Abstract
A new mixed-anion diphosphate, Li1.52Na4.48Cd8(PO4)2(P2O7)4, was synthesized by standard high-temperature solid state technique for the first time. It crystallizes in triclinic space group P-1, with unit cell parameters a=6.7330(3) Å, b=9.5603 (4) Å, c=11.3838 (5) Å, α=98.5630(10) °, β=92.3460(10) °, γ=90.4500(10) °. The crystal structure contains four types of dimensions, that is zero-dimensional (0D) Cd4O16 groups, one-dimensional (1D) [M2P5O20]∞ (M=Li/Na, Na) chains, two-dimensional (2D) Na/CdO6 layers and the complex three-dimensional (3D) framework. After careful structural analysis, it is found that the number of cations has an effect on the degree of polymerization of the [PO4] groups. Thermal behaviors indicate that the title compound melts congruently and infrared (IR) spectrum shows the existences of PO4 and P2O7 groups. The ultraviolet-visible light-near infrared (UV/Vis/NIR) diffuse reflectance spectra are also performed on this compound.
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