a=5.7   c=13.367 (hexagonal setup)

La  and Sr substitute each other at  0,0,0.25

and Co and Fe do the same at 0,0,0

O has been deteremined at 0.5202,0,0.25

The space group is R-3c, i.e. 167 

Hi Basker,

In addition to the previous answer, I think you can find those parameters from  ICSD website (for free) from googles or other and also you have to know first which the JCPDF which is matched to your sample (spinel phase). I hope this will be useful.

See similar materials like LaCoO3, LaFeO3 for this.