Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 15, Pages 3147-3153Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm4023369
Keywords
fluoride carbonates; nonlinear optical crystal; deep-UV; crystal growth
Funding
- National Natural Science Foundation of China [91222204, 90922035]
- Chinese Academy of Sciences [KJCX2-EW-H03-03]
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Two nonlinear optical fluoride carbonate crystals (Na8Lu2(CO3)(6)F-2 and Na3Lu(CO3)(2)F-2) have been synthesized under subcritical hydrothermal condition. Both crystals crystallize in the noncentrosymmetric space group Cc (No. 9). The structure of Na8Lu2(CO3)(6)F-2 with high density of [CO3] groups is described as 1D [Na5Lu(CO3)(2)F-2] chains connected by [CO3] triangles, forming an intricate threedimensional framework. Lu3+ and Na+. cations are alternatively ordered and disordered in the cavities of the 3D network. The structure of Na3Lu(CO3)(2)F-2 is built up from the [NaLu(CO3)(2)F-2] layers which are separated by other Na+ cations. The [CO3] anionic groups arrange approximately coparallel to the plane. The second harmonic generation (SHG) measurement indicates that Na8Lu2(CO3)(6)F-2 and Na3Lu(CO3)(2)F-2 have large SHG responses that are approximately 4.29 and 4.21 times KH2PO4 (KDP), respectively. The responses are also phase-matchable in the visible region. In addition, it exhibits wide transparent regions ranging from UV to near IR with a short UV cutoff edge (<200 nm), which suggests that the new compounds are promising as deep-UV NLO materials.
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