Abstract
The chemical and magnetic structures of the system have been determined using neutron diffraction for . The data yield a cation distribution () []. All the mixed ferrites show a noncollinear, Yafet-Kittel (YK) type of magnetic ordering. The YK angles increase with the zinc content and for a given composition decrease with increasing temperature. For , there is a transition from the YK to Néel type of ordering prior to the paramagnetic transition. The Néel region decreases with increasing ; thus, for , there is no Néel region, while Ni has the Néel type of ordering at all temperatures. The YK angle can be analytically related to , using the molecular-field theory. The angles predicted in this manner are consistent with a three-sub-lattice molecular-field analysis of the paramagnetic susceptibility data of Néel and Brochet.
- Received 22 October 1968
DOI:https://doi.org/10.1103/PhysRev.181.969
©1969 American Physical Society