Could XY crystal be a special case of X2YZ crystal?

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  • Thread starter qnach
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  • #1
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There are some types of crystals we call them XY type (i.e. NaCl) or X2YZ type? Could XY type be a special case of X2YZ type by assigning Y=Z?
 

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  • #2
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Yes.
you could see Si (X-type) as a special type of the GaAs (XY) type.
There are even order-disorder phase transitions where at high temperature the X-position is filled with 50% atom A and 50% atom B, and at low temperature X=100% A and Y=100% B. Beta-brass is an example. More complicated versions exist, and I am sure you can find XY <--> X2YZ
 

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