非线性光学晶体MnHg（SCN）4（C2H6SO）2的热学和光学性质的测定

非线性光学晶体MnHg（SCN）₄（C₂H₆SO）₂的热学和光学性质的测定

摘要: 制备了一种新型非线性光学晶体:二甲亚砜合硫氰酸汞锰(分子式:MnHg（SCN）₄（C₂H₆SO）₂,简称MMTD)。用热重法、差热分析法、差示扫描量热法、热机械分析法、分光光度法和红外光谱研究了它的热学和光学性质。MMTD晶体具有较好的物理化学稳定性。在27℃时,它的比热为699.5 J/mol·℃。晶体的热膨胀系数为α₁=5.33×10^-5/℃,α₂=4.51×10^-5/℃,α₃=3.10×10^-5/℃。MMTD晶体的截止波长为375nm;透光波段为375-2560 nm。MMTD晶体在标准紫光波长404nm的透过率为44.18％,高于硫氰酸汞锰（MMTC）晶体。

Abstract: A novel nonlinear optical crystal: manganese mercury thiocyanate-bis（dimethyl sulfoxide） MnHg（SCN）₄（C₂H₆SO_）2 （MMTD）was prepared. Its thermal and optical properties were studied by using thermogravimetry, differential thermal analysis, differential scanning calorimetry, thermomechanical analysis, transmission and infrared spectroscopy. The crystal possesses good physico- chemical stability. The specific heat of the crystal is 699.5 J/mol·℃ at 27℃. The thermal expansion coefficient along the a-, b-and c-axis is α₁ =5.33 x 10^-5/℃, α₂=4.51 x 10^-5/℃, α₃ = 3.10 x 10^-5/℃. Its UV transparency cutoff is 375 nm, and the transmission region is 375- 2560 nm. The optical transmission is 44.18% at 404 nm, which is higher than that of MnHg（SCN）₄ （MMTC）.