Abstract
The effect of barium ions on K2O-TiO2-SiO2 (KTS) glass soaked in molten Ba(NO3)2 is reported. In the soaking process, the glass surface crystallized into Ba2TiSi2O8 with barium ions derived from the molten solution. The orientation and crystalline phase of the soaked glasses were studied by X-ray diffraction (XRD) for various soaking times and additional heat treatment. The penetration of barium ions into the glass was verified by the direct methods of X-ray photoelectron spectroscopy (XPS) depth profiling and Scanning electron microscopy-energy dispersive X-ray spectrometer (SEM-EDS). It is suggested that the formation of the surface crystalline layer occurred by the reaction between the barium ions and glass components and the soaking temperature provides enough energy for the crystallization of Ba2TiSi2O8 on the surface.
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