Layer
Name
Layer #1
Physical characteristics
Type of layer
granular
Thickness
4.5  ± 0.1  mm
Mass
0.606 ± 0.005 g
Texture
loose fine grained
Type of porosity
open pores
Porosity
0.673 ± 0.02
Density
0.529 ± 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 80-125µm 0.606 1.0 Certified purity > 99% for phase delta. From X-ray powder diffraction analysis, the samples were pure without the presence of minor phases.