Structure cristallines de deux variétés allotropiques de manganite de baryum. Nouvelle structure ABO3
Résumé
BaMnO3 at low temp. is hexagonal, BANiO3 type. The space group is C46v, the parameters are a 5.672 and c 4.71 A. There are two ABO3 units in a unit cell. BaMnO3 at high temp. belongs to the space group D46h with a 5.669 and c 9.38 A. The hexagonal unit cell has 4 ABO3 units. The lattice consists of layers of compn. BaO3 in a close-packed arrangement of atoms, like perovskite, but with a sequence ABAC.
Domaines
Matériaux
Origine : Accord explicite pour ce dépôt