Neutron powder diffraction study of a Na,Cs-Rho zeolite

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Abstract
The crystal structure of a Na, Cs-Rho zeolite was studied at 373 K (Na 8.4 Cs 3.2 Si 36.4 Al 11.6 O 96 · 5D 2 O) by neutron powder diffraction and Rietveld profile analysis. It crystallizes in the noncentrosymmetric space group I [unk]3 m and has a unit cell constant a = 14.6566(4) Å. The final residuals are R I = 9.65% and R wp = 8.01%. The distortion of the (Al,Si)O 2 -framework of this zeolite fits into the pattern established for other noncentrosymmetric Rho zeolites. Particularly, the ellipticity of the eight-ring and the pore size are strictly a function of the cell constant of the zeolite. The mean distance (Al,Si)-O is observed to be 1.636 Å, in excellent agreement with the mean (Al,Si)-O distance of 1.638 Å calculated for the Si and Al content of our sample.