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  • 23-11-2014 10:26pm
    #1
    LauraaWhelann
    Registered Users, Registered Users 2 Posts: 116 ✭✭


    can someone provide a worked example of the answer to this question?

    If the nearest neighbour distance is 2 angstrom then calculate the volumes of the unit cells in hcp and sc structures.

    could someone explain it with real basic language?

    I'm really lost. Thanks!


Comments

  • #2
    etoughguy
    Closed Accounts Posts: 344 ✭✭etoughguy


    Googled hcp and the first link iit dot edu was a pdf giving useful info on this
    sorry I am a new user and cant paste in URLs directly


  • #3
    citrus burst
    Registered Users, Registered Users 2 Posts: 147 ✭✭citrus burst


    Simple cubed is fairly simple and you should be able to work it out yourself.

    HCP is a bit more tough but there is a formula for calculating the volume of the cell. In that formula a is the distance between the two nearest neighbors while c is the height of the cell. There is a formula relating the length of a wrt the length of c.


  • #4
    IntotheWest100
    Closed Accounts Posts: 24 ✭IntotheWest100


    V=a^3 (standard volume formula). Without going to much into it-will let you work it, find the number of atoms for the simple cell (sc) structure and the same for the body centered cubic structure, (hint corner/ faces). The reason I told you look at the atoms as having a look at the structure you can figure out the length. Once you know that you can find the length then cube the area. I may have something wrong here as its been a while since done this but thats the gist!


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