if you are interested in short range order, X ray absorption spectroscopy can answer to your questions, above all for Y-O and Y-Y bond distance.

If you are not interested to the short range order, then X ray diffraction can provide what you need.

In literature you can find for Y2O3 yttria cubic bixbyite structure

space group = I a -3

* a = 10.6040 b = 10.6040 c = 10.6040

* alpha = 90.0 beta = 90.0 gamma = 90.0

Y-O = 0.227485nm

Y-Y = 0.352151nm

best regards

Sebastiano Cammelli

Thank you Cammelli, if the lattice constant is different from the one you have given (say, due to doping), i hope Y-O, Y-Y distances will also change accordingly. For example, in my case, a = 10.612 A. What might be the Y-O, Y-Y ? If you could further help me in this regards, please help me.

if you introduce other element, i.e. XXX, in your Y2O3 you have to pay attention to the atomic site occupied by the XXX element. If you want to measure the Y-Y Y-O, Y-XXX and XXX-O distances in your samples I recommend you to perform an EXAFS experiment which is a synchrotron based technique. You will get distances with a precision of 0.002nm. unfortunately I will change my job soon, otherwise I will suggest you to send me the samples... So you shall contact a beamline scientist and to fix a collaboration with some EXAFS expert. best

Thank you, it is my pleasure to have suggestions from you.