Sodium Holmium Polyphosphate NaHo(PO3)4 with P4O124-Spiral Chains: Synthesis, Crystal Structure,and Luminescent Properties

摘要

Sodium holmium polyphosphate crystal, NaHo(PO3)4, has been synthesized by the high temperature solution reaction and characterized by X-ray diffraction analysis, EDX, IR, UV-vis-NIR, and PL spectra. The structure belongs to the monoclinic system, space group P21/n with Z = 4, a = 7.181(3), b = 13.059(5) and c = 9.730(4) ?. It is described as a three-dimensional(3D) architecture made up of [P4O12]4- anionic spiral chains and HoO8 polyhedra by corner-sharing. The 8-coordinated sodium atoms are located in infinite tunnels. The results of EDX and IR spectrum are in good agreement with the crystallographic analysis. In addition, NaHo(PO3)4 exhibits visible light emission in the solid state at room temperature.