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The composition and temperature dependence of the partial molar enthalpy of hydrogen in niobium

✍ Scribed by R Burch; N.B Francis

Publisher
Elsevier Science
Year
1975
Weight
555 KB
Volume
23
Category
Article
ISSN
0001-6160

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✦ Synopsis

Pressure-composition isotherms over the temperature range 622-l 122 K are presented for t,he niohiumhvdrogen system. From these data the partial molar enthalpy and relative partial molar enthalpy are derived. The pa&al molar ent.halpy is found t,o vary with temperature. and both enthalpy functions become more negative as the hydrogen content, is increased, the variation being about 100 kJ (mole H,)-I. It in shown t,hat these variations in the enthalpy cannot be interpreted solely as an interaction between hydrogen at,oms. It, is postulat,ed that there is, m addition, an elect,ronic interaction.

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The standard molar atomization enthalpy
The standard molar atomization enthalpy and the standard molar enthalpy of formation of gaseous Si2N from high-temperature mass spectrometry
✍ R. Viswanathan; R.W. Schmude Jr.; K.A. Gingerich πŸ“‚ Article πŸ“… 1995 πŸ› Elsevier Science 🌐 English βš– 380 KB

A high-temperature mass-spectrometric study of the vaporization of (silicon+boron nitride) from a boron-nitride Knudsen cell was conducted in the temperature range T = 1688 K to 1921 K. The partial pressures of Si(g), Si2(g), N2(g), and Si2N(g) were determined. The dissociation reaction: Si2N(g)=2Si