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The effect of different platinum concentrations as nucleation agent in the BaO/SrO/ZnO/SiO2 glass system

: Vladislavova, L.; Kracker, M.; Zscheckel, T.; Thieme, C.; Rüssel, C.


Journal of Materials Science : JMS 53 (2018), No.16, pp.11204-11215
ISSN: 0022-2461
ISSN: 1573-4803
Journal Article
Fraunhofer IMWS ()

The recently reported solid solution of Ba1−xSr x Zn2Si2O7 has a similar structure to the high-temperature phase of BaZn2Si2O7 and possesses a coefficient of thermal expansion close to zero or even negative. Without nucleating agents, glasses in this system show solely surface crystallization. In order to stimulate volume crystallization, different quantities of platinum were added to the glass. The characteristic temperatures of the glasses were obtained by differential scanning calorimetry. In order to achieve volume crystallization, a two-step thermal treatment (nucleation and crystal growth) above the glass transition temperature was carried out. The phase identification was performed by X-ray diffraction, and the microstructure was studied by scanning electron microscopy including energy-dispersive X-ray spectroscopy and electron backscatter diffraction.