![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Praseodymium-oxygen_system.png/220px-Praseodymium-oxygen_system.png)
The Praseodymium-oxygen system is a system of oxides of praseodymium at different phases.
Value | Formula | Phase | x in PrOx | Average oxidation state of Pr |
---|---|---|---|---|
4 | Pr2O3 | θ | 1.5 | 3 |
7 | Pr7O12 | ι | 1.714 | 3.428 |
9 | Pr9O16 | ζ | 1.778 | 3.556 |
10 | Pr5O9 | ε | 1.8 | 3.6 |
11 | Pr11O20 | δ | 1.818 | 3.636 |
12 | Pr6O11 | β | 1.833 | 3.667 |
∞ | PrO2 | 2 | 4 |
This occurs due to the oxides being composed of octahedral Frenkel defects {Pr3+
2Pr4+
1.5O6}.Cite error: A <ref>
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