Thermodynamics of Nonstoichiometric Nickel Tellurides. II. Dissociation Pressures and Phase Relations of Tellurium-Rich Compositions

Journal Article · Wed Oct 01 04:00:00 EDT 1958 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.1744597· OSTI ID:4324115

Westrum, Edgar F.; Machol, R. E.

Dissociation pressures of tellurium over liquid and solid nickel telluride solutions have been measured with a silica Bourdon gauge at compositions corresponding to NiTe_1.5, NiTe_1.7, NiTe_1.9, NiTe_2.0, and NiTe₉ at temperatures up to 780°. Modifications of the manometric technique are described which permit accuracies of 0.1 mm pressure and 0.1° at high temperatures with corrosive substances where the pressure is sensitive to impurities or to composition changes. Finally, the results, together with data on the vapor pressure of pure tellurium, define the partial molal free energies and entropies of tellurium and, together with direct eutectic temperature measurement, delineate features of the phase diagram for compositions with more than 60 atomic percent tellurium.

• Research Organization: Univ. of Michigan, Ann Arbor
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-001997
• OSTI ID: 4324115
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 4 Vol. 29; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ENTROPY
ERRORS
EUTECTICS
FREE ENERGY
INSTRUMENTS
LABORATORY EQUIPMENT
LIQUIDS
MEASURED VALUES
NICKEL COMPOUNDS
PHASE DIAGRAMS
PRESSURE
QUANTITY RATIO
SILICON OXIDES
SOLIDS
TELLURIDES
TELLURIUM
TEMPERATURE
THERMODYNAMICS