- Name
- Water ice particles 67±31μm containing 1wt% mineral mixture of Magnetite 63wt%, Antigorite 9wt%, Dolomite 6wt%, 0-36µm grains in inter-mixture and NH4-nontronite 22wt% in intra-mixture at 173 K
- Database
- Experimentalists
- Date
- 2019-04-23
- Thickness
- 20.0 $\pm$ 1.0 $mm$
- Diameter
- 48.0 $mm$
- Surface roughness
- smooth
- Sample changes
- The sample was measured under 0.14 mbar of dinitrogen (primary pumping only), just after its preparation and before the start of the sublimation of its surface.
- 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
- Fresh sample prepared just before the measurement.
- 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
- 0.14 $mbar$
- Number
- 1
- Layers
-
- Layer #1 , 20.0 $mm$
- Title
- Prepation of the sample: 1) Preparation of ice-nontronite particles 2) Mixing of these particles with the other mineral powders
- Matters
- Sample
- Water ice particles 67±31μm containing 1wt% mineral mixture of Magnetite 63wt%, Antigorite 9wt%, Dolomite 6wt%, 0-36µm grains in inter-mixture and NH4-nontronite 22wt% in intra-mixture at 173 K (this sample)
- Processing steps
-
Step Chronology Date Type Process Changes #1 before layer formation 2019-04-23 mixing We first prepared water ice particles containing 0.22wt% of NH4-nontronite. #2 before layer formation 2019-04-23 mixing We mixed the mineral powders with the ice particles containing 0.22wt% of NH4-nontronite in an aluminium bottle, pre-cooled with liquid nitrogen, using a vortex shaker. 0.178 g of mineral powder (81wt% magnetite (0.144g), 11wt% antigonite (0.020g) and 8wt% dolomite (0.014g)) was combined with 22.31 g of ice particles containing 0.22wt% of NH4-nontronite to obtain a 1wt% solid-to-ice mixture by weight. #3 before layer formation 2019-04-23 layer formation Inside the freezer, we sieved the ice-dust mixture (mesh size 400 µm) to fill the 2 cm-deep sample holder to the rim, smoothing the surface with a spatula. The holder and spatula had been pre-cooled with liquid nitrogen. - Comments
- It was first intended to produce water ice particles containing all the minerals (NH4-nontronite, magnetite, antigorite, dolomite) in an intra-mixture, but we failed at including the magnetite, antigorite and dolomite in the water suspension due to technical issues. Based on mass measurements, densities and physical properties, we hypothesized that the ice particles only contain NH4-nontronite. We then mixed these ice particles with the rest of the mineral powder, made of the remaining magnetite, antigorite and dolomite.