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Trouble looking up values of critical temperature for mercury

  1. Feb 19, 2013 #1
    I find values for the critical temperature of mercury, but two values are given;

    one for Hg (α) and one for Hg (β).


    Does anyone know what the alpha and beta denotes?


    Here is the page I am referring to (under section titled "Properties of superconducting elements"):

    http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_4.html
     
  2. jcsd
  3. Feb 19, 2013 #2

    haruspex

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    Since this will be solid mercury, it could be two different crystalline forms, but I can't find any reference to back this up.
     
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