Constituent
Name
Ammonium biphosphate (phase PE)
Official name
Ammonium dihydrogen phosphate (phase PE)
Family
ionic solid
Class
acid salt
Compound type
phosphate
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass
0.397 $\pm$ 0.002 $g$
Mass fraction
1.0
Mole fraction
1.0
Chemical composition
Formula
$(NH_4^+) \cdot H_2PO_4^-$
Chemical formula
(NH4)H2PO4
Elemental formula
(N+) H6 P O3 (O-)
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$NH_4^+$ Ammonium ion molecule 1 0.5 1 constituent cation main
$H_2PO_4^-$ Dihydrogen phosphate ion molecule 1 0.5 1 constituent anion main
Chemical functions
  Function Number
$H_4 >\mid N^+$ 1
Chemical bonds
  Bond Number Relevance
$-O \dots H-$ 6
$\geq N^+-H$ 4 main
$=P-O^-$ 2 main
$\eqslantgtr P-O<$ 2 main
$P=O$ 1 main
$-O-H$ 2 main
Class
acid salts (05)
Type
simple acid salts (05.01)
Phase name
PE-(NH4)H2PO4
Phase type
crystalline
Crystal system
tetragonal
Crystal class
scalenohedral
Crystal class symbol
-42m (D2d)
Crystal spacegroup
I-42d
Comments
H atoms are dynamically disordered between two equivalent sites about the bond center
Texture
monocrystalline
Molar mass
115.025 $g/mol$
Density
1.799 (calc.: 1.852 @155K) $g/cm^3$
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.0462
Refraction index $n_{\alpha}$
1.5277 @532nm
Refraction index $n_{\beta}$
1.4815 @532nm
Color
colorless, white
Diaphaneity
transparent to translucent
Luster
vitreous