Structure cristallines de deux variétés allotropiques de manganite de baryum. Nouvelle structure ABO3

Antoine Hardy (1)

1 Laboratoire de Chimie du Solide

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.

Mots clés: Crystal structure; Barium manganate; BaMnO3

Domaines: Matériaux

Antoine Hardy. Structure cristallines de deux variétés allotropiques de manganite de baryum. Nouvelle structure ABO3. Acta Crystallographica [1948-1967], 1962, 15, pp.179-181. ⟨10.1107/S0365110X6200047X⟩. ⟨hal-00124003⟩