Layer
Name
Layer #1
Physical characteristics
Type of layer
granular
Thickness
4.5  ± 0.1  mm
Mass
1.165 ± 0.005 g
Texture
loose fine grained
Type of porosity
open pores
Porosity
0.428 ± 0.02
Density
1.017 ± 0.04 g.cm−3
Formation mode
solid-solid phase transition
Temperature
160.0  K
Comments
formed by cooling phase III to phase I at 110K and then warming above 160K
Number
1
Arrangement
single material
Materials
  Name Arrangement Mass (g) Mass fraction Abundance comments
Ammonium hydrogen sulphate-II powder 125-150µm 1.165 1.0 Certified purity > 98% for phase III. From X-ray powder diffraction analysis, the samples were pure without the presence of minor phases.