Database of Zeolite Structures
Framework Type *BEA
Cell Parameters: tetragonal P 41 2 2 (# 91)
    a = 12.6320 Å b = 12.6320 Å c = 26.1860 Å  
  α = 90.000° β = 90.000° γ = 90.000°  
Volume = 4178.4 Å3  
RDLS = 0.0022  
  Framework density (FDSi): 15.3 T/1000 Å3  
  Topological density: TD10 = 805 TD = 0.704545  
Ring sizes (# T-atoms): 12  6  5  4    
Channel dimensionality: Topological (pore opening > 6-ring): 3-dimensional  
  Maximum diameter of a sphere:  
  that can be included 6.68 Å  
that can diffuse along a:   5.95 Å b:   5.95 Å c:   5.95 Å  
Accessible volume: 20.52   %  
Secondary Building Units: combinations only          
Composite Building Units:
mor (t-tes )
mtw (t-mtw )
Natural Tiling t-bea-1 t-bea-2 t-bet t-mtw t-tes t-umx
* Disordered Type Material
The Type Material of this Framework Type is disordered. An ordered framwork structure is given here to facilitate the discription, but no bulk material with this stucture is presently known. A brief description of the disorder is given below. For more details see Intergrowth Families (PDF) and/or the original publication.
Brief description of the disorder
The disorder in *BEA can be described in terms of the ordered 'layer' shown on the right (last 2 images in green). Each 'layer' is rotated by ± 90° with respect to the previous one. In a normal synthesis the stacking is random.

Effect of the disorder on the channel system
The stacking order does not cause any blocking of the 3-dimensional 12-ring channel system.
Framework images
(click on icon for larger image)

Viewed along [100]

projection along [100]
projection along [001] with depth fading
viewed along [001]
12-ring channel viewed normal to [100]
channel intersection viewed normal to [001]
'layer' normal to [001], viewed along [001]
'layer' normal to [001], viewed along [100]


Year code assigned 1992
Data last updated Jul 1, 2007