Bond Valence Parameters
It is possible by bond valence calculations to estimate how great a contribution a given oxygen atom is making to the assumed valence of uranium. Bond valence calculations use parameters which are estimated after examining a large number of crystal structures of uranium oxides (and related uranium compounds), note that the oxidation states which this method provides are only a guide which assists in the understanding of a crystal structure.
The formula to use is
The sum of the s values is equal to the oxidation state of the metal centre.
For uranium binding to oxygen the constants RO and B are tabulated in the table below. For each oxidation state use the parameters from the table shown below.
| Oxidation state | RO | B |
|---|---|---|
| U(VI) | 2.08 Å | 0.35 |
| U(V) | 2.10 Å | 0.35 |
| U(IV) | 2.13 Å | 0.35 |
It is possible to do these calculations on paper or software.
Read more about this topic: Uranium Trioxide, Structure
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