An infrared spectroscopic study of hydrogen feldspar (HAlSi3O8)

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  • H. Behrens
  • G. Muller

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Original languageEnglish
Pages (from-to)15-24
Number of pages10
JournalMineralogical magazine
Volume59
Issue number1
Publication statusPublished - Mar 1995

Abstract

Hydrogen in H-feldspar obtained by ion-exchange was studied in the spectral range 1000-5500 cm-1 by single crystal IR microspectroscopy. Spectra were almost identical for H-feldspars prepared either from sanidine or from adularia. Two bands in the middle-infrared were identified by D/H exchange as OH vibration modes. One broad band with a maximum at 3000 cm-1 and shoulders at 2800, 3200 and 3500 cm-1 confirms previous work. An additional OH absorption band with a maximum at 2485 cm-1 was observed for the first time in feldspars. The pleochroisms of the OH absorption bands suggests that the H-feldspar is composed of two phases, an amorphous phase and a feldspathic phase. The experimental results imply that hydrogen is incorporated in the H-feldspars as protons attached to bridging oxygen as well as to non-bridging oxygen. The complex structure of the IR spectra implies that the protons are distributed over a large number of sites in the cation cavity of the feldspars. -from Authors

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An infrared spectroscopic study of hydrogen feldspar (HAlSi3O8). / Behrens, H.; Muller, G.
In: Mineralogical magazine, Vol. 59, No. 1, 03.1995, p. 15-24.

Research output: Contribution to journalArticleResearchpeer review

Behrens H, Muller G. An infrared spectroscopic study of hydrogen feldspar (HAlSi3O8). Mineralogical magazine. 1995 Mar;59(1):15-24. doi: 10.1180/minmag.1995.59.394.02
Behrens, H. ; Muller, G. / An infrared spectroscopic study of hydrogen feldspar (HAlSi3O8). In: Mineralogical magazine. 1995 ; Vol. 59, No. 1. pp. 15-24.
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AU - Behrens, H.

AU - Muller, G.

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N2 - Hydrogen in H-feldspar obtained by ion-exchange was studied in the spectral range 1000-5500 cm-1 by single crystal IR microspectroscopy. Spectra were almost identical for H-feldspars prepared either from sanidine or from adularia. Two bands in the middle-infrared were identified by D/H exchange as OH vibration modes. One broad band with a maximum at 3000 cm-1 and shoulders at 2800, 3200 and 3500 cm-1 confirms previous work. An additional OH absorption band with a maximum at 2485 cm-1 was observed for the first time in feldspars. The pleochroisms of the OH absorption bands suggests that the H-feldspar is composed of two phases, an amorphous phase and a feldspathic phase. The experimental results imply that hydrogen is incorporated in the H-feldspars as protons attached to bridging oxygen as well as to non-bridging oxygen. The complex structure of the IR spectra implies that the protons are distributed over a large number of sites in the cation cavity of the feldspars. -from Authors

AB - Hydrogen in H-feldspar obtained by ion-exchange was studied in the spectral range 1000-5500 cm-1 by single crystal IR microspectroscopy. Spectra were almost identical for H-feldspars prepared either from sanidine or from adularia. Two bands in the middle-infrared were identified by D/H exchange as OH vibration modes. One broad band with a maximum at 3000 cm-1 and shoulders at 2800, 3200 and 3500 cm-1 confirms previous work. An additional OH absorption band with a maximum at 2485 cm-1 was observed for the first time in feldspars. The pleochroisms of the OH absorption bands suggests that the H-feldspar is composed of two phases, an amorphous phase and a feldspathic phase. The experimental results imply that hydrogen is incorporated in the H-feldspars as protons attached to bridging oxygen as well as to non-bridging oxygen. The complex structure of the IR spectra implies that the protons are distributed over a large number of sites in the cation cavity of the feldspars. -from Authors

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