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The packing efficiency of a face-centred...

The packing efficiency of a face-centred unit cell is 74%. What does it mean?

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The means 74% of the total volume within a face-centred cubic unit cell is occupied by the constituent particles of the unit cell.
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Knowledge Check

  • The edge length of a face-centred cubic unit cell is xsqrt2 . The distance between two nearest neighbours in this unit cell is-

    A
    `x/(2sqrt2)`
    B
    `x/2`
    C
    `xsqrt2`
    D
    x

  • The number of atoms in a face centred cubic unit cell is:

    A
    4
    B
    3
    C
    2
    D
    1

  • The correct order of the packing efficiency in different types of unit cells is-

    A
    fcc `lt` bcc `lt` simple cubic
    B
    fcc `gt` bcc `gt` simple cubic
    C
    fcc `lt` bcc `gt` simple cubic
    D
    bcc `lt` fcc `gt` simple cubic

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    Calculate packing fraction of face-centred cubic unit cell.

    Packing efficiency of body-centred cubic unit cell is _________ and that of face-centred cubic unit cell is _______.

    Calculate the packing efficiency of the two-dimensional square unit cells as given in the figure.

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