CRYSTAL-STRUCTURE DETERMINATION OF ZEOLITE-N FROM SYNCHROTRON X-RAY-POWDER DIFFRACTION DATA

The crystal structure of zeolite N (EDI type framework) has been refin ed using high-resolution synchrotron powder diffraction data. The stru cture is pseudotetragonal. The orthorhombic distortion is observable a s a slight line broadening, a=990.41(2), b=988.60(2), c=1309.00(2) pm, space group 1222, No. 23, Z=1, for the composition K12Al10Si10O40Cl2 . 8H(2)O. The AlO4 and SiO4 tetrahedra form an ordered arrangement sim ilar to that in edingtonite. The potassium and chlorine atoms form def ormed ClK6 octahedra positioned in the channels running along [001].