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in press
ACL
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R.Valcarenghi, B.Silva Greatti, R.Ferrari Muniz, V.Santaella Zanuto, A.Paulla Simon, R.Schneider, R.Dosciatti Bini, M.Antônio Fiori, M.Vigier, E.Veron, M.Allix, M.Sandrini, M.Paulo Belançon, 'Oxyfluoride glasses obtained through incorporation of ${\rm CaF}_2$ into photovoltaic cover glass melts', J. Am. Ceram. Soc. (in press) doi:10.1111/jace.70252
The glass industry has limited options to mitigate its environmental footprint,
and the demand for cover glass to produce photovoltaic panels continues to
increase. Currently, the majority of this special type of glass is not being recycled;
therefore, this work proposes to reuse it as raw material to obtain oxyfluoride
glasses. The incorporation of CaF 2 and the increasing Na 2 CO 3 content resulted
in a melting temperature of about 1200◦ C, significantly lower than in soda-lime
glasses, contributing to the environmental benefits of reusing end-of-life cover
glass. The obtained samples show high transparency and thermal stability, allow-
ing the cover glass to make up to 80% of its weight. XRF analysis was employed
to determine the elemental composition of the samples, while XRD and Raman
indicated that by adding CaF2 the glass network was depolymerized. In situ XRD
as a function of temperature showed the formation of a few crystalline phases in
these oxyfluoride samples, evidencing their potential to be explored as a matrix to
obtain different glass-ceramics. The combination of the glass properties indicates
that this method and the resulting material can contribute to reducing the envi-
ronmental impact of the glass industry. Furthermore, new glass or glass-ceramic
materials can be obtained at a reduced temperature compared to soda-lime glass,
while cover glass, being the primary raw material, could reduce the need to
extract minerals from nature.
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