Synthesis, crystal structure and spectroscopic characterization of a new cadmium phosphate, Na2Cd5(PO4)4

Synthesis, crystal structure and magnetic behavior of a new calcium magnesium and iron orthophosphate Ca2MgFe2(PO4)4

“…Accordingly, it has been found that the members of the M3M'3(PO4)4 phosphates group, M3Cu3(PO4)4 (M = Ca, Sr and Pb) and Ca3Mg3(PO4)4, crystallize in the monoclinic system with different space groups [16][17][18][19]. However, the tetraorthophosphate A2(M/M')5(PO4)4, namely Na2Cd5(PO4)4 [20], Na2Ca5(PO4)4 [21], Na2Mg5(PO4)4 [22], Na2Zn5(PO4)4 [23], Li2Cu5(PO4)4 [24] and Cs2Zn5(PO4)4 [25], known till now, represent a structurally rich group since those phosphates adopt different crystal structure in triclinic, monoclinic, quadratic or hexagonal systems. Moreover, a great deal of interest has been accorded to the third tetra-orthophosphate group, K3Cr3(PO4)4 [26], Na3Fe3(PO4)4 [27] and Na3V3(PO4)4 [28], which crystallize in the orthorhombic and monoclinic system respectively, owing to its interesting properties in the electrochemistry applications as positive electrodes for sodium batteries [27,28].…”

A deep ultraviolet transparent birefringent monofluorophosphate: Cd2.5(NH4)2(PO3F)3Cl ⋅ 2H2O

“…Upon excitation, CNPFC displays a emission of purple fluorescence with λ em =410 nm. The luminescence is also observed in some other cadmium‐containing compounds, such as Na 2 Cd 5 (PO 4 ) 4 ( λ em =610 nm, E g =N/A), [31] CdO ( λ em =487 nm, E g =2.50 eV), [32,33] CdSe ( λ em =560 nm, E g =1.73 eV) [34] and ACd 4 Ga 5 S 12 (A=K, Rb, Cs) ( λ em =584–595 nm, E g =2.98–3.09 eV), [35] of which the luminescence mechanism was mainly explained by either the electron transition of Cd 2+[31] or the lattice defects [33,36] . We consider the fluorescence of CNPFC can be attributed to the 4 d 10 →4 d 9 5 s 1 electron transition of Cd 2+ , and the blue shift of λ em in CNPFC may be due to its large band gap (>6.21 eV) [32,33] …”