, Volume 163, Issue 2, pp 144-157

Raman spectra of crystalline double sulphates

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Abstract

Raman spectra of single crystals of K2M(SO4)2 · 6 H2O where M=Mg, Zn, Ni or Co have been recorded for the first time usingλ 2537 as the exciting radiation. The corresponding five single sulphates have also been studied. Interesting results concerning the substitution of magnesium, zinc, nickel or cobalt in the double sulphate lattice on the sulphate frequencies are observed. The lattice spectra of these double sulphates are analysed group theoretically and discussed in relation to the lattice spectra of the corresponding individual sulphates. Certain new results concerning the Raman spectra of the individual sulphates have also been obtained and in the case of CoSO4 · 7 H2O the spectrum has been recorded for the first time.

I wish to express my sincere thanks to Professor R. S.Krishnan for his guidance and valuable suggestions in the preparation of this paper. I also thank the Council of Scientific and Industrial Research, for awarding me a Junior Research Fellowship.