[QE-users] I need a suggestion

[Stefano de Gironcoli]

google-ing  Francium wikipedia...

Bulk francium has never been viewed. Because of the general appearance 
of the other elements in its periodic table column, it is assumed that 
francium would appear as a highly reactive metal, if enough could be 
collected together to be viewed as a bulk solid or liquid. Obtaining 
such a sample is highly improbable, since the extreme heat of decay 
caused by its short half-life would immediately vaporize any viewable 
quantity of the element.

however it also says  (i dont know on the basis of what) : Density (near 
r.t.)    2.8–3.0 g/cm3 (extrapolated)[1]


stefano

On 21/03/19 18:44, yasmin kani wrote:
> I am searching for Francium lattice constant for scf calculation and i 
> could not find  it. Then I assumed Francium as a body centred cubic 
> and calculated its lattice constant as 5.58875 Angstrom. Is it right ?
>
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