Synthesis and purification of novel infrared nonlinear BaGa4Se7 polycrystalline
BaGa4Se7(BGSe)is currently attracting considerable attention as a new type of infrared nonlinear crystal.We explored the synthesis of BGSe polycrystalline raw materials using both the two-temperature zone method and the high-pressure-assisted method,and designed a rapid purification method with a large temperature gradient to purify the synthesized polycrystalline material firstly.And then,the phase composition and impurity concentration of BGSe polycrystals before and after purification were characterized using powder X-ray diffraction(XRD),inductively coupled plasma mass spectrometry(ICP-MS)and energy-dispersive X-ray spectroscopy(EDS).The X-ray diffraction spectra are consistent with theoretical simulation results,showing no impurity peaks.ICP-MS test results also show a significant reduction in the content of metal impurities such as Fe,Al,and O impurity in the ingot after purification.The research can provide a raw material basis for the growth of high-quality single crystal.
materialpolycrystalline synthesistwo-temperature zone methodhigh-pressure-assisted methodlarge temperature gradient purificationinfrared nonlinear crystal
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