The Structure of Crystalline Solids - AX-Type Crystal Structures

6 important questions on The Structure of Crystalline Solids - AX-Type Crystal Structures

What are examples of AX-type crystal structures?

NaCl, CsCl, ZnS, ZnTe and SiC

How can you describe the crystal structure of NaCl?

Both anion and cation have a coordination number of 6, of which you can conclude that the cation-anion ratio is between 0.414 and 0.732.
The structure can be described as two interpenetrating FCC crystal structured.

What ceramic materials have the same structure as NaCl?

MgO, MnS, LiF, FeO
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How can you describe the structure of CsCl?

The anions form a simple cubic crystal structure with the cation in the center. The coordination number for the cation and anion is 8.
The structure can be described as two interpenetrating SC crystal structures.

How can you describe the structure of zinc blend?

These are again two interpenetrating FCC crystal structures. They fill each others internal tetrahedral spaces.

What are examples of zinc blend or equal structure?

ZnS, ZnTe and SiC

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