Database of Disordered Zeolite Structures
 
Intergrowth Family FAU-EMT
Periodic Building Unit
 
  Periodic Building Unit (PerBU): faujasite layer  
 
  Layer symmetry P (3) m 1  
 
 
  References

    Newsam, J.M., Treacy, M.M.J., Vaughan, D.E.W., Strohmaier, K.G. and Mortier, W.J.
   "The structure of zeolite ZSM-20: mixed cubic and hexagonal stackings of faujasite sheets"
  Chem. Commun., , 493-495 (1989)

Connectivity pattern
Examples
The layers are stacked along the [001] direction using the following connectivity patterns

 
Symmetry
Operation*
Translation* Comment Image
i
None
  one inversion center shown as an open circle in the example
m
None
  mirrow plane shown as a solid line in the example
 

* relative to the previous layer


Effect on channel system
  The disorder does not block the channel system
Simplest ordered end members
The color of each layer reflects the symmetry/translation operation used to generate it from the previous layer (see table above).

 
  Polymorph FAU
 
Cell Parameters: cubic F d -3 m (# 227)
    a = 24.3450 Å b = 24.3450 Å c = 24.3450 Å  
  α = 90.0000° β = 90.0000° γ = 90.0000°  
Ring sizes (# T-atoms): 12 6 4  
Channel dimensionality: Topological (pore opening > 6-ring): 3-dimensional  
Channel system: <111> 12 7.4 x 7.4***  
 
In this space group and setting, the PerBUs are stacked along [111]
Adjacent layers generated by same the connectivity pattern (same basic color) are shown with different shades for clarity


Note: This polymorph corresponds to the ordered framework FAU
 
 
  Polymorph EMT
 
Cell Parameters: hexagonal P 63/m m c (# 194)
    a = 17.2150 Å b = 17.2150 Å c = 28.0820 Å  
  α = 90.0000° β = 90.0000° γ = 120.0000°  
Ring sizes (# T-atoms): 12 6 4  
Channel dimensionality: Topological (pore opening > 6-ring): 3-dimensional  
Channel system: [001] 12 7.3 x 7.3* <-> [001] 12 6.5 x 7.5**  
 
In this space group and setting, the PerBUs are stacked along [001]
Adjacent layers generated by the same connectivity pattern (same basic color) are shown with different shades for clarity

Note: This polymorph corresponds to the ordered framework EMT
 
Disorder Example
 
  Simple example of a random stacking
 
  Adjacent layers generated by the same connectivity pattern (same basic color) are shown with different shades for clarity
There is no blocking of the 3D channel system.