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Raman study of natural berlinite from a geological phosphate deposit

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Simona Cinta Pinzaru*, Bogdan P. Onac

Editorial: Vibrational Spectroscopy , 49, p.97-100, 2009.


Natural berlinite from a heated sedimentary sequence in Cioclovina Cave (Romania) was studied using
Raman spectroscopy complemented with infrared techniques. Vibrational data acquired at room temperature were compared with those reported for synthetic berlinite in ambient conditions. The symmetry of the (PO4)3 units is confirmed by the observation of characteristic bands attributed to the n1(PO4)3 stretching mode, both the n4 and n2 bending regions at 500-595 cm1, and 350-500 cm1, respectively. The berlinite Raman fingerprint was unambiguously identified at 1111 and 1104 cm1, confirming the identity of the species and elucidating some controversial reports in the mineralogy field.
The vibrational data of natural berlinite relates to its crystallography, and along with the spectra-structure correlation, confirmed an almost ideal natural berlinite crystal.

Cuvinte cheie: Natural berlinite, Raman, IR, Cioclovina Cave Romania