Infrared and Raman Spectroscopic Characterization of the Phosphate Mineral Leucophosphite K(Fe 3+ ) 2 (PO 4 ) 2 (OH) · 2(H 2 O)

Author： Frost Ray L.

Publisher： Taylor & Francis Ltd

ISSN： 0038-7010

Source： Spectroscopy Letters, Vol.46, Iss.6, 2013-08, pp. : 415-420

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Abstract

The phosphate mineral leucophosphite K(Fe₂)³⁺(PO₄)₂(OH) · 2H₂O has been characterized by SEM-EDS, Raman, and infrared spectroscopic measurements. The mineral is predominantly a K and Fe phosphate with some minor substitution of Al in the Fe³⁺ site. Raman bands at 994 and 1058 cm⁻¹ are assigned to the symmetric stretching modes of and units. The Raman bands at 1104, 1135, and 1177 cm⁻¹ are assigned to the and antisymmetric stretching modes. Raman and infrared spectra in the 2600–3800 cm⁻¹ region show a complex set of overlapping bands, which may be resolved into the component bands. The Raman bands observed at 3325, 3355, and 3456 cm⁻¹ are attributed to water stretching vibrations, and in the infrared spectrum, bands at 3237, 3317, and 3453 cm⁻¹ are assigned to water stretching bands.