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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/132320
Título: 
Raman and infrared investigations of glass and glass-ceramics with composition 2Na2O·1CaO·3SiO2
Autor(es): 
Instituição: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
ISSN: 
0884-2914
Resumo: 
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.
Data de publicação: 
1-Jan-1994
Citação: 
Journal of Materials Research, v. 9, n. 1, p. 216-225, 1994.
Duração: 
216-225
Publicador: 
Materials Research Society
Palavras-chaves: 
  • Amorphous materials
  • Band structure
  • Ceramic materials
  • Crystal orientation
  • Crystals
  • Infrared spectroscopy
  • Molecular structure
  • Molecular vibrations
  • Raman spectroscopy
  • Scanning electron microscopy
  • Spectrum analysis
  • Bending vibrations
  • Glass ceramics
  • Glass
Fonte: 
http://dx.doi.org/10.1557/JMR.1994.0216
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/132320
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