The magnetic structure of the antiferromagnetic phase of the pseudo-cubic perovskite BaLaCoIrO6 has been determined from time-of-flight powder neutron diffraction data collected at a temperature of 4 K. The Co(II) cations adopt a Type II collinear spin structure with an ordered moment of 2.8(2) µB per Co(II); the Ir(V) cations do not have a detectable ordered magnetic moment. Magnetic susceptibility measurements on the compounds Ba3CoIrxRu2-xO9 (0<x=2) resulted in the observation of weak ferromagnetism; the saturation magnetization decreased with increasing Ru content. Comparisons are made between BaLaCoIrO6 and the spin glass BaLaCoRuO6, and also between Ba3CoIr2O9 and antiferromagnetic Ba3CoRu2O9. The behaviour of the nominally non-magnetic Ir(V) cations is discussed and contrasted with that of diamagnetic Sb(V) in Ba3CoSb2O9 and Ba3CoIrSbO9. © 1995.
|Number of pages||7|
|Journal||Journal of Alloys and Compounds|
|Publication status||Published - 15 Feb 1995|
- Antiferromagnetic phase
- Magnetic structure
- Neutron diffraction