Naslov
Infrared and Raman spectroscopic characterization of the silicate mineral olmiite CaMn2+[SiO3(OH)](OH)- implications for the molecular structure

Autori
Frost, Ray, L. ; Scholz, Ricardo ; López, Andrés ; Xi, Yunfei ; Granja, Amanda ; Žigovečki Gobac, Željka ; Fernandes, Lima ; Rosa, Malena

Izvornik
Journal of molecular structure (0022-2860) 1053 (2013); 22-26

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
olmiite; phosphate; Raman spectroscopy; infrared spectroscopy

Sažetak
We have studied the mineral olmiite CaMn[SiO3(OH)](OH) which forms a series with its calcium analogue poldevaartite CaCa[SiO3(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 SiO3(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 SiO3(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.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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