Sample
Name
Sublimation residue made of mineral mixture (Magnetite 63wt%, NH4-nontronite 22wt%, Antigorite 9wt%, Dolomite 6wt%) at 173 K
Database
Experimentalists
Date
2019-04-28
Sublimation residue (4.8 cm in diameter) made of mineral mixture (Magnetite 63wt%, NH4-nontronite 22wt%, Antigorite 9wt%, Dolomite 6wt%) inside the CarboNIR vacuum chamber at 173 K. Low resolution image.
Sublimation residue (4.8 cm in diameter) made of mineral mixture (Magnetite 63wt%, NH4-nontronite 22wt%, Antigorite 9wt%, Dolomite 6wt%) inside the CarboNIR vacuum chamber at 173 K. High resolution image. Grazing illumination enables to appreciate the surface roughness.
Sublimation residue made of mineral mixture (Magnetite 63wt%, NH4-nontronite 22wt%, Antigorite 9wt%, Dolomite 6wt%) after warming at room temperature and collection. The residue was collected with a spatula and deposited on cotton wool.
Sublimation residue observed with an optical microscope. The image shows pale porous spheres of NH4-nontronite embedded in a grey matrix of other mineral grains.
Sublimation residue observed with a Scanning Electron Microscope (SEM). The image shows a porous sphere of NH4-nontronite.
Physical characteristics
Thickness
0.9 $\pm$ 0.1 $mm$
Diameter
48.0 $mm$
Surface roughness
sligthly rough
Substrate material
black aluminum tape
Substrate comments
Cylindrical container of 4.8 cm diameter and 2.0 cm depth, which had been coated with black matte aluminum tape on the inside.
Comments
The thickness of the dry sublimation residue was measured with a ruler to be slightly less than 1 mm.
Temperature
173.0 $K$
Temperature max
173.0 $K$
Type
vacuum
Fluid pressure
1.5e-06 $mbar$
Comments
The sample was kept under high vacuum
Pressure
1.5e-06 $mbar$
Comments
The surface of the sample absorbs thermal infrared radiation emitted from the top and the walls of the vacuum chamber, so the water ice sublimates progressively.
Publications
Number
1
Layers