کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7810234 | 1501763 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vibrational spectroscopic characterization of the phosphate mineral barbosalite Fe2+Fe23+(PO4)2(OH)2 - Implications for the molecular structure
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
Natural single-crystal specimens of barbosalite from Brazil, with general formula Fe2+Fe23+(PO4)2(OH)2 were investigated by Raman and infrared spectroscopy. The mineral occurs as secondary products in granitic pegmatites. The Raman spectrum of barbosalite is characterized by bands at 1020, 1033 and 1044 cmâ1 cmâ1, assigned to ν1 symmetric stretching mode of the HOPO33- and PO43- units. Raman bands at around 1067, 1083 and 1138 cmâ1 are attributed to both the HOP and PO antisymmetric stretching vibrations. The set of Raman bands observed at 575, 589 and 606 cmâ1 are assigned to the ν4 out of plane bending modes of the PO4 and H2PO4 units. Raman bands at 439, 461, 475 and 503 cmâ1 are attributed to the ν2 PO4 and H2PO4 bending modes. Strong Raman bands observed at 312, 346 cmâ1 with shoulder bands at 361, 381 and 398 cmâ1 are assigned to FeO stretching vibrations. No bands which are attributable to water vibrations were found. Vibrational spectroscopy enables aspects of the molecular structure of barbosalite to be assessed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1051, 5 November 2013, Pages 292-298
Journal: Journal of Molecular Structure - Volume 1051, 5 November 2013, Pages 292-298
نویسندگان
Ray L. Frost, Yunfei Xi, Andrés López, Ricardo Scholz, Cristiano de Carvalho Lana, Bárbara Firmino e Souza,