Trouble looking up values of critical temperature for mercury

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The discussion centers on the critical temperature values for mercury, specifically distinguishing between Hg (α) and Hg (β). Users confirm that these notations refer to different crystalline forms of solid mercury. The referenced source is the NPL website, which provides essential properties of superconducting elements. The need for clarity on these designations is emphasized, as they are crucial for understanding mercury's behavior in superconductivity.

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slimjim
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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
 
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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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