Indoors BiFeO3 has r3c st and with doping it goes to orthorhombic. But the exact orthorhombic structure group is not clear.which is correct r3c to pbnm or r3c to c222. How to check it appropriately.
Dear Alaka,
Whenever you dope any element on a site of a system, it creates some type of structure distortion, either in the lattice parameters or in atomic coordinates. Just refine the lattice parameter and atomic coordinates by the XRD pattern of both system, you can get appropriate structure. As per your question how to choose c222 or Pbnm, always choose higher symmetry space group. As Any structure can be refined by the space group P1 as it has lower symmetry than others. So if Pbnm has higher symmetry than c222, choose Pbnm.
Thank you.
You must refine XRD data for both samples to evaluate whether doping changed the crystal symmetry.
You can download any free refinement tool from web for this purpose.
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