Infrared and Raman spectroscopic characterization of the silicate mineral olmiite CaMn^2+[SiO3(OH)](OH) – implications for the molecular structure
| Autor: | Frost, Ray, L., Scholz, Ricardo, López, Andrés, Xi, Yunfei, Granja, Amanda, Žigovečki Gobac, Željka, Fernandes, Lima, Rosa, Malena |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Thermogravimetric analysis
Olmiite Infrared Scanning electron microscope olmiite phosphate Raman spectroscopy infrared spectroscopy Organic Chemistry Analytical chemistry Infrared spectroscopy chemistry.chemical_element Phosphate Manganese Silicate Analytical Chemistry Inorganic Chemistry chemistry.chemical_compound symbols.namesake chemistry symbols Molecule Spectroscopy |
| Zdroj: | Repositório Institucional da UFOP Universidade Federal de Ouro Preto (UFOP) instacron:UFOP |
| Popis: | We have studied the mineral olmiite CaMn[SiO 3 (OH)](OH) which forms a series with its calcium analogue poldervaartite CaCa[SiO 3 (OH)](OH) using a range of techniques including scanning electron microscopy, thermogravimetric analysis, Raman and infrared spectroscopy. Chemical analysis shows the mineral is pure and contains only calcium and manganese in the formula. Thermogravimetric analysis proves the mineral decomposes at 502 °C with a mass loss of 8.8% compared with the theoretical mass loss of 8.737%. A strong Raman band at 853 cm −1 is assigned to the SiO stretching vibration of the SiO 3 (OH) units. Two Raman bands at 914 and 953 cm −1 are attributed to the antisymmetric vibrations. Two intense Raman bands observed at 3511 and 3550 cm −1 are assigned to the OH stretching vibration of the SiO 3 (OH) units. The observation of multiple OH bands supports the concept of the non-equivalence of the OH units. Vibrational spectroscopy enables a detailed assessment of the molecular structure of olmiite. |
| Databáze: | OpenAIRE |
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