Solid phase
- Official name
- Diammonium hydrogen phosphate (phase delta)
- Secondary names
- diazanium;hydrogen phosphate; Ammonium phosphate, dibasic; Dibasic ammonium phosphate; Phosphoric acid, diammonium salt; Diammonium orthophosphate; (NH4)2HPO4; (NH4)2HPO42-delta; H9N2O4P
- CAS number
- 7783-28-0
- Family
- ionic solid
- Class
- acid salt
- Compound type
- phosphate
- Formula
- (NH+4)2⋅HPO2−4
- Chemical formula
- (NH4)2HPO4
- Elemental formula
- (N+)2 H9 P O2 (O-)2
- Isotope mixture type
- terrestrial abundance
- Class
- acid salts (05)
- Type
- simple acid salts (05.01)
- Group
- phosphate (05.01.07)
- Phase name
- Diammonium hydrogen phosphate-delta
- Phase type
- crystalline
- Crystal system
- monoclinic
- Crystal class
- prismatic
- Crystal class symbol
- 2/m (C2h)
- Crystal spacegroup
- P2(1)/c
- Comments
- fully ordered phase
- Molar mass
- 115.109 g/mol
- State NTP
- solid
- Phase transitions
-
Phase transition type Other phases Temperature - Pressure solid-liquid liquid decompose 155 °C (428 K) solid-solid (NH4)2HPO4-gamma below -27°C (246 K) - Phase transitions comments
- disorder-less disorder phase trnasition at 246K
- Pure color
- colorless
- Color
- colorless, white
- Diaphaneity
- transparent to translucent