Non-heart mixed anionic crystal material as well as preparation method and application thereof
An anion and crystal technology, applied in the field of inorganic nonlinear optical materials, can solve the problems of high, medium and far infrared transmittance, low laser damage threshold two-photon absorption, etc., achieve strong frequency doubling response, realize large frequency doubling coefficient and high laser Effect of damage threshold, good second-order infrared nonlinear optical properties
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Embodiment 1
[0035] The strontium oxide, germanium, selenium, and cesium iodide are fully ground according to the molar example as SrO:Ge:Se:CsI=1:1:2:6, and the mixture is uniformly placed in a quartz crucible. Place the quartz crucible containing the raw materials in the quartz reaction tube and evacuate to 10 -3 Pa, and use a hydrogen-oxygen flame to fuse and seal the quartz reaction tube. Put the sealed quartz reaction tube into a tube furnace with a temperature controller, heat it to 750°C, keep it for 100 hours and then cool it down to 300°C at a rate of no more than 3°C / hour, stop heating, naturally After cooling to room temperature, the product was washed with deionized water and dried with ethanol. The colorless rod-shaped crystal obtained was the non-center mixed anion crystal material SrGeOSe 2 .
Embodiment 2
[0037] The strontium oxide, germanium, selenium, and potassium bromide are thoroughly ground and mixed according to the molar ratio of SrO:Ge:Se:KBr=1:1:2:12 and placed in a quartz crucible. Place the quartz crucible containing the raw materials in the quartz reaction tube and evacuate to 10 -3 Pa, and use a hydrogen-oxygen flame to melt and seal the quartz reaction tube. Put the sealed quartz reaction tube into a tube furnace with a temperature controller, heat it to 850°C, keep it for 100 hours, and then cool it down to 300°C at a rate of no more than 3°C / hour, stop heating, naturally After cooling to room temperature, the product was washed with deionized water and dried with ethanol. The colorless rod-shaped crystal obtained was the non-center mixed anion crystal material SrGeOSe 2 .
[0038] The non-centered mixed anion ion crystal materials obtained in Example 1 and Example 2 are infrared nonlinear optical crystal materials.
Embodiment 3
[0040] (1) Structural characterization of samples
[0041] The X-ray single crystal diffraction of the sample of Example 1 was performed on a Mercury 70 single crystal diffractometer, Mo target, Kα radiation source (λ=0.07107nm), and the test temperature was 293K. The structure was analyzed through Shelx-2014. The crystallographic data results of the samples are shown in Table 1, and the schematic diagram of the crystal structure is shown in figure 1 Shown.
[0042] Table 1 Sample SrGeOSe 2 Crystallographic data
[0043]
[0044] From figure 1 As can be seen. The structure of the obtained crystal is mainly composed of GeO in hybrid coordination mode 2 Se 2 Tetrahedrons, as basic asymmetric structural units, are connected to each other by sharing vertices O to form a one-dimensional chain structure, and the alkaline earth metal Sr is dispersed and filled in the structure.
[0045] The X-ray powder diffraction phase analysis (XRD) of the sample of Example 1 was carried out on the Mini...
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