Cs₂Zn₅(PO₄)₄ and Cs₃La(PO₄)₂: Two Cs‐Containing Phosphates with Three‐Dimensional Frameworks

Abstract

Two phosphates, Cs2Zn5(PO4)4 and Cs3La(PO4)2 have been successfully synthesized by employing the conventional solid‐state reaction method, and their structures were determined by single‐crystal X‐ray diffraction. Cs2Zn5(PO4)4 owns a three‐dimensional ∞3[Zn4P4O16] framework and Cs3La(PO4)2 features ∞2[La3P6O29] layers spreading in the bc plane. Infrared spectroscopy, UV/Vis‐NIR diffuse reflectance spectroscopy were performed. The thermal properties and electronic structures of two compounds were investigated. In addition, the Ce3+ doped Cs3La(PO4)2 phosphor was synthesized and its photoluminescence was analyzed. The results indicate that the Cs2Zn5(PO4)4:0.01Ce3+ phosphor can be excited by ultraviolet light to obtain blue luminescence.

Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7]: from 2D layered polar to 3D centrosymmetric framework structures

“…19,20 Although, in general, the phosphorus atoms are only fourfold coordinated with oxygen atoms to form the PO 4 tetrahedra, the PO 4 tetrahedra can be further interconnected by sharing oxygen atoms to create a diversity of structure units, such as isolated [P n O 3n+1 ] (n+2)− (n ≥ 1) groups, [PO 3 ] ∞ chains, and [P n O 3n ] n− (n ≥ 3) rings. [21][22][23][24] Their rich structural diversity has resulted in the discovery of thousands of inorganic phosphates. [25][26][27] For example recently it has been noticed that mixed oxo-anionic phosphates with different degrees of phosphate group polymerization can also be synthesized, such as Na 4 Mg 3 ij(PO 4 ) 2 IJP 2 O 7 )], Rb 6 Bi 4 ij(PO 4 ) 2 IJP 2 -O 7 ) 3 ], Na 4 Ni 5 ij(PO 4 ) 2 IJP 2 O 7 ) 2 ], Na 7 Y 2 ij(P 2 O 7 ) 2 IJP 3 O 10 )], KMg 6 ij(P 2 -O 7 ) 2 IJP 3 O 10 )], Pb 2 Cd 3 ij(PO 4 ) 2 IJP 2 O 7 )], and TI 3 Ti 3 Oij(PO 4 ) 3 IJP 2 -O 7 )], [28][29][30][31][32][33][34] which even violate Pauling's fifth rule.…”