Nonlinear optical crystal niobium oxyiodate sulfate and its preparation method and use
A nonlinear optics, crystal technology, applied in nonlinear optics, chemical instruments and methods, optics, etc., to achieve the effects of high optical transmittance, high crystal purity, and simple synthesis method
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Embodiment 1
[0037] Place 0.2mmol of niobium pentoxide, 4mmol of iodic acid, 1mL of water and 2mL of 98wt% sulfuric acid in a 23mL PTFE-lined stainless steel hydrothermal reaction kettle, and then put the hydrothermal reaction kettle into the muffle furnace , the temperature was raised to 180°C in 3 hours, the temperature was kept constant for 72 hours, and then the temperature was lowered to room temperature at a cooling rate of 4°C / h; after the reaction, the product was washed several times with deionized water and filtered to obtain pure Nb 2 o 3 (IO 3 ) 2 (SO 4 ) crystals.
Embodiment 2
[0039] The niobium powder of 0.4mmol, the iodic acid of 4mmol, 1.2mL water and 2mL98wt% sulfuric acid are placed in the stainless steel hydrothermal reaction kettle of the Teflon liner of 23mL, then the hydrothermal reaction kettle is put into the muffle furnace, The temperature was raised to 240°C in 3 hours, kept at a constant temperature for 24 hours, and then lowered to room temperature at a cooling rate of 4°C / h; after the reaction was completed, the product was washed several times with deionized water and filtered to obtain pure Nb 2 o 3 (IO 3 ) 2 (SO 4 ) crystals.
Embodiment 3
[0041] Place 0.2mmol of niobium pentoxide, 2mmol of iodine pentoxide, 1mL of water and 2mL of 98wt% sulfuric acid in a 23mL stainless steel hydrothermal reaction kettle lined with polytetrafluoroethylene, and then put the hydrothermal reaction kettle into the muffle In the furnace, the temperature was raised to 220°C in 3 hours, and the temperature was kept at a constant temperature for 24 hours, and then the temperature was lowered to room temperature at a cooling rate of 4°C / h; after the reaction was completed, the product was washed several times with deionized water and filtered to obtain pure Nb 2 o 3 (IO 3 ) 2 (SO 4 ) crystals.
[0042] Above-mentioned embodiment 1-3 all prepares pure Nb2 o 3 (IO 3 ) 2 (SO 4 ) crystal, with the inorganic crystal Nb of embodiment 3 gained 2 o 3 (IO 3 ) 2 (SO 4 ) as an example, it is determined by single crystal X-ray diffraction structure analysis, such as figure 2 As shown, the upper XRD spectrum is the experimental test res...
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