Effect of Cs content on K^sub 1-x^Cs^sub x^AlSi^sub 2^O^sub 6^ ceramic solidification forms

K1-xCsx-geopolymers with chemical compositions of about K,..~Cs~AlSi2O6nH2O were used as precursors to prepare K1-xCsxAlSi2O6 ceramic solidification forms through the thermal treatment method. The structures of K1-xCsxAlSi2O6 ceramic solidification forms obtained at different sintering temperatures have been characterized by X-ray diffraction, scanning electron microscopy and fourier transform infrared spectroscopy. It has been observed that the crystallization temperature and phase of K1-xCsxAlSi2O6 ceramic were significantly influenced by the Cs content. An increase in the Cs content resulted in a decrease in the crystallization temperature of the K1-xCsxAlSi2O6 cubic phase. K1-xCsxAlSi2O6 ceramic obtained at 850 °Celsius was lecucite cubic or pollucite cubic phase when x ≥ 0.2, and the lattice parameters of cubic phase increased with increasing of Cs content. However, leucite tetragonal phase formed at elevated heating temperature (1100 °Celsius and 1300 °Celsius) except for the case x = 0.3, 0.4, 0.5 and 1. The c/a ratio of leucite tetragorial phase obtained at 1100°Celsius and 1300 °Celsius was much more closed to I with Cs content increased, which made it hard to be indexed between cubic and tetragonal phase. In this case, leucite tetragonal phase could also be considered as pseudo-cubic phase. Additionally, the product consistency test leaching results showed that K1-xCsxAlSi2O6 ceramics possessed superior chemical durability.