Add time:09/07/2019         Source:sciencedirect.com

The Raman spectrum of atelestite Bi2O(OH)(AsO4), a hydroxy-arsenate mineral containing bismuth, has been studied in terms of spectra-structure relations. The studied spectrum is compared with the Raman spectrum of atelestite downloaded from the RRUFF database. The sharp intense band at 834 cm−1 is assigned to the ν1 AsO43− (A1) symmetric stretching mode and the three bands at 767, 782 and 802 cm−1 to the ν3 AsO43− antisymmetric stretching modes. The bands at 310, 324, 353, 370, 395, 450, 480 and 623 cm−1 are assigned to the corresponding ν4 and ν2 bending modes and BiOBi (vibration of bridging oxygen) and BiO (vibration of non-bridging oxygen) stretching vibrations. Lattice modes are observed at 172, 199 and 218 cm−1. A broad low intensity band at 3095 cm−1 is attributed to the hydrogen bonded OH units in the atelestite structure. A weak band at 1082 cm−1 is assigned to δ(BiOH) vibration.

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