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用原子力显微镜实时观测了有机晶体CMTD(CdHg(SCN)4(H6C2OS)2)的表面分解过程,这一分解过程是以表面形貌变化来表征的,并且能反映分解过程中的一些固态反应的物理化学变化机制。X射线能谱分析(EDAX)表明,相对于新鲜的CMTD晶体,在分解物中Hg低而S高;X射线衍射(XRD)表明分解物为非晶态;红外吸收光谱(IR)表明在CMTD晶体结构中的(H6C2OS)结构基元被分解为H2O和酸;量热分析(DSC)表明CMTD晶体在室温空气中确实有化学反应发生。本文用原子力显微镜实时记录了这一分解过程的形貌变化,发现这种非晶态的分解物的产生过程为:成核核生长核分散等。这是首次用原子力显微镜实时观测到这种分解过程。
The surface decomposition of organic crystal CMTD (CdHg (SCN) 4 (H6C2OS) 2) was observed by atomic force microscopy in real time. The decomposition process was characterized by the change of surface topography and could reflect some solid state reactions during the decomposition Physical chemistry change mechanism. EDAX showed that Hg was low and S high in the decomposition products relative to fresh CMTD crystals; X-ray diffraction (XRD) showed that the decomposition products were amorphous; IR absorption spectra showed that in CMTD The (H6C2OS) structural motif in the crystal structure is decomposed into H2O and acid. The calorimetric analysis (DSC) shows that there is indeed a chemical reaction of CMTD crystals in air at room temperature. In this paper, atomic force microscope real-time recording of the morphological changes of the decomposition process found that the formation of this amorphous decomposition process: nuclear nucleation and nuclear dispersion. This is the first time that atomic force microscopy has observed this decomposition.