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Interpretation of the optical absorption spectrum ofNi-substituted lizardites

Published online by Cambridge University Press:  09 July 2018

A. Julg  and
O. Julg
A. Julg
Affiliation:
Laboratoire de Chimie Théorique, Université de Provence. Place V Hugo, 13331 Marseille Cedex 3, France
O. Julg
Affiliation:
Laboratoire de Chimie Théorique, Université de Provence. Place V Hugo, 13331 Marseille Cedex 3, France
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Extract

The spectrum of Ni-substituted lizardite, (Mg,Ni)3Si2O5(OH)4, has been discussed by many authors, who have successively given contradictory interpretations concerning the symmetry of the Ni-sites. Lakshman & Reddy (1973) affirmed that in garnierites Ni is in a tetrahedral site. Faye (1974) rejected this conclusion and showed that Ni2+ occupies an octahedral site. However, the Ni … O distance of 2·01 Å which he deduced from the intensity of the crystal field is unacceptable. Recently, using a completely different approach to the interpretation of the spectrum, Cervelle & Maquet (1982) claimed that Ni2+ occupies a six-coordinated site of C3v symmetry, and concluded that the mean Ni … O distance is 2·06 Å.

The aim of this note is to show that it is possible to interpret the spectrum of Ni-lizardite as arising from a predominantly octahedral field with a weak C2v component which provokes a small increase in width of the absorption bands.

Type
Notes
Information
Clay Minerals , Volume 19 , Issue 1 , February 1984 , pp. 107 - 111
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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References

Ballhausen, C.J. (1962) Introduction to Ligand Field Theory, pp. 238–254, McGraw-Hill, New York.Google Scholar
Bragg, L. & Claringbull, C.F. (1965) Crystal Structures of Minerals. G. Bell & Sons Ltd., London.Google Scholar
Cervelle, B.D. & Maquet, M. (1982) Cristallochimie des lizardites substituées Mg-Fe-Ni par spectrométrie visible et infrarouge proche. Clay Miner. 17, 377–392.CrossRefGoogle Scholar
Faye, G.H. (1974) Optical absorption spectrum of Ni2+ in garnierite: a discussion. Can. Miner. 12, 389–393.Google Scholar
Griffith, J.S. (1961) The Theory of Transition-Metal Ions. Cambridge Univ. Press.Google Scholar
Holmes, O.G. & McClure, D.S. (1957) Optical spectra of hydrated ions of the transition metals. J. Chem. Phys. 26, 1686–1694.CrossRefGoogle Scholar
Hutchings, M.T. (1954) Point charge calculations of energy levels of magnetic ions in crystalline electric fields. Solid State Physics 16, 227–273.CrossRefGoogle Scholar
Jørgensen, C.K. (1956) Crystal field studies II, Nickel(II) and Copper(II) complexes. Acta Chem. Scand. 10, 887–910.CrossRefGoogle Scholar
Julg, A. (1978) Crystals as Giant Molecules. Lecture Notes in Chemistry 9. Springer-Verlag, Berlin.CrossRefGoogle Scholar
Lakshman, S.U. & Reddy, B.J. (1973) Optical absorption spectrum of Ni2+ in garnierite. Proc. Ind. Acad. Sci. A 77, 269–278.CrossRefGoogle Scholar
Low, W. (1958) Paramagnetic and optical spectra of divalent nickel in cubic crystalline fields. Phys. Rev. 109, 247–255.CrossRefGoogle Scholar
Moore, C. (1949) Atomic Energy Levels. Natl. Bur. Stand, Washington.Google Scholar
Zauli, C. (1959) Monocentric integrals involving Slater's AO's with n = 3. Boll. Sci. Fac. Chimica Industr. Bologna XVII, 74–84.Google Scholar