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Raman and infrared investigations of glass and glass-ceramics with composition 2Na2O · 1CaO · 3SiO2

Published online by Cambridge University Press:  03 March 2011

Ervino C. Ziemath
Affiliation:
Departamento de Física, IGCE, Universidade Estadual Paulista, Cx. Postal 178, 13500-230-Rio Clao, SP, Brazil
Michel A. Aegerter
Affiliation:
Instituto de Física e Química de São Carlos, Universidade de São Paulo, Cx. Postal 369, 13560-970-São Carlos, SP, Brazil
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Abstract

Precursor glass and glass-ceramics with molar composition 2Na2O · ICaO · 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.

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Copyright
Copyright © Materials Research Society 1994

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