Abstract
Borosilicate glasses and glass ceramics in the system 30Na2O-2Al2O3-25SiO2-xFe2O3(43-x)B2O3 (x = 0 - 20 mol%) have been prepared and studied by distinguished techniques. X-ray diffraction (XRD), transmission electron microscope (TEM), electron diffraction pattern (EDP) and SEM experiments are applied to explore the induced structural changes. Nanometer-sized species of polycrystalline structure are formed particularly in low Fe2O3 containing glasses. The size of the crystallites is found to depend on Fe2O3 concentrations. It is ranged from 10 to 33 nanometers. Structurally, these materials are suggested to contain different components, crystalline component and an interfacial component which situated between the crystallized domains. Presence of these components affects the atomic arrangement without short- or long-range order. An intermediate range ordered structure is dominant in glass ceramics of Fe2O3 2O3 concentration, since more disordered structure of lower size is present. These structural changes are found to be connected with the role of Fe2O3 and Na2O in glasses. Na2O is the strong glass modifier in the studied composition region, while Fe2O3 is consumed also as a modifier in composition of 2O3 is mainly dominant in the composition region of higher iron oxide concentration (8 - 20 mol%).
Highlights
Glasses and glass ceramics containing metal oxide have a wide variety in most of industrial and technical applications [1] [2] [3]
An intermediate range ordered structure is dominant in glass ceramics of Fe2O3 < 8 mol%
The present paper aims to make use of our recent published work which based on NMR and FTIR spectroscopy [4] to shed more light on detailed structure of borosilicate glasses containing iron oxide
Summary
Glasses and glass ceramics containing metal oxide have a wide variety in most of industrial and technical applications [1] [2] [3]. El-Damrawi et al 14 cific composition from borosilicate glasses has been devoted as special sealants for Molten Carbonate Fuel Cells (MCFC) [2] [3] Both academic and technical advantages of borosilicate glasses have been correlated with some specific structural studies which were carried out on these materials. The present paper aims to make use of our recent published work which based on NMR and FTIR spectroscopy [4] to shed more light on detailed structure of borosilicate glasses containing iron oxide In this regard, XRD, ED spectroscopy, SEM and TEM are applied to give information on different range ordered structure which may be affected by changing Fe2O3 concentration in the studied glasses
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