EXPERIMENTAL AND CALCULATED X-RAY-POWDER DIFFRACTION DATA FOR CESIUM TITANIUM SILICATE, CSTISI2O6.5 - A NEW ZEOLITE

Standardized experimental and calculated X-ray powder diffraction data for a new synthetic zeolite, cesium titanium silicate, CsTiSi2O6.5, a re reported. In addition, a structure model in space group Ia(3)d (230 ), which is isomorphous with the mineral pollucite (CsAlSi2O6 . xH(2)O ), is proposed for CsTiSi2O6.5. This structure model is the basis of t he reported calculated X-ray powder diffraction data for CsTiSi2O6.5. The experimental pattern for CsTiSi2O6.5 shows this compound crystalli zes in a body-centered cubic (BCC) unit cell with a = 13.8423 (1) Angs trom. The measured value of the reference intensity ratio (I/Ic) of Cs TiSi2O6.5 is 2.37, while the contrasting calculated value of I/Ic is 4 .45. The experimental density (D-m) of CsTiSi2O6.5 is 3.48 +/- 0.09 g/ cm(3), in agreement with the calculated density (D-x) of 3.42 g/cm(3). Chemical analysis of CsTiSi2O6.5 by atomic absorption spectroscopy gi ves its composition as 54 +/- 2 wt% Cs; 23 +/- 2 wt% Ti; 23 +/- 2 wt% Si, which compares favorably with the theoretical composition of 56 wt % Cs; 20 wt% Ti; 24 wt% Si. (C) 1997 International Centre for Diffract ion Data.