COMPARATIVE FOURIER TRANSFORM INFRARED AND X-RAY POWDER DIFFRACTION ANALYSIS OF NATURALLY OCCURRED K-FELDSPARS

 
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2010 (EN)
COMPARATIVE FOURIER TRANSFORM INFRARED AND X-RAY POWDER DIFFRACTION ANALYSIS OF NATURALLY OCCURRED K-FELDSPARS (EN)

Koroneos, A.
Zorba, T.
Soldatos, T.
Paraskevopoulos, K. M.
Theodosoglou, E.

Natural K-feldspars from igneous rocks have been examined by means of X-ray powder diffraction(XRPD) and Fourier transform infrared (FTIR) spectroscopy in the spectral range 400-1400 cm-1,where the Si-Al-O bonds exhibit the dominant vibrations. From the XRPD analysis three specieshave been distinguished, i.e. microclines (3 samples), orthoclases (4 samples) and sanidines (3 samples);their unit cell parameters were calculated. The FTIR transmittance spectra of all sampleshave common bands at 426, 463, 584, 604, 726 and 772 cm-1 and some additional features. The spectraof sanidine and orthoclase exhibit fewer and broader bands than the microclines’, especially inthe area 1000-1200 cm-1. The differences in their spectra are located in four bands. The bands ataround 536-538 and 646-648 cm-1 in the spectrum of microcline, are shifted at around 542-544 and640-642 cm-1 in the spectrum of orthoclase and at around 546 and 636 cm-1 in the spectrum of sanidine.Four bands at 1010, 1050, 1090 and 1136 cm-1 in the spectra of microcline are substitutedwith two quite broad bands at about 1030 and 1125 cm-1 in the spectra of orthoclase and sanidine.These differences are attributed to different degree of Al-Si ordering in the structure of K-feldspars. (EN)

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microcline (EN)
orthoclase (EN)
FTIR (EN)
XRPD (EN)
sanidine (EN)

Ελληνική Γεωλογική Εταιρεία (EL)
Geological Society of Greece (EN)

Δελτίο της Ελληνικής Γεωλογικής Εταιρίας

2010-01-01


Geological Society of Greece (EN)

0438-9557
2529-1718
Δελτίο της Ελληνικής Γεωλογικής Εταιρείας; Vol 43, No 5 (2010): 12th International Conference of the G.S.G.; 2752-2761 (EL)
Bulletin of the Geological Society of Greece; Vol 43, No 5 (2010): 12th International Conference of the G.S.G.; 2752-2761 (EN)

Copyright (c) 2017 E. Theodosoglou, A. Koroneos, T. Soldatos, T. Zorba, K. M. Paraskevopoulos (EN)



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