Layer
Name
Layer #1
Physical characteristics
Type of layer
granular
Thickness
4.5  $\pm$ 0.1  $mm$
Mass
0.614 $\pm$ 0.005 $g$
Texture
loose fine grained
Type of porosity
open pores
Porosity
0.669 $\pm$ 0.02
Density
0.536 $\pm$ 0.025 $g.cm^{-3}$
Formation mode
solid-solid phase transition
Temperature
174.0  $K$
Comments
formed by cooling phase delta to phase beta at 110K and then warming above 174K
Number
1
Arrangement
single material
Materials
  Name Arrangement Mass (g) Mass fraction Abundance comments
Ammonium hydrogen phosphate-gamma powder 32-80µm 0.614 1.0 Certified purity > 99% for phase delta. From X-ray powder diffraction analysis, the samples were pure without the presence of minor phases.