Vapor pressure and heat of sublimation of tungsten
- 1 September 1965
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Vol. 69A (5), 417-421
- https://doi.org/10.6028/jres.069a.044
Abstract
The vapor pressure of tungsten was measured by the Langmuir method in the temperature range 2574 to 3183 °K using a vaccum microbalance. The least-squares line through the data, logP(atm) = 7.790-44680/T, yields a second law Δ H s ° (2850 °K) = 204.4 ±2.7 kcal/mol and Δ S s ° (2850 °K) = 35.64 ±0.97 cal/mol deg. Our recommended equation for the vapor pressure is logP(atm) = 7.933 - 45087/T based on our experimentally determined mean third law Δ H s ° (298 °K) =203.5 kcal/mol and tabulated values for the entropies and enthalpies.Keywords
This publication has 1 reference indexed in Scilit:
- Differences between the International Temperature Scales of 1948 and 1927Journal of Research of the National Bureau of Standards, 1949