Sample
Name
CO in alpha-N2 crystalline
Thickness
1.0 $\pm$ 0.01 $mm$
Surface roughness
very low
Substrate material
between 2 saphire windows 20mm diameter, 3mm thick
Comments
Generic sample of experiments of alpha N2 with different low CO concentrations: 0.45 and 4.2%
Temperature
35.0 $\pm$ 0.3 $K$
Temperature max
36.5 $\pm$ 0.1 $K$
Time at Tmax
12.0 $h$
Comments
Temperature error is mostly due to sample temperature gradient within the spot (1K/cm). Temperature maxi is the formation temperature (triple point): 63.15 +/- 0.05 K for 0.45% CO, 63.4 +/- 0.1 K for 4.2% CO
Type
molecular gas
Fluids
Title
Transformation of monocrystal of CO:beta-N2 solid solution in CO:alpha-N2 solid solution

Precursors

Produced sample

Sample
CO in alpha-N2 crystalline
Processing steps
Step Chronology Date Type Process Changes
#1 on parent sample 1992-01-01 thermal slow vertical phase change from CO:beta-N2 solid solution cooled below 35.6K for 0.45% CO (37.1K for 4.2% CO) under controled thermal gradient - P ~ 0.005 mbar - 15 min annealing near T(trans) transformation of monocrystal of CO:beta-N2 solid solution in CO:alpha-N2 solid solution (single phase) - no fractionation;perfect solid solution - CO:beta-N2 solid solution grown by crystallisation of CO (0.45 and 4.2%) dissolved in liquid N2 at 63.15K