氟硼铍酸钾KBe2 BO3 F2(KBBF)晶体是至今发现可相位匹配的倍频波长最短的晶体之一。采用 TG-DSC热分析技术研究了KBBF的热分解动力学特性，发现其分解为单向非可逆的过程。利用 Doyle 法和 Kissinger法求得了KBBF热分解反应的活化能E和指前因子A分别为440.988 kJ/mol 和1.414×1019 s-1。通过 Coats-Red-fern方程的线性回归处理并结合 Malek法和反应前后的扫描电镜图建立了 KBBF 的热分解动力学方程，研究发现KBBF的热分解动力学过程符合R3机理，即球形对称的三维相界面反应模型。
KBe2 BO3 F2 (KBBF)is currently one of the practical ultraviolet nonlinear optical (NLO)crystals with shortest wave-length which can be phase-matched.The thermal decomposition characteristics of KBBF were studied by TG-DSC thermal analysis,the result showed that the process was an irreversible one-way reaction.The ac-tivation energy E and pre-exponential factor A were calculated by Doyle and Kissinger methods,and the values were 440.988 kJ/mol and 1.414 × 1019 s-1 respectively.According to the results of linear regressions of Coats-Redfern equation,combined with Malek method and SEM images before and after reaction,the differential equation was de-duced.The study showed that the thermal decomposition process of KBBF belonged to spherical symmetric three-di-mensional phase interface reaction (R3 ).
参考文献
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