Effect of cations of Xinjiang Institute of Physics and Chemistry on structure and properties of alkali metal halogen borate crystals
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Figure 1. Three-dimensional network structure of K3-xNaxB6O10Br (x=0.13, 1.3) crystals
Figure 2. Frequency Multiplier and Phase Matching Curve
Synthesizing new UV nonlinear optical crystal materials is a demand for the development of modern laser technology. Currently, cation-based replacement is one of the important and effective methods for obtaining new nonlinear optical materials. Alkali metal and halogen ions help to broaden the transmission range of borate in the ultraviolet region. Therefore, the research on the effect of cations on the structure and properties of alkali metal haloborates has attracted international attention.
The research group of photoelectric functional materials of the Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences introduced Na into K3B6O10Br crystals and synthesized four new crystals, K3-xNaxB6O10Br (x=0.13, 0.67, 1.30, 2.20). The structural properties test showed that the Na content significantly affected the crystal structure, resulting in changes in the crystallized physicochemical properties. Although their structure contains [B6O13] anionic groups, their crystal systems and space groups are not exactly the same. Among them, K3-xNaxB6O10Br (x=0.13, 0.67) belongs to the non-centrosymmetric R3m space group, and K3-xNaxB6O10Br (x=1.30, 2.20) belongs to the center-symmetric Pnma space group (Figure 1). K3-xNaxB6O10Br (x=0.13, 0.67) has a doubling effect of 2.8-fold KDP (Figure 2).
This work studied the mechanism of the influence of cations on the crystal structure and properties, revealed the relationship between crystal composition, structure and properties, clarified the laws governing the properties of cation-modulated crystals, and provided ideas for exploring new ultraviolet non-linear optical crystal materials.
The research results were published in the international journal Cryst. Growth Des. The relevant research work was funded by the National Natural Science Foundation of China and high-level talents in Xinjiang Uygur Autonomous Region.
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