Rb_3P_6N_(11) and Cs_3P_6N_(11)-New Highly Condensed Nitridophosphates by High-Pressure High-Temperature Synthesis

摘要

The nitridophosphates Rb_3P_6N_(11) and Cs_3P_6N_(11) were synthesized by the reaction of the respective alkali azides with P_3N_5 at 35 kbar and 1300 deg C using a multianvil assembly. HTe products were obtained as colorless crystalline powders.According to powder diffractometry it was obvious that Rb_3P_6N_(11) and Cs_3P_6N_(11) are isotypic to K_3P_6N_(11). The crystal structures were refined from powder diffraction data by the Rietveld method using the atomic coordinates of K_3P_6N_(11) as starting values (Rb_3P_6N_(11), P4_132, Z=4,#alpha#=1049.74(1) pm; Cs_3P_6N_(11), #alpha#=1065.15(1) pm).