Crystal Structure of the High-Pressure Phase in (CH₃)₂NH₂H₂PO₄

Abstract

Crystal structure of the high-pressure phase in (CH₃)₂NH₂H₂PO₄ was analyzed using X-ray diffraction data measured at p≅1.2 GPa and T=295(1) K. Lattice constants a=9.057 Å, b=9.468 Å, c=6.822 Å, α=93.25°, space group P2₁⁄b11, Z=4. Though half of PO₄ groups rotate by 50° through pressure-induced phase transition, hydrogen bonded chain structure of PO₄ along the b- and c-axes is preserved.