Distinguish between

Face-centred and end-centred unit cells.



Face-centered



End- centered



An fcc refers to a crystal structure consisting of an atom at each cube corner and an atom in the center of each cube face.



An ecc refers to a crystal structure consisting of an atom at each cube corner and an atom in the center of any two opposite faces.







Examples: tungsten, chromium.



Examples: Gold, silver, copper, nickel, etc.




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