Characterisation of prehnite by EPMA, Mössbauer, optical absorption and EPR spectroscopic methods

A sample of prehnite from Rayalaseema zone of Andhra Pradesh, India containing about 2.565 wt.% Fe 2O 3 is used in the present work. The mineral has been characterized by EPMA, optical absorption, EPR, NIR and Mössbauer techniques. Mössbauer studies confirm the presence of iron as an impurity in two...

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Veröffentlicht in:	Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2005-11, Vol.62 (1), p.71-75
Hauptverfasser:	Reddy, N.C. Gangi, Fayazyddin, S.Md, Reddy, R. Rama Subba, Reddy, G. Siva, Reddy, S. Lakshmi, Rao, P. Sambasiva, Reddy, B. Jagannatha
Format:	Artikel
Sprache:	eng
Schlagworte:	Aluminum Silicates - chemistry Electron Spin Resonance Spectroscopy - methods EPR studies Fe(III) Ferric Compounds - chemistry India Mössbauer studies NIR studies Octahedral environment Optical absorption studies Prehnite Spectrophotometry - methods Spectroscopy, Mossbauer - methods Transition Elements - chemistry
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Zusammenfassung:	A sample of prehnite from Rayalaseema zone of Andhra Pradesh, India containing about 2.565 wt.% Fe 2O 3 is used in the present work. The mineral has been characterized by EPMA, optical absorption, EPR, NIR and Mössbauer techniques. Mössbauer studies confirm the presence of iron as an impurity in two sites. An EPR study on powder sample confirm the presence of Fe(III) impurity in the mineral. Optical absorption spectrum also indicates that Fe(III) impurity is present in two sites with octahedral structure. NIR results are due to water fundamentals.
ISSN:	1386-1425
DOI:	10.1016/j.saa.2004.11.053