کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1249648 | 970708 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressure-induced phase transitions in stearic acid C form
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Pressure-dependent Raman scattering studies have been performed on stearic acid single crystal, C form. The vibrational spectra have been recorded in the 20–1200 cm−1 and in the 2800–3100 cm−1 spectral regions. The behavior of the Raman modes indicates that the crystal undergoes a series of structural modifications. The change observed between 0.8 and 1.27 GPa was associated with a conformational modification or tilting of the dimer. A second modification was observed at ∼2.5 GPa accompanied by jump of lattice mode frequencies, and the appearance and disappearance of bands. Finally, a third set of changes in the Raman band profile was observed between 3.3 and 3.8 GPa and was associated with another structural phase transition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 54, Issue 2, 18 November 2010, Pages 118–122
Journal: Vibrational Spectroscopy - Volume 54, Issue 2, 18 November 2010, Pages 118–122
نویسندگان
F.F. de Sousa, P.T.C. Freire, G.D. Saraiva, J.A. Lima Jr., P. Alcantara Jr., F.E.A. Melo, J. Mendes Filho,