Undergrad Crystal Structure Database (Pb0.5Sn0.5)Te

[qnach]

I would like to find the crystal structure of (Pb0.5Sn0.5)Te
I was told it is similar to NaCl basically an XY crystal
I think it is called Space Group: 225
I would like to know the first, second, third ...layer of atoms closest to a X atom...and perhaps their distance...

I found
http://materials.springer.com/isp/crystallographic/docs/sd_0380725
But it had some access control...
Is there any free-access open database available?
Thanks.

 

[CapnGranite]

https://www.materialsproject.org/
The Materials Project

You type in the crystal structure and it generates data

 

[qnach]

https://www.materialsproject.org/
The Materials Project

You type in the crystal structure and it generates data

Thanks. I have registered and found NaCl.
Why there are two NaCl?
Furthermore, where can I find Wyckoff positions for this guy?

It does not seems to have (Pb0.5Sn0.5)Te?