Database of Zeolite Structures
 

Framework Type CHA
Reference Material
  Material Name: Chabazite    
 
Chemical Formula:		  
|Ca6 (H2O)40 |1/3 [Al12Si24O72]1/3-CHA		  
   
Unit Cell:§ 		 
rhombohedral
 R -3 m (# 166)
    a' = 9.4200 Å b' = 9.4200 Å c' = 9.4200 Å  
    α' = 94.470° β' = 94.470° γ' = 94.470°  
   
Framework Density: 		 
14.5 T/1000 Å3
 
  
Channels: 		 
[001] 8 3.8 x 3.8*** (variable due to considerable flexibility of framework)
Dimensionality
  Sorption (molecular cross section > 3.4Å): 3-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
   
References:
  Dent, L.S. and Smith, J.V.
  "Crystal structure of chabazite, a molecular sieve"
Nature, 181, 1794-1796 (1958)
Material name:   Chabazite
Chemical formula:   [Al12Si24O72]1/3-CHA
  § Smith, J.V., Rinaldi, F. and Dent Glasser, L.S.
  "Crystal structures with a chabazite framework. II. Hydrated Ca-chabazite at room temperature"
Acta Crystallogr., 16, 45-53 (1963)
 
  
Name and Code derivation:
    Chabazite
  CHA
 
 
§ Chemical Formula and Unit Cell taken from the reference marked with this sign
Limiting Rings
 
8-ring viewed normal to [001]


Copyright © 2017 Structure Commission of the International Zeolite Association (IZA-SC)