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Issue 8, 2019
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Morphology, topography, and crystal rotation during surface crystallization of BaO/SrO/ZnO/SiO2 glass

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Abstract

The initial stages of surface crystallization of glass with the composition 8BaO·8SrO·34ZnO·50SiO2 (mol%) are studied with respect to crystal orientation and morphology. Therefore, different microscopic techniques, such as laser scanning microscopy and scanning electron microscopy in combination with electron backscatter diffraction, were used to study the crystal growth at the initial surface, i.e. cross sections were not prepared. The precipitating crystalline phase has the composition Ba1−xSrxZn2Si2O7 with x ≈ 0.5 and shows highly anisotropic thermal expansion properties. Various morphologies were found which can be correlated with different crystal orientations. During growth, the crystals show a strong tendency towards orientation changes which lead to an unusual and rough surface. This study also explains the crystallization mechanism, according to which crystals at first spread at the surface and afterwards grow into the volume of the glass. The orientation changes, the morphology of the crystals and the resulting topography were correlated.

Graphical abstract: Morphology, topography, and crystal rotation during surface crystallization of BaO/SrO/ZnO/SiO2 glass

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Publication details

The article was received on 04 Dec 2018, accepted on 16 Jan 2019 and first published on 21 Jan 2019


Article type: Paper
DOI: 10.1039/C8CE02057D
Citation: CrystEngComm, 2019,21, 1320-1328

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    Morphology, topography, and crystal rotation during surface crystallization of BaO/SrO/ZnO/SiO2 glass

    M. Kracker, T. Zscheckel, C. Thieme, K. Thieme, T. Höche and C. Rüssel, CrystEngComm, 2019, 21, 1320
    DOI: 10.1039/C8CE02057D

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