Journal article
Magnetic clusters in ilmenite-hematite solid solutions
We report the use of high-field 57Fe Mössbauer spectroscopy to resolve the magnetic ordering of ilmenite-hematite [xFeTiO3−(1−x)Fe2O3] solid solutions with x>0.5. We find that nanometer-sized hematite clusters exist within an ilmenite-like matrix. Although both phases are antiferromagnetically ordered, the hematite clusters show ferrimagnetic behavior due to superexchange coupling with Fe2+ in ilmenite.
For ilmenite-rich samples (x=0.95), the clusters are isolated and superparamagnetic. For more hematite-rich samples with x=0.80 and x=0.70, the clusters interact to form a cluster glass.
Language: | English |
---|---|
Year: | 2010 |
ISSN: | 1550235x , 10980121 and 01631829 |
Types: | Journal article |
DOI: | 10.1103/PhysRevB.81.224423 |
ORCIDs: | Frandsen, Cathrine |