[sdpd] On Crystallography Open Database entries

["Dr. Chandan Mazumdar" <chandan...@cmp.saha.ernet.in>]

Hi,

   I was looking for the atomic parameters of Silicon (NBS standard), Ni2B
and RB2C2 (R = rare earth) in the COD at crystallography.net. For silicon,
it was showing 3 entries (Si 1.00), but in all the cases CIF files show
_chemical_formula_structural       'Si C'
_chemical_formula_sum              'Si'
Are they pure silicon, or silicon carbide? 

For Ni2B entry, the mentioned spacegroup is I -4 2 m, but in JCPDS data, I
found that the spacegroup is I4/mcm. Which one is right then?

Can anybody provide me the correct crystallographic data including atomic
positions for these three materials?

Thanking you in advance

Chandan Mazumdar


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