The influence of mineralogical composition on the colour of clay body |
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| Authors: | V. Valanciene R. Siauciunas J. Baltusnikaite |
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| Affiliation: | 1. Department of Silicate Technology, Kaunas University of Technology, Radvilenu str. 19, 50270 Kaunas, Lithuania;2. Department of Textiles Technology, Kaunas University of Technology, Studentu str. 56, 51424 Kaunas, Lithuania;1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, PR China;2. Institute of Material Science and Engineering, Ocean University of China, Qingdao 266100, PR China;3. Institute of Marine Material Science and Engineering, Shanghai Maritime University, Shanghai 201306, PR China;1. Shaanxi Engineering Laboratory for Industrial Design, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. School of Design and Art, Shaanxi University of Science & Technology, Xi''an, 710021, PR China;1. The National Center for Building Systems, King Abdulaziz City for Science and Technology, KACST, Riyadh 11442, Saudi Arabia;2. Dipartimento di Ingegneria Industriale, University of Padova, Italy;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16801, USA;1. Department for the History of Science and Scientific Archaeology, University of Science and Technology of China, No.96 Jin Zhai Road, Hefei, Anhui 230026, China;2. Anhui Museum, No. 268, Huaining Road, Hefei, Anhui Province, China |
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| Abstract: | By using methods of Mössbauer spectroscopy, X-ray diffraction and colorimetrics analysis, the dependence of the colour of a ceramic body on its mineralogical composition was determined. In order to achieve this objective, the mineralogical composition and colour parameters of the Girininkai deposit (Lithuania) easily fusible clay and its mixture with the glauconite rock during firing at 600, 800, 1000, and 1025 °C were investigated in detail. By changing firing temperature from 600 to 1025 °C and duration of isothermal exposure from 0.5 to 4 h the amount of iron in hematite increases 5 times, whereas the amount of Fe3+ incorporated into the crystal lattice of other compounds diminishes 3–4 times if compared with natural clay. For this reason, the value of red colour coordinate increases from 18.44 to 23.65 NBS units and the ceramic body darkens and becomes redish brown. The colour can be intensified even more by adding to the forming mass finely ground glauconite. |
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