We report on micro-Raman spectroscopy as a tool to improve the quality of the industrial glass production. Crystalline inclusions, commonly called stones, are very dangereous defects present in industrial glass products. To minimize this technological problem, the detailed knowledge of the formation and transformation processes of these defects is required, and a complete identification of the different phases requires a multianalytical approach. Micro-Raman measurements were performed on a series of laboratory samples with different chemical compositions. Performing linear scanning and mapping of Raman features, we obtained a well-defined characterization of the evolution and nature of stones. In addition, information on the crystallization degree of the reaction layers was obtained by correlating the shape and intensity of the photoluminescence of Cr3+ impurities.
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