Combining multiple anions to design compounds with novel structures and excellent optical properties has become a hot research field. In this paper, a novel nitrate oxyfluoride, Hg3O2(NO3)F, has been obtained....
Compounds constructed by mixed anions are widely favorable
for
their diverse crystal structures and physical performances. Here,
two lead phosphite halides, Pb2Cl2(HPO3)(H2O) (1) and Pb3Br2(HPO3)2 (2), were obtained by
facile hydrothermal reactions. Both compounds crystallize in the space
group Pnma. 1 exhibits a 3D structure
composed of HPO3 units, PbCl4O3 pentagonal
bipyramids, and PbO3 pyramids. 2 also shows
a 3D framework built by HPO3 units, PbO2Br4 octahedron, PbO5 and PbO3Br2 square pyramids. By introducing halogen anions to the lead phosphite
system, 1 and 2 show enhanced birefringences
of 0.083 and 0.072 at 1064 nm, respectively, compared with 0.023@1064
nm for Pb2(HPO3)2. In this work,
syntheses, crystal structures, optical properties, and theoretical
calculation results have been studied in detail.
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