Two fluorophosphates exhibit a S = 2 uniform chain structure formed by MnO2F4 octahedra with corner-sharing F atoms along the b-axis.
By incorporating multiple alkali and alkaline-earth metal elements, we have successfully synthesized and report the first tri-alkali/alkaline-earth metal fluorophosphate KBaSr(PO2F2)(PO3F)2 as a promising deep-ultraviolet birefringent crystal.
We report the concept of anisotropic structure building units encompassing diverse chemical bonds (ABUCB), which play a crucial role in optimizing the overall second-order nonlinear optical performance of both DUV/UV and IR NLO materials.
Here, the polar covalent group (PO3NH3)− is identified as a novel deep-ultraviolet (DUV) NLO-active unit. Its ordered arrangement in NaPO3NH3 makes this compound exhibiting the largest birefringence among DUV non-π-conjugated phosphate systems.
The hydrolysis of PF6− is more accelerated by Al3+ than by H+, but the hydrolysis of PO2F2− and PO3F2− is more accelerated by H+ rather than by Al3+.