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Title	LOW-FREQUENCY HYDROXYL ION MOTIONS IN LAYER SILICATE MINERALS
Accession No	00237382
Authors	Naumann, A W; Safford, G J; Mumpton, F A
Conference Title	Clays & Clay Minerals Conference Proc
Publication Date	19660000
Abstract	NEUTRON INELASTIC SCATTERING SPECTRA FOR KAOLINITE, DICKITE, PYROPHYLLITE, AND MUSCOVITE SHOW A CHARACTERISTIC PEAK BETWEEN MINUS 850 AND 910 CM, WHILE THOSE FOR CHRYSOTILE, ANTIGORITE, TALC, PHLOGOPITE, AND AMPHIBOLE MINERALS SHOW CHARACTERISTIC PEAKS AT MINUS 620--650 CM AND MINUS 460--510 CM. THESE PEAKS CORRESPOND TO LOCALIZED TORSIONAL OSICLLATIONS OF HYDROXYL ION HYDROGEN GROUPS. LOWER-FREQUENCY PEAKS ARE ALSO OBSERVED AND ARE ASSOCIATED WITH OPTICAL AND ACOUSTIC MODES INVOLVING HINDERED TRANSLATIONS. WITHIN A SERIES THE SIMILARITY IN THE SHAPES AND THE POSITIONS OF THE PEAKS INDICATES THAT THE MOTIONS OF THE HYDROXYL ION HYDROGEN GROUPS ARE DETERMINED PRIMARILY BY NEAREST-NEIGHBOR CATION COORDINATION. DIFFERENCES BETWEEN THE TWO SERIES CAN BE ATTRIBUTED TO THE DIFFERENT ENVIRONMENTS WHEN THE OCTAHEDRAL LAYER OF THE LATTICE IS POPULATED EITHER BY TWO OR BY THREE CATIONS. THE SPECTRA OF THE HYDRATED MINERALS, MONTMORILLONITE, HECTORITE, AND HALLOYSITE, SHOW LINES CHARACTERISTIC OF LIQUID WATER. UPON DEHYDRATION, PEAKS CORRESPONDING TO THE MOTIONS OF STRUCTURAL HYDROXYL ION HYDROGEN UNITS ARE OBSERVED. /AUTHOR/
Supplemental Information	Vol 26, pp 367-383, 7 FIG, 3 TAB, 22 REF
TRT Terms	Cations ; Hydroxides ; Ions ; Kaolinite ; Montmorillonite ; Motion ; Neutrons ; Scattering ; Silicates
Other Terms	Inelastic scattering; Neutron scattering
Subject Areas	H64 SOIL SCIENCE
TRIS Files	HRIS
Database	TRIS Online

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