首页|(163066)K_6Bi_(13)(PO_4)_(15), K_5Bi(P_2O_7)_2, A_5Bi_5(PO_4)_4(P_2O_7)_2 (A=K, Rb): New bismuth phosphates with different condensed phosphate groups
(163066)K_6Bi_(13)(PO_4)_(15), K_5Bi(P_2O_7)_2, A_5Bi_5(PO_4)_4(P_2O_7)_2 (A=K, Rb): New bismuth phosphates with different condensed phosphate groups
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NSTL
Elsevier
Four new Bi(III) phosphates, K_6Bi_(13)(PO_4)_(15), K_5Bi(P_2O_7)_2, and A_5Bi_5(PO_4)_4(P_2O_7)_2 (A= K, Rb) with the different condensed P-0 groups have been successfully synthesized via the solid-state reactions. The single crystals X-ray diffractions show that they crystallize in the different space groups (K_6Bi_(13)(PO_4)_(15): C2; K_5Bi(P_2O_7)_2: P1; K_5Bi_5(PO_4)_4(P_2O_7)_2 and Rb_5Bi_5(PO_4)_4(P_2O_7)_2: P2_1/c). The structure of K_6Bi_(13)(PO_4)_(15) can be described as a three-dimensional (3D) network composed of the Bi-0 polyhedra and PO_4 tetrahedra with K atoms filling in the space to balance the residual charges. K_5Bi(P_2O_7)_2 features 2D [BiP_4O_(14)]_∞, layers built by the BiO_6 oc-tahedra and P_2O_7 dimers and the adjacent [BiP_4O_(14)]_∞ layers are bridged by the K atoms. A_5Bi_5(PO_4)_4(P_2O_7)_2 (A = K, Rb) contain two different condensed P-0 groups, PO_4 tetrahedra and P_2O_7 dimers, which are connected by Bi-0 polyhedra to construct the complicated 3D framework with K/Rb atoms located in the tunnels. Note that, the compounds that simultaneously contain two different types of P-0 groups are still rare in phosphates. Detailed structural comparisons of Bi~(3+)-containing phosphates indicate that the Bi/P ratios have a significant effect on the condensed degrees of PO_4 groups. Furthermore, TG-DSC, IR, UV-Vis-NIR diffuse reflectance spectra and SHG test for title compounds have also been reported.
Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, College of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
NSTL
Elsevier
