Volcanic tuff with 0.29% adsorbed H2O | GhoSST

Sample

Database

Experimentalists

Temperature: 243.1 $\pm$ 0.5 $K$
Temperature max: 443.0 $K$
Time at Tmax: 600.0 $min$
Comments: Sample temperature error is mostly due to possible vertical temperature gradient in the sample. Temperature reading accuracy and stability is 0.1K

Type

vacuum

Fluids

Fluid temperature

243.0 $\pm$ 5.0 $K$

Fluid pressure

1.0e-06 $\pm$ 1.0e-06 $mbar$

Comments

P/Ps = 0.000003 +/- 0.000003 - Fluid temperature error depicts estimated thermal gradient of gas in the cell

Publications

Number

Layers

Title

removal of adsorbed/interlayer water in sample by pumping and heating

Matters

Sample

Volcanic tuff with 0.29% adsorbed H2O (this sample)

Processing steps

Step	Chronology	Date	Type	Process	Changes
#1	after layer formation	2007-01-01	mechanical	sample slightly packed with a tamper to obtain a smooth surface with limited powder compaction under ambiant condition	limited compaction of the surface
#2	after sample formation	2007-01-01	thermal	the sample is heated at 443 K following a temperature ramp of 1 h while the chamber is open to air. After 1 h at 443 K, the chamber is closed and heating stops. Sample temperature decreases for a few hours to reach the temperature of the cold room (263 K).	removing of adsorbed/interlayer H2O
#3	after sample formation	2007-01-01	fluid physical	simulation chamber is slowly pumped down to pressure lower than $10^{-6}$ mbar	removing of adsorbed/interlayer $H_2O$. Air to vacuum (mostly residual $H_2O$ from sample)
#4	after sample formation	2007-01-01	thermal	under secondary vacuum, the sample is heated again at 446 K during a minimum of 10 h	removing of adsorbed/interlayer $H_2O$