A non-centered mixed anion crystal material and its preparation method and application
An anion and crystal technology, applied in the field of inorganic nonlinear optical materials, can solve the problems of low laser damage threshold two-photon absorption, high, medium and far infrared transmittance, etc. Frequency response, effect of moderately sized birefringence
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Embodiment 1
[0035] Strontium oxide, germanium, selenium and cesium iodide are fully ground according to the molar ratio of SrO:Ge:Se:CsI=1:1:2:6, mixed evenly and placed in a quartz crucible. Place the quartz crucible with the raw material in the quartz reaction tube, and vacuum it 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 750°C, keep it warm for 100 hours, then cool it down to 300°C at a rate of no more than 3°C / hour, stop heating, and naturally After cooling to room temperature, the product was washed with deionized water and dried with ethanol, and the obtained colorless rod-shaped crystals were the non-centralized anion crystal material SrGeOSe 2 .
Embodiment 2
[0037] Strontium oxide, germanium, selenium, and potassium bromide are fully ground and mixed in a quartz crucible according to the molar ratio of SrO:Ge:Se:KBr=1:1:2:12. Place the quartz crucible with the raw material in the quartz reaction tube, and vacuum it 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 warm for 100 hours, and then cool it down to 300°C at a rate of no more than 3°C / hour, then stop heating. After cooling to room temperature, the product was washed with deionized water and dried with ethanol, and the obtained colorless rod-shaped crystals were the non-centralized anion crystal material SrGeOSe 2 .
[0038] The non-centralized anion crystal materials obtained in Examples 1 and 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 in Example 1 was carried out on a Mercury 70 single crystal diffractometer, with a Mo target, a Kα radiation source (λ=0.07107nm), and a test temperature of 293K. And analyze its structure through Shelx-2014. The crystallographic data results of the sample 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 The crystallographic data of
[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 As the basic asymmetric structural unit, the tetrahedron is connected to each other through the common vertex 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 in...
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