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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
FTIR spectra of tested materials after exposure to alkaline carbonate (250 °C, 40 days) and 3 cycles of thermal shock (one cycle: 600 °C heat overnight → cold water quenching for 10 min).