How might one calculate A-O bond distance and B-O bond distance in ABO3 structure?

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Lawrence Margulies

x-ray or neutron diffraction.

Marcella Bini

You can collect the x-ray powder diffraction pattern and by the structural refinement you can find the bond lengths

not for oxygen. The scattering cross section is too small, which is why neutrons are used to get precise locations of oxygen in the unit cell (As well as site occupancy). Of course using both and refining them together is even better!