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|Title:||Raman and infrared investigations of glass and glass-ceramics with composition 2Na2O·1CaO·3SiO2|
|Author(s):||Ziemath, Ervino C.|
Aegerter, Michel A.
|Year of Publication:||1994|
|OPUS Source:||Journal of materials research. - 9. 1994, 1, S. 216-225|
|SWD key words:||Präkursor|
|DDC notations:||500 Science|
|Publikation type:||Journal Article|
|Abstract:||Precursor glass and glass-ceramics with molar composition 2Na2O·1CaO·3SiO2 are studied by infrared, conventional, and microprobe Raman techniques. The Gaussian deconvoluted Raman spectrum of the glass presents bands at 625 and 660 cm-1, attributed to bending vibrations of Si-O-Si bonds, and at 860, 920, 975 and 1030 cm-1, attributed to symmetric stretching vibrations of SiO4 tetrahedra with 4, 3, 2, and 1 nonbridging oxygens, respectively. The Raman microprobe spectrum of a highly crystallized sample presents two narrow and intense bands at about 590 and 980 cm-1, associated with vibrations of SiO4 tetrahedra with two nonbridging oxygens, in agreement with the predicted chain-like structure of crystalline metasilicates. Scanning electron microscopy shows that the crystals distributed in partially crystallized samples have a spherical shape, built up by radially oriented needle-like single crystals. The Raman microprobe spectra of these spherulites show that they still contain residual amorphous material. A comparison of Raman and infrared spectra of amorphous and highly crystallized samples is presented.|
|Link to this record:||urn:nbn:de:bsz:291-scidok-23513|
|Date of registration:||4-Sep-2009|
|Faculty:||SE - Sonstige Einrichtungen|
|Department:||SE - INM Leibniz-Institut für Neue Materialien|
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