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
Famous quotes containing the words bond and/or parameters:
“It may comfort you to know that if your child reaches the age of eleven or twelve and you have a good bond or relationship, no matter how dramatic adolescence becomes, you children will probably turn out all right and want some form of connection to you in adulthood.”
—Charlotte Davis Kasl (20th century)
“What our children have to fear is not the cars on the highways of tomorrow but our own pleasure in calculating the most elegant parameters of their deaths.”
—J.G. (James Graham)