title: Characterisation of Ni silicate-bearing minerals by UV-vis-NIR spectroscopy. Effect of Ni substitution in hydrous Ni-Mg silicates.
abstract: 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, 15,600-15,190 and 26,550-25,660 cm(-1) are the characteristic features of Ni(2+) in sixfold coordination. The effect of cation substitution like Mg(2+) for Ni(2+) on band shifts in electronic and vibrational spectra enable the distinction between the Ni-bearing silicates.
authors.affiliation: School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia.
authors.forename: B Jagannadha
authors.initials: BJ
authors.lastname: Reddy
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Marilla J
authors.initials: MJ
authors.lastname: Dickfos
mesh_terms: D008027:Light; D017633:Magnesium Silicates / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry / Q000378:metabolism; D008954:Models, Biological; D008956:Models, Chemical; D009532:Nickel / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology*; D017640:Silicates / Q000737:chemistry* / Q000378:metabolism; D012996:Solutions / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared
chemical_list: D017633:Magnesium Silicates; D008903:Minerals; D017640:Silicates; D012996:Solutions; D009532:Nickel