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  Scopus ID: 21100926589

Synthesis and Structural Study of a Novel Mixed Phosphate: Cd0.5Zn2.5(PO4)2.4H2O

Khalil Ahraifou, Jamal Khmiyas, Mohammed Hadouchi, Abderrazzak Assani, Mohamed Saadi and Lahcen El Ammari

Abstract

Single crystals of the new phosphate Cd0.5Zn2.5(PO4)2.4H2O were successfully grown hydrothermally and structurally determined by single crystal X-ray diffraction data. This new phase is isotypic with the Hopeite and crystallizes in the orthorhombic space group Pnma with the cell parameters a = 10.6592(9) Å, b = 18.408(2) Å and c = 5.0565(4) Å. This crystal structure contains seven independent fully occupied cationic sites. The first six, that is located in 4c(.m.) Wycokoff positions, accommodate Cd(1)/Zn(1), four sites are filled by Zn(2) and three hydrogen, while the remaining site is entirely occupied by one P atom. This crystal structure can be described in terms of a net framework built up from a slightly distorted (Cd(1)/Zn(1))O2(OH2)4 octahedra and regular Zn(2)O4/PO4 tetrahedra units. In the structure, two Zn2(2)O7 dimers are held together by means of PO4 groups in such way to form zigzag chains of corner-sharing. Adjacent chains are connected with the apical corners resulting in a complex layer of three- and four-membered sequential rings extending along [001]. The stacked layers are bridged by (Cd(1)/Zn(1))O2(OH2)4 octahedra that stabilizes the structure.

Published on: September 29, 2023
doi: 10.17756/nwj.2023-s2-062
Citation: Ahraifou K, Khmiyas J, Hadouchi M, Assani A, Saadi M, et al. 2023. Synthesis and Structural Study of a Novel Mixed Phosphate: Cd0.5Zn2.5(PO4)2.4H2O. NanoWorld J 9(S2): S367-S371.

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