کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1238320 | 1495286 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A vibrational spectroscopic study of perhamite, an unusual silico-phosphate
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The silico-phosphate mineral perhamite has been studied using a combination of electron and vibrational spectroscopy. SEM photomicrographs reveal that perhamite morphology consists of very thin intergrown platelets that can form a variety of habits. Infrared spectroscopy in the hydroxyl-stretching region shows a number of overlapping bands which are observed in the range 3581-3078Â cmâ1. These wavenumbers enable an estimation to be made of the hydrogen bond distances in perhamite: 3.176(0), 2.880(5), 2.779(6), 2.749(3), 2.668(1) and 2.599(7)Â Ã
. Intense Raman bands are observed in the region 1110-1130 and 966-996 cmâ1 and are assigned to the SiO4 and PO4 symmetric stretching modes. Other bands are observed in the range 1005-1096 cmâ1 and are attributed to the ν3 antisymmetric bending modes of PO4. Some low intensity bands around 874 cmâ1 were discovered and remain unclassified. Bands in the low-wavenumber region are assigned to the ν4 and ν2 out-of-plane bending modes of the OSiO and PO4 units. Raman spectroscopy is a useful tool in determining the vibrational spectroscopy of mixed hydrated multi-anion minerals such as perhamite. Information on such a mineral would be difficult to obtain by other means.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 67, Issues 3â4, July 2007, Pages 604-610
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 67, Issues 3â4, July 2007, Pages 604-610
نویسندگان
Ray L. Frost, Matt L. Weier, Stuart J. Mills,