RI 6367 Vapor Pressure of Tungsten (VI) Chloride and Hafnium (IV) Iodide by a Metal Diaphragm Technique
- Organization:
- The National Institute for Occupational Safety and Health (NIOSH)
- Pages:
- 38
- File Size:
- 2602 KB
- Publication Date:
- Jan 1, 1964
Abstract
The vapor pressures of tungsten (VI ) chloride ( WC1 ) and hafnium ( IV )
iodide ( HFI ) were measured by a metal diaphragm technique . Vapor pressure
values were obtained to permit calculation of the thermodynamic properties
of the vaporization processes of the compounds .
The vapor pressure data of WC16 are represented by the following equations
for the liquid , B - solid , and a- solid over the temperature intervals
indicated :
-
log P = 8.194
3,253 /T
Liquid , 281.5 ° to 325 ° C :
B - solid 230.0 ° to 281.5 ° C : log P
a - solid 185.0 ° to 230.0 ° C : log Pam
***
=
8.794 - 3,588 / T
= 9.615 - 3,996 /T
where T is the absolute temperature in degrees Kelvin . The heats of vaporization
and sublimation are 14.9 , 16.4 , and 18.3 kcal / g mole , respectively .
The entropy of vaporization at the normal boiling point , 330 ° C , was 24.3 eu .
The fusion temperature , 281.5 ° C , and transition temperatures , 230.0 ° and
185 ° C , were found by thermal analysis .
Citation
APA: (1964) RI 6367 Vapor Pressure of Tungsten (VI) Chloride and Hafnium (IV) Iodide by a Metal Diaphragm Technique
MLA: RI 6367 Vapor Pressure of Tungsten (VI) Chloride and Hafnium (IV) Iodide by a Metal Diaphragm Technique. The National Institute for Occupational Safety and Health (NIOSH), 1964.