Citation: Tuenge, R.T.; Eyring, L. (1979). On the structure of the intermediate phases in the praseodymium oxide system. Journal of Solid State Chemistry, 29, pp. 165-179.
Formula: O9 Pr5
Chemical name: Pr5 O9
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: O72 Pr40 (O9 Pr5)
Multiplicity: 1
Coordination sequences: