Issue 10, 2011

Composition and texture of barium silicate crystals in fresnoite glass-ceramics by various scanning electron microscopic techniques

Abstract

Highly oriented fresnoite glass-ceramics were prepared from a non-stoichiometric melt (Ba2TiSi2O8 + 0.75 SiO2) by electrochemically induced nucleation. By using electron microscopy, cathodoluminescence (CL), electron backscatter diffraction (EBSD) and energy dispersive X-ray (EDX) spectroscopy as well as wavelength dispersive X-ray (WDX) spectroscopy, two additional barium silicate phases free of titanium were identified besides the fresnoite phase predominantly occurring throughout the sample. A barium disilicate phase (BaSi2O5) was found within a radius of approximately 300 µm from the Pt-wire where the nucleation was induced. At distances >300 µm a phase with the composition BaSiO3 was detected which occurred in between the large dendritic fresnoite crystals next to an additional glassy phase which mainly consists of SiO2. Both barium silicate phases show more intense cathodoluminescence than the fresnoite phase and the maxima in the attributed spectra were shifted to smaller wavelengths in comparison to fresnoite.

Graphical abstract: Composition and texture of barium silicate crystals in fresnoite glass-ceramics by various scanning electron microscopic techniques

Article information

Article type
Paper
Submitted
23 Nov 2010
Accepted
05 Jan 2011
First published
02 Feb 2011

CrystEngComm, 2011,13, 3383-3389

Composition and texture of barium silicate crystals in fresnoite glass-ceramics by various scanning electron microscopic techniques

M. Nagel, W. Wisniewski, G. Völksch, C. Borschel, C. Ronning and C. Rüssel, CrystEngComm, 2011, 13, 3383 DOI: 10.1039/C0CE00876A

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