23] with permission from the ASM International). of sodium, potassium, iron, zinc, lead and phosphorus also have to be avoided.…”

Section: The Sealing Materialsmentioning

confidence: 99%

The titanium/hydrogen system as the solid-state reference in high-temperature proton conductor-based hydrogen sensors

Schwandt

Fray

2006

J Appl Electrochem

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It has been demonstrated that a mixture of the solid solutions of hydrogen in a-titanium and b-titanium may be applied as a solid-state hydrogen reference electrode in conjunction with the high-temperature proton-conducting solid electrolyte CaZr 0:9 In 0:1 O 3Àd . The design and preparation of a sensor that incorporates this type of reference electrode are described, and coulometric titration experiments as well as cell voltage measurements are presented and discussed. The activity of the residual oxygen in the reference material has been identified as a critical parameter that needs to be controlled in order to ensure reliable and reproducible sensor performance. The impact of other impurities in the reference material is also considered.

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Thermodynamic properties of oxygen in yttrium-oxygen solid solutions

Cited by 27 publications

References 7 publications

Calciothermic reduction of titanium oxide in molten CaCl2

Calciothermic reduction of titanium oxide in molten CaCl2

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

The titanium/hydrogen system as the solid-state reference in high-temperature proton conductor-based hydrogen sensors

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