ステアリン酸B型Orth II/Mon Overgrowth結晶についての顕微ラマンスペクトル

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There are two basic polytypes due to the defference in the stacking modes in stearic acid B form, i. e. the single-layered monoclinic (Mon) and the double-layered orthorhombic (OrthII) polytypes. In order to facilitate the microcharacterization of polytype stuctures, polarized micro-Raman spectra of Orth II/Mon overgrowth crystals have been investigated in the low-frequency region below about 30cm-1. It was observed some growth spiral steps of OrthII on onesided surface of the overgrowth crystals after 9 hours at 23℃ in the saturated n-hexane solution. Polarized micro-Raman spectra of all observation points on the step surface of the overgrowth crystals at 23℃ and 25℃ indicated the characteristic bands belonging to Orth II polytype, the bands at 21.0cm-1and 6.9cm-1in the c(a, b) c polarization. The depth profile of the overgrown crystal were obtained by shifting the focal point of the laser beam along the direction normal to the overgrown step surface into the interior by micro-Raman spectra. It was clarified the overgrown steps produced on the surface of a Mon seed single crystal in the temperature range 32～23℃ were found to be of the only OrthII polytype. In order to obtain the structural information about the boundary of the overgrown crystal, the relative intensities of Raman bands belonged to OrthII and Mon were compared with variation of the magnification of the objective lens and with variation of the F value of the diaphragm. It become to clear the presence of the boundary between overgrown OrthII and the surface of Mon seed in the overgrowth crystals.
長崎大学教育学部の論文
1990-05-31

ステアリン酸B型Orth II/Mon Overgrowth結晶についての顕微ラマンスペクトル

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