Vibrational spectroscopic characterization of the arsenate mineral barahonaite: Implications for the molecular structure

López, Andrés, Frost, Ray L., Xi, Yunfei, & Scholz, Ricardo (2014) Vibrational spectroscopic characterization of the arsenate mineral barahonaite: Implications for the molecular structure. Spectroscopy Letters, 47(7), pp. 571-578.

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The mineral barahonaite is in all probability a member of the smolianinovite group. The mineral is an arsenate mineral formed as a secondary mineral in the oxidized zone of sulphide deposits. We have studied the barahonaite mineral using a combination of Raman and infrared spectroscopy. The mineral is characterized by a series of Raman bands at 863 cm−1 with low wavenumber shoulders at 802 and 828 cm−1. These bands are assigned to the arsenate and hydrogen arsenate stretching vibrations. The infrared spectrum shows a broad spectral profile. Two Raman bands at 506 and 529 cm−1 are assigned to the triply degenerate arsenate bending vibration (F 2, ν4), and the Raman bands at 325, 360, and 399 cm−1 are attributed to the arsenate ν2 bending vibration. Raman and infrared bands in the 2500–3800 cm−1 spectral range are assigned to water and hydroxyl stretching vibrations. The application of Raman spectroscopy to study the structure of barahonaite is better than infrared spectroscopy, probably because of the much higher spatial resolution.

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ID Code: 83618
Item Type: Journal Article
Refereed: Yes
Keywords: arsenate, barahonaite, infrared, phosphate, reman, smolianinovite group
DOI: 10.1080/00387010.2013.825274
ISSN: 1532-2289
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Taylor & Francis
Deposited On: 16 Apr 2015 01:52
Last Modified: 16 Apr 2015 01:52

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