Intergrowth Family CAN-SOD
Periodic Building Unit
| Periodic Building Unit (PerBU): | ABC-6 layer of hexagonally arranged (isolated) 6-rings | |||||
| Layer symmetry | P (6) m m | |||||
| 2D cell parameters | a = 13.05 Å | b = 13.05 Å | gamma = 120° | |||
| References |
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| Buhl, J.C. and Cramm, S. | |||
| "Synthesis of nanocrystalline nitrate enclathrated zeolite with intermediate framework structure between sodalite (SOD) and cancrinite (CAN)" | |||
| NSTI-Nanotech, , 284-287 (2011) | |||
Connectivity pattern
| Examples |
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The layers are stacked along the [001] direction using the following connectivity patterns
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* relative to the first layer |
| Effect on channel system | |
| The disorder blocks the 1-dimensional 12-ring channel of cancrinite. | |
Simplest ordered end members
The color of each layer reflects the translation used to generate it from the first layer (see table above).
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| Polymorph CAN | |||||
| Cell Parameters: | hexagonal | P 63/m m c: (# 194) | |||
| a = 12.4940 Å | b = 12.4940 Å | c = 5.2540 Å | |||
| α = 90.000° | β = 90.000° | γ = 120.000° | |||
| Volume = | 710.3 Å3 | ||||
| Framework Density (FDSi): | 16.9 | ||||
| Ring sizes (# T-atoms): | 12 6 4 | ||
| Channel dimensionality: | Topological (pore opening > 6-ring): 1-dimensional | ||
| ABC-6 sequence: | AB sequence of ABC-6 layers | ||
| Maximum diameter of a sphere: | |||||||
| that can be included | 6.27 Å | ||||||
| that can diffuse along | a: 2.53 Å | b: 2.53 Å | c: 5.96 Å | ||||
| addional volume data | |||||||
| Composite Building Units: |
 | ||
can | ||
| In this space group and setting, the PerBUs are stacked along [001] |
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| Note: This polymorph corresponds to the ordered framework CAN | |
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| Polymorph SOD | |||||
| Cell Parameters: | cubic | I m -3 m: (# 229) | |||
| a = 8.9561 Å | b = 8.9561 Å | c = 8.9561 Å | |||
| α = 90.000° | β = 90.000° | γ = 90.000° | |||
| Volume = | 718.4 Å3 | ||||
| Framework Density (FDSi): | 16.7 | ||||
| Ring sizes (# T-atoms): | 6 4 | ||
| Channel dimensionality: | Topological (pore opening > 6-ring): 0-dimensional | ||
| ABC-6 sequence: | ABC sequence of ABC-6 layers | ||
| Maximum diameter of a sphere: | |||||||
| that can be included | 6.32 Å | ||||||
| that can diffuse along | a: 2.53 Å | b: 2.53 Å | c: 2.53 Å | ||||
| addional volume data | |||||||
| Composite Building Units: |
 | ||
sod | ||
| In this space group and setting, the PerBUs are stacked along [111] |
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| Note: This polymorph corresponds to the ordered framework SOD | |
Disorder Example
| The 12-ring channel of CAN is blocked by the SOD polymorph |