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The influence of Zn containing components on the synthesis of Z-phase

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Author(s): Baltakys M. | Siauciunas R. | Jauberthie R. | Baltakys K.

Journal: Science of Sintering
ISSN 0350-820X

Volume: 45;
Issue: 1;
Start page: 49;
Date: 2013;
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Keywords: calcium silicate hidrate (CSH) | Z-phase | zinc | hydrothermal treatment

ABSTRACT
The influence of Zn containing compounds on the formation of Z-phase during hydrothermal treatment at 200°C temperature was investigated. The molar ratio of primary mixtures was CaO/(SiO2 + ZnO) = 0.55 and ZnO/(SiO2 + ZnO) = 0; 0.025 (it corresponds 2.27 % ZnO in the mixture). Compounds containing Zn2+ ions were used: soluble in water Zn(NO3)2•6H2O and insoluble in water 5ZnO•2CO2•4H2O. It was determined that the formation of Z-phase increases approximately twice due to influence of Zn2+ ions from the mixture. The high crystalline compound formed after 4 hours, while in the mixtures without additives - after 8 h of hydrothermal synthesis at 200°C temperature. Moreover, Zn2+ ions penetrate into Z-phase crystal lattice by exchanging Ca2+ ions. It was observed that insoluble 5ZnO•2CO2•4H2O additive has no essential influence on the begining of Z-phase formation, but it promotes Z-phase recrystallization into gyrolite. The products were characterized using X-ray powder diffraction, simultaneous thermal analysis, FT-IR spectra and scanning electron microscopy.
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