title: Structure of intermediate phase II of LiNH2 under high pressure.
abstract: A new intermediate phase (phase II) was found between phases I and III in LiNH2 in the pressure range of 10 to 13 GPa through the analysis of infrared and powder X-ray diffraction measurements to 25 GPa at room temperature. This result agreed with the prediction of a stable phase between phases I and III through theoretical calculations. Powder X-ray diffraction measurement and DFT calculation showed that this phase has a monoclinic structure with space group C2/c (Z = 8), which is the same structure as that of a slightly tilted crystal lattice of the Fddd structural model. The enthalpy of the C2/c structure was also found to be almost the same as that of the Fddd structure.
authors: National Institute of Advanced Industrial Science and Technology (AIST) , AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors: Hiroshi
authors: H
authors: Yamawaki
authors: Hiroshi
authors: H
authors: Fujihisa
authors: Yoshito
authors: Y
authors: Gotoh
authors: Satoshi
authors: S
authors: Nakano