ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Uniform hematite particles with an average size of 400 Å were prepared for reducing the influence of the particle-size distribution on the measurement of the Morin temperature. A series of Mössbauer spectra at different temperatures have been recorded. The Morin transition occurs at 216 K for sample B coated with a surfactant-oleic acid, and it occurs at 192 K for uncoated sample A. The temperature intervals in the region of the spin flip are almost the same for both samples. These results show that aT m shift could arise from surface effects such as spin pinning directly induced by a surfactant, and that the distortion produces restriction not only on the top few layers, but also on the whole volume of the particle.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02060654
Permalink
