Artigo Acesso aberto Revisado por pares

An infrared and Raman spectroscopic study of natural zinc phosphates

2004; Elsevier BV; Volume: 60; Issue: 7 Linguagem: Inglês

10.1016/j.saa.2003.08.009

ISSN

1873-3557

Autores

Ray L. Frost,

Tópico(s)

Clay minerals and soil interactions

Resumo

Zinc phosphates are important in the study of the phosphatisation of metals. Raman spectroscopy in combination with infrared spectroscopy has been used to characterise the zinc phosphate minerals. The minerals may be characterised by the patterns of the hydroxyl stretching vibrations in both the Raman and infrared spectra. Spencerite is characterised by a sharp Raman band at 3516 cm−1 and tarbuttite by a single band at 3446 cm−1. The patterns of the Raman spectra of the hydroxyl stretching region of hopeite and parahopeite are different in line with their differing crystal structures. The Raman spectrum of the PO4 stretching region shows better band separated peaks than the infrared spectra which consist of a complex set of overlapping bands. The position of the PO4 symmetric stretching mode can be used to identify the zinc phosphate mineral. It is apparent that Raman spectroscopy lends itself to the fundamental study of the evolution of zinc phosphate films.

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