Layer
Name
Layer #1
Physical characteristics
Type of layer
granular
Thickness
4.5  $\pm$ 0.1  $mm$
Mass
1.165 $\pm$ 0.005 $g$
Texture
loose fine grained
Type of porosity
open pores
Porosity
0.428 $\pm$ 0.02
Density
1.017 $\pm$ 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.