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Natural CaO-TiO2-SiO2 based ceramics

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Author(s): Jelena Pantić | Volker Kahlenberg | Vesna Poharc-Logar | Aleksandar Kremenović

Journal: Processing and Application of Ceramics
ISSN 1820-6131

Volume: 5;
Issue: 2;
Start page: 79;
Date: 2011;
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Keywords: Sphene | Natural precursor | Structure analysis

ABSTRACT
Lešnica river deposits consist of a large number of minerals of different grain sizes including sphene. Since it is very difficult to obtain pure monophase titanite by different synthetic routes (sol-gel, coprecipitation, combustion, spray pyrolysis and hydrothermal method), the aim of this work was to study the structure of the sphene from the Lešnica river deposits and possibility of using it as a natural precursor for CaO-TiO2-SiO2 based ceramics. The sphene from Lešnica was analyzed by different methods: tristimulus colorimetry, infrared spectroscopy, electron microprobe and X-ray single crystal diffraction. It was confirmed that Al, Fe, Mn and P are present in the sphene structure and proposed that corresponding structural formula could be: (Ca2+1.008 Mn2+0.002)1.010(Ti4+0.901 Fe3+0.033 Al3+0.060 P5+0.001)0.995 Si4+1.024 O2-5.
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Tango Jona
Tangokurs Rapperswil-Jona