Measurements are reported of the diffuse scattering (in absolute units) from a single crystal of Fe0.93O, in a volume of reciprocal space and in equilibrium at 1173 K. These data were separated into the scattering due to ionic displacements and that due to the defect arrangement. The resulting local order parameters indicate clustering similar to that reported for quenched crystals. Some degree of order exists between clusters even at the high temperature, which is similar to that for the P″ phase. The clusters are distributed along 〈100〉 directions with a spacing of ∼ 2.5 a0 (where a0 is the lattice parameter). The cluster consists (on the average) of two incomplete corner-sharing vacancy tetrahedra aligned along 〈110〉 type directions, each containing an interstitial iron ion so that the ratio of vacancies to tetrahedral ions is 5.2.
- defect clusters
- diffuse scattering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics