Hello Jamil Hassan

Access JCPDS cards are difficult, because it's a paid database. Instead, you can do something else. There is another way to identify the peaks without JCPDS card. You can download a CIF file from a database like Crystallography Open Database or Cambridge Crystallographic Data Centre. With a CIF file from your structure, you can use software like VESTA, and it can generate a calculated pattern and a hkl list.

The other question is "how can I know which CIF I pick?". You want to study a pure Cr(IV), isn't? Its structure is already determined, and maybe there are more than 1 possible structure for pure Chromium. Search in literature the XRD pattern for Chromium and see if it matches with the one you have. Then, you download the CIF correspondent to that structure.

I know it can be confusing, but let me know if you have any trouble with this.

Best regards,

Ricardo Tadeu

Hi Jamil Hassan,

Thank you for asking this question. I agreed with Ricardo Tadeu Maia. You need to know is it a cubic structure or others first? And then understand the space group of this element.

All the best.