Systematic measurements of the magnetic moment in dependence on temperature and
magnetic field of hexagonal 6H-BaTiO3 + 0.04 BaO + x/2 Fe 2 O 3 (0.005 x 0.05)
ceramics were performed to study the influence of Fe ions on the magnetic properties. While
the samples show Curie–Weiss paramagnetism for Fe concentrations 1.0 mol%,
antiferromagnetic interactions become manifest for 2.0 and 5.0 mol% iron. With increasing Fe
content the antiferromagnetic interaction, which is assumed to be caused by a superexchange
mechanism Fe 3+
Ti(1) − O 2−
O(2) − Fe3+
Ti(2) , becomes stronger. At external magnetic fields smaller
than 1 T a further, ferromagnetic interaction between Fe 3+ ions is detected below 200 K. The
interactions between Fe 3+ ions in the samples with 2.0 and 5.0 mol% iron are also manifest in
the EPR spectra by numerous lines with low intensity. Q-band EPR investigations of 5.0 mol%
Fe doped single crystals confirm the existence of only one type of Fe 3+ –V O associates in the
samples.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:85018 |
| Date | 27 April 2023 |
| Creators | Langhammer, H.T., Walther, T., Böttcher, Rolf, Ebbinghaus, S.G. |
| Publisher | IOP Publishing |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 1361-648X, 385752 |
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