Characterisation of Ni silicate-bearing minerals by UV-Vis-NIR spectroscopy : Effect of Ni substitution in hydrous Ni-Mg silicates
Reddy, B. Jagannadha, Frost, Ray L., & Dickfos, Marilla J. (2009) Characterisation of Ni silicate-bearing minerals by UV-Vis-NIR spectroscopy : Effect of Ni substitution in hydrous Ni-Mg silicates. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 71(5), pp. 1762-1768.
Three Ni silicate-bearing pimelite, nepouite and pecoraite minerals, from Australia have been investigated by UV-Vis-NIR spectroscopy to study the effect of Ni-Mg substitution. The observation of three major absorption bands at 9205-9095 cm-1, 15600-15190 cm-1 and 26550-25660 cm-1 are the characteristic features of Ni2+ in six fold coordination. The effect of cation substitution like Mg2+ for Ni2+ on band shifts in electronic and vibrational spectra enable the distinction between the Ni-bearing silicates.
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