Assessment of the molecular structure of the borate mineral boracite Mg3B7O13Cl using vibrational spectroscopy.
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2012
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Boracite is a magnesium borate mineral with formula: Mg3B7O13Cl and occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic – pyramidal crystal system. An intense Raman band at 1009 cm_1 was assigned to the BO stretching vibration of the B7O13 units. Raman bands at 1121, 1136, 1143 cm_1 are attributed to the in-plane bending vibrations of trigonal boron. Four sharp Raman bands observed at 415, 494, 621 and 671 cm_1 are simply defined as trigonal and tetrahedral borate bending modes. The Raman spectrum clearly shows intense Raman bands at 3405 and 3494 cm_1, thus indicating that some Cl anions have been replaced with OH units. The molecular structure of a natural boracite has been assessed by using vibrational spectroscopy.
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Raman spectroscopy, Borate, Boracite, Infrared, Evaporite
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FROST, R. L.; XI, Y.; CIPRIANO, R. A. S. Assessment of the molecular structure of the borate mineral boracite Mg3B7O13Cl using vibrational spectroscopy. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 96, p. 946-951, 2012. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142512007366>. Acesso em: 07 out. 2014.