JANAF Thermochemical Tables, 1974 Supplement

Chase, M. W.; Curnutt, J. L.; Hu, Andrew Teh; Prophet, H.; Syverud, A. N.; Walker, Lynn C.

doi:10.1063/1.3253143

Cited by 368 publications

(87 citation statements)

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“…Potassium salts were used in preference to sodium salts to avoid precipitation of NaOH -2PbC03, which is less soluble than KOH.2PbC03 (19). The PbO reagent was a mixture of litharge and massicot; this was adequate for most purposes, since their Gibbs energies of formation differ by only about 1 kJ mol-' (20,21). Samples of litharge and massicot were collected whenever they were obtained as pure reaction products.…”

Section: Methodsmentioning

confidence: 99%

Stability and solubility relationships between some solids in the system PbO–CO₂–H₂O

Taylor¹,

Lopata²

1984

Can. J. Chem.

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PETER TAYLOR and VINCENT J. LOPATA. Can. J. Chem. 62, 395 (1984).We have determined equilibrium conditions for each reaction in the solid interconversion sequence PbO = PbloO(OH)6(C03)6 (plumbonacrite) E Pb3(OH)Z(C03)Z (hydrocerussite) = PbC03 (cerussite), in aqueous carbonate solutions near 25°C. Our data yield the following Gibbs energies of formation from the elements, bfG0(298.15 K): plumbonacrite, -53 10 * 3 1 kJ mol-I; hydrocerussite, -1705 * 1 1 kJ mol-I; cerussite, -628.0 ? 3.9 kJ mol-' . Corresponding estimated values of ArG0(373 K) are -5120 2 50, -1643 * 18, and -612 * 9 kJ mol-', respectively. We have demonstrated the existence of a narrow stability field for plumbonacrite, and convenient small-scale preparations of hydrocerussite and plumbonacrite are described. Gibbs energy data for the solids have been combined with selected data for aqueous lead species in a detailed computation of solubility behaviour for this system at 25°C. [Traduit par le journal]

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Section: Methodsmentioning

confidence: 99%

Stability and solubility relationships between some solids in the system PbO–CO₂–H₂O

Taylor¹,

Lopata²

1984

Can. J. Chem.

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“…At the surface of the droplet, the observed O 2 (g) bubble radii (r ) are of the order 250 μm and the surface tension γ of molten 54 and measured values for U o shown in Figure 5, μ Al is determined from the resulting expression derived from Eq. 14…”

Section: Significance Of Umentioning

confidence: 99%

Electrochemical Study of a Pendant Molten Alumina Droplet and Its Application for Thermodynamic Property Measurements of Al-Ir

Nakanishi

Allanore

2017

J. Electrochem. Soc.

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Limited knowledge of the thermodynamic and transport properties of refractory materials in the liquid state remains a key challenge limiting their application. Using alternating current (AC) and direct current (DC) techniques, the electrochemical kinetics of oxygen evolution and metal deposition was investigated in a pendant droplet of molten alumina (Al 2 O 3 ) with three iridium (Ir) electrodes in a thermal imaging furnace. For the first time, the direct electrolytic decomposition of molten Al 2 O 3 to oxygen gas and aluminum ( Structural materials developed for lasers, nuclear, aerospace or materials processing are required to sustain high temperature, and therefore often rely on solid refractory materials, e.g. iridium-based superalloys exhibiting exceptional corrosion and creep resistance.

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“…All thermodynamic constants for the compounds of interest were obtained from the literature, except for the heat capacity Cp(T) coefficient for Li 2 CO 3 . In this case, the data on heat capacity in Chase et al (1974) were fitted to the function: Cp(T) = k 0 + k 1 T -0.5 + k 2 T -2 + k 3 T -3 (Berman & Brown 1985) using the computer program Table Curve. The heat capacity of Li 2 CO 3 was then calculated as: Cp(T) = 866.992 -221.036•10 2 T -0.5 + 878.062•10 5 T -2 -1268.38•10 7 T -3 .…”

Section: Thermodynamic Analysismentioning

confidence: 99%

THE OCCURRENCE AND ORIGIN OF ZABUYELITE (Li2CO3) IN SPODUMENE-HOSTED FLUID INCLUSIONS: IMPLICATIONS FOR THE INTERNAL EVOLUTION OF RARE-ELEMENT GRANITIC PEGMATITES

Anderson

Clark

Gray

2001

The Canadian Mineralogist

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Solid -liquid -vapor fluid inclusions in spodumene in rare-element granitic pegmatites commonly contain one or more highbirefringence minerals. Optical examination and laser Raman spectroscopic analyses of over 500 crystal-rich fluid inclusions in spodumene from Bikita and Kamativi, Zimbabwe, and Bernic Lake (Tanco), Manitoba, indicate that the high-birefringence phase is zabuyelite (Li 2 CO 3 ). Laser Raman spectra were also obtained from fluid inclusions in a wafer of spodumene from the Tanco pegmatite reported to contain the type samples of diomignite (Li 2 B 4 O 7 ). In every fluid inclusion, the high-birefringence phase was shown to be zabuyelite; no phase yielding the Raman spectrum of Li 2 B 4 O 7 was observed. Petrographic analysis indicates that the inclusions are secondary in origin and are trapped within healed fractures and cleavage planes. Essentially all fluid inclusions exhibit extensive necking after the crystallization of solid phases. The dominant solid phases are quartz and zabuyelite. Other minerals such as cookeite, calcite, a cesium-rich phase, apatite and several unidentified minerals were found in fewer than 5% of the fluid inclusions examined. An estimate of the bulk composition of the fluid entrapped within spodumene at Tanco was obtained by averaging the contents of several hundred coeval fluid inclusions, and the composition of individual fluid inclusions was determined using laser Raman spectroscopy, synchrotron X-ray fluorescence and laser ablation -inductively coupled plasma -mass spectrometry. The results indicate that the inclusions in spodumene, like those in the quartz component of SQUI, entrapped a low-salinity (ca. 7 wt.% NaCl equiv.), alkali-rich, aqueous carbonic fluid. We propose that the solid -liquid -vapor inclusions in spodumene from Tanco, Bikita and Kamativi are the products of a reaction between the low-density aqueous carbonic fluid and the host spodumene during the late stages of pegmatite evolution; therefore, they do not represent the products of a complex borosilicate melt as suggested previously.

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JANAF Thermochemical Tables, 1974 Supplement

Cited by 368 publications

References 0 publications

Stability and solubility relationships between some solids in the system PbO–CO₂–H₂O

Stability and solubility relationships between some solids in the system PbO–CO₂–H₂O

Electrochemical Study of a Pendant Molten Alumina Droplet and Its Application for Thermodynamic Property Measurements of Al-Ir

THE OCCURRENCE AND ORIGIN OF ZABUYELITE (Li2CO3) IN SPODUMENE-HOSTED FLUID INCLUSIONS: IMPLICATIONS FOR THE INTERNAL EVOLUTION OF RARE-ELEMENT GRANITIC PEGMATITES

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JANAF Thermochemical Tables, 1974 Supplement

Cited by 368 publications

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Stability and solubility relationships between some solids in the system PbO–CO2–H2O

Stability and solubility relationships between some solids in the system PbO–CO2–H2O

Electrochemical Study of a Pendant Molten Alumina Droplet and Its Application for Thermodynamic Property Measurements of Al-Ir

THE OCCURRENCE AND ORIGIN OF ZABUYELITE (Li2CO3) IN SPODUMENE-HOSTED FLUID INCLUSIONS: IMPLICATIONS FOR THE INTERNAL EVOLUTION OF RARE-ELEMENT GRANITIC PEGMATITES

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Stability and solubility relationships between some solids in the system PbO–CO₂–H₂O

Stability and solubility relationships between some solids in the system PbO–CO₂–H₂O