%0 Journal Article
%T The influence of Zn containing components on the synthesis of Z-phase
%A Baltakys M.
%A Siauciunas R.
%A Jauberthie R.
%A Baltakys K.
%J Science of Sintering
%D 2013
%I International Institute for the Science of Sintering, Beograd
%R 10.2298/sos1301049b
%X The influence of Zn containing compounds on the formation of Z-phase during hydrothermal treatment at 200ˇăC 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 200ˇăC 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.
%K calcium silicate hidrate (CSH)
%K Z-phase
%K zinc
%K hydrothermal treatment
%U http://www.doiserbia.nb.rs/img/doi/0350-820X/2013/0350-820X1301049B.pdf