Abstract
Phosphate crystals are valuable materials according to their diverse structures and physical and chemistry properties. A zinc orthophosphate, (NH4)3(H3O)Zn4(PO4)4, has been obtained via hydrothermal route. It was crystallized in hexagonal space group P63, featuring a three-dimensional (3D) [Zn(PO4)]– anion network built by corner-sharing connected ZnO4 and PO4 tetrahedra. The NH4+ and H3O+ units are located in the six-member cavities of the framework as the balanced cations. (NH4)3(H3O)Zn4(PO4)4 exhibits a moderate and phase matchable second harmonic generation effect (SHG) about 1.4 times of KH2PO4 (KDP), which is the strongest in zinc orthophosphates. Besides structural features, optical properties measurements and theoretical analyses of (NH4)3(H3O)Zn4(PO4)4 were performed.
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