title: Effect of Fe2O3 concentration on the structure of the SiO2-Na2O-Al2O3-B2O3 glass system.
abstract: The structural properties of the glass matrix 40SiO(2)·30Na(2)O·1Al(2)O(3)·(29-x)B(2)O(3)·xFe(2)O(3) (mol%), 0.0≤x≤29.0 were studied by X-ray diffraction (XRD), differential thermal analysis (DTA) and Raman and infrared spectroscopy (FT-IR). XRD demonstrated Fe(3)O(4) crystal formation for Fe(2)O(3) concentrations of 29.0 mol%. DTA showed that glass transition and crystallization temperatures changed as a function of Fe(2)O(3) concentration and that these alterations were related to structural change in the glass system. Interesting aspects of Raman and FT-IR spectra were found, and this gives information about of the structure changes in Si-O-Si units of these glasses as a function of Fe(2)O(3) concentration.
authors.affiliation: Laboratório de Novos Materiais Isolantes e Semicondutores, Instituto de Física, Universidade Federal de Uberlândia, CEP 38400-902, Uberlândia, MG, Brazil. noelio@ufu.br
authors.forename: Noelio O
authors.initials: NO
authors.lastname: Dantas
authors.forename: Walter E F
authors.initials: WE
authors.lastname: Ayta
authors.forename: Anielle C A
authors.initials: AC
authors.lastname: Silva
authors.forename: Nilo F
authors.initials: NF
authors.lastname: Cano
authors.forename: Sebastião W
authors.initials: SW
authors.lastname: Silva
authors.forename: Paulo C
authors.initials: PC
authors.lastname: Morais
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D001896:Boron Compounds / Q000737:chemistry*; D003460:Crystallization; D004055:Differential Thermal Analysis; D005290:Ferric Compounds / Q000737:chemistry / Q000494:pharmacology*; D005898:Glass / Q000737:chemistry*; D015394:Molecular Structure; D009994:Osmolar Concentration; D010087:Oxides / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017670:Sodium Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D001896:Boron Compounds; D005290:Ferric Compounds; D010087:Oxides; D017670:Sodium Compounds; C000499:ferric oxide; C096707:sodium oxide; C042168:boron oxide; D012822:Silicon Dioxide; D000537:Aluminum Oxide