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U parameter in hexagonal unitcells

  1. Aug 28, 2013 #1

    I have encountered in the papers that people present a, c and c/a as the parameters measured for any hexagonal unit cell. But what is u (angstrom) that sometimes appear among the parameters of a hexagonal unit cell?
  2. jcsd
  3. Aug 28, 2013 #2
    According to http://arxiv.org/abs/1308.1542, the u parameter represents the relative position of two hexagonal close-packed sublattices in the structure (for example, in a binary compound like ZnO).
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