X-ray diffraction (XRD) patterns, electron probe microanalysis(EPMA), electron paramagnetic
resonance (EPR) powder spectra (9 and 34 GHz) and the magnetic susceptibility of BaTiO3 + 0.04
BaO + 0.01 V2O5 ceramics were studied to investigate the valence states of V ions and their solubility
in the BaTiO3 lattice. In samples sintered at 1400 °C in air, only about 0.1 mol% V is incorporated in
the BaTiO3 lattice being in V4+ and V5+ valence state, respectively. 95% of the nominal V dopant
content occurs in the secondary phase Ba3(V/Ti)2O8. All BaTiO3 samples investigated are in
tetragonal phase at room temperature. In the as-sintered samples V4+ is detected at temperatures
T < 20 K by its hyperfine structure (HFS) octet due to the nuclear spin 7/2 of 51V. Samples post annealed in H2/Ar atmosphere at 1200 °C exhibit a further HFS octet occurring at T > 25 K and
vanishing at T > 250 K, which is caused by V2+ ions. This spectrum is characterized by a simultaneous
HFS and fine structure splitting constituted by allowed and forbidden transitions. Both V4+ and V2+
ions are incorporated at Ti4+ sites of the BaTiO3 lattice
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:84996 |
| Date | 27 April 2023 |
| Creators | Böttcher, Rolf, Langhammer, H.T., Walther, T., Syrowatka, F., 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 | 2053-1591, 115210 |
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