The phosphorus oxides with compositions between P409 and P40 s form a series of mixed crystals of the two molecules P409 and P4Os. The space group is R3c with unit-cell dimensions a = 10.05 A and a = 57.0 °. The 4 P atoms of the molecule are located at the corners of a trigonal pyramid and linked by 6 O on the edges; the remaining two or three O atoms are terminal oxygen atom.~ with respect to P.
The monoclinic crystals of this type of phosphorus(III,V) oxides are mixed crystals of the two molecules P408 and P407. These molecules differ from the usual P4010 molecule by two and three missing terminal oxygen atoms. The geometry of the P408 molecule is discussed in some detail and the structures of the molecular phosphorus oxides are compared.Von Heinz (1965) wurden P(III,V)-Oxide mit sttSchiometrischen Zusammensetzungen yon P409,0 bis P407, 7 dargestellt. Sie geh6ren zwei kristallinen Formen an, die verschiedene Debye-Aufnahmen geben. Die erste, das ~-Oxid, umfasst den Bereich P409,0-P4Os,1, wahr-end die zweite, das fl-Oxid, yon P408,0 bis P407,7 reicht. Die Gitterkonstanten sind far jede der beiden Formen unabhangig vonder stt~chiometrischen Zusammensetzung, wie mit Debye-Aufnahmen nachgewiesen wurde (Heinz, 1965), wfihrend sich die Dichten
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