Hydrothermal synthesis of (Zr_0.33 Ti_0.67) O₂–srilankite in the system ZrO₂TiO₂H₂OMF; (M = Na, K)

Abstract

Abstract The hydrothermal synthesis in the system ZrO 2 TiO 2 H 2 OMF; (M = Na, K) is discussed for the temperature range 573 K–773 K and the pressure of 100 MPa to 150 MPa. Starting with Zr‐ and Ti‐ butoxides their co‐precipitated hydrolysates which had been annealed in different ways were used as initial products. The formation of mixed crystals (Zr, Ti)O 2 analogous to the rare mineral srilankite was dependent on the crystallinity and homogeneity of the initial products. 573 K and 100 MPa proved to be the most favourable conditions for synthesis. Higher temperatures (773 K) produced multiphase crystallizates of (Zr, Ti)O 2 , baddeleyite, anatas, and rutile.