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- W2520662645 abstract "The article presents the studies of feldspar-quartz raw material from deposits in the Strzegom-Sobotka massif (Lower Silesia, SW Poland). The goal of this paper was to establish the causes of colour variation of samples after firing at 1200°C. The scope of research encompassed among others a detailed chemical analysis of raw material and Mossbauer studies of two selected samples, as well as measurements of colour parameters after firing (L*, a*, b*). The chemical analysis revealed that the samples of darkest colours are characterized by the highest contents of: Fe2 O3 , MnO, Th, U, Ce, Nd. The Mossbauer studies demonstrated the quantitative predominance of 2+ over Fe3+ in the sample of relative darker hue, while its spectra parameters suggest that Fe2+ is located in octahedral coordination that can result in cold blue tint. Ions Fe3+ , occupying probably the tetrahedral sites, prevail in the other analysed sample, which probably causes its warm, reddish shade. The above-mentioned examinations lead to the finding that colour of analyzed samples after firing originates from ions of transition elements of various valence states and coordination (especially iron), as well as some REE and actinides." @default.
- W2520662645 created "2016-09-23" @default.
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- W2520662645 date "2016-01-01" @default.
- W2520662645 modified "2023-10-14" @default.
- W2520662645 title "Origin of colour after firing feldspar-quartz raw material from the Sobotka region (Lower Silesia, SW Poland)" @default.
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- W2520662645 doi "https://doi.org/10.1051/e3sconf/20160801022" @default.
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