The sodium–barium phase diagram

Addison, C. C.; Creffield, Geoffrey K.; Hubberstey, Peter; Pulham, R. J.

doi:10.1039/j19710002688

Cited by 9 publications

(3 citation statements)

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“…The equation of the line is In SGe "-2.657 --4.837/T [9] where T is the absolute temperature in degrees Kelvin. The enthalpy, AHGe(SOI), and entropy, ASGe(SO1), of solution can be computed from the solubility data using the relationship ~-/Ge (sol) ASGe (sO1) In See -'-~ [10] RT R…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, we chose the dilute region for detailed investigation. A further impetus for studying the properties of dilute solutions was provided by our continuing interest (6)(7)(8)(9)(10)(11) in the nature of solutes dissolved in liquid metals at concentrations where interactions between the solute atoms are less important than those between the solute and solvent.…”

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confidence: 99%

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Thermodynamic Properties of Solutions of Group IV Metals Dissolved in Liquid Sodium

Hubberstey¹,

Castleman²

1972

J. Electrochem. Soc.

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An emf cell technique was used to measure the thermodynamic properties of Pb-Na solutions at temperatures ranging from 245 ~ to 500~ and compositions between 2.35 and 16.79 atomic per cent (a/o) Pb. The results, while in general agreement with earlier work, reveal that the deviations from ideal solution behavior cross over from negative to positive at low Pb concentrations. This property has not been previously reported for the Pb-Na system. Sodium activity measurements, which were made as a function of decreasing temperature, display a marked change in slope upon transition to a two-phase region. The resulting liquidus-line is in agreement with the published phase diagram. A study of the change in sodium activity as a function of temperature was also made for saturated solutions of Ge in Na. The results show that the solubility of Ge in Na is represented by the equation

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Thermodynamic Properties of Solutions of Group IV Metals Dissolved in Liquid Sodium

Hubberstey¹,

Castleman²

1972

J. Electrochem. Soc.

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“…The free energy of formation of Na2Mo3OG could be estimated from the conditions of its formation and decomposition reactions [11], [19], and [20] (10,(20)(21)(22). The hGf's of Na3MoO4,'NaMoeO17, and NaMoO2, were estimated in the same way from the conditions described for reactions [13] and its reverse, reaction [9], and reaction [14] and its reverse (22)(23)(24)(25)(26). Temperature dependences of AG~ were estimated from similar compounds such as Na2MoO4, MOO3, and MoO2 (12).…”

Section: X-ray Diffraction Studies Of Amtec Electrodes--tablementioning

confidence: 99%

The Role of Oxygen in Porous Molybdenum Electrodes for the Alkali Metal Thermoelectric Converter

Williams

Nagasubramanian²,

Khanna³

et al. 1986

J. Electrochem. Soc.

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The alkali metal thermoelectric converter is a direct energy conversion device, utilizing a high alkali metal activity gradient to generate electrical power. Its operation is based on the unique ion conductive properties of beta″‐alumina solid electrolyte. The major barrier to application of this device is identification of an electrode which can maintain optimum power densities for operation times of >10,000h. Thin, porous molybdenum electrodes have shown the best performance characteristics, but show a variety of time dependent phenomena, including eventual degradation to power densities 3–5 times lower than initial values. Several Na‐Mo‐O compounds, including Na2MoO4 and Na2Mo3O6 , are formed during AMTEC operation. These compounds may be responsible for enhanced Na transport through Mo electrodes via sodium ion conduction, and eventual performance degradation due to their volatilization and decomposition. No decomposition of beta″‐alumina has been observed under simulated AMTEC operating conditions up to 1373 K. In this paper, we present a model for chemical reactions occurring in porous molybdenum electrodes. The model is based on thermochemical and kinetic data, known sodium‐molybdenum‐oxygen chemistry, x‐ray diffraction analysis of molybdenum and molybdenum oxide electrodes, and the electrochemical behavior of the cell.

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Formation of Alloys Between Group‐IA and Group‐IIA Elements

Pulham¹

1991

Inorganic Reactions and Methods

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The sodium–barium phase diagram

Cited by 9 publications

References 0 publications

Thermodynamic Properties of Solutions of Group IV Metals Dissolved in Liquid Sodium

Thermodynamic Properties of Solutions of Group IV Metals Dissolved in Liquid Sodium

The Role of Oxygen in Porous Molybdenum Electrodes for the Alkali Metal Thermoelectric Converter

Formation of Alloys Between Group‐IA and Group‐IIA Elements

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