NDLI: Effects of tetrahedral Fe$^{2+}$ on the structural, magnetic and electronic properties of solution-based titanomagnetite thin films

Content Provider	Springer Nature Link
Author	Kim, Chul Sung Kim, Kwang Joo Koh, Tae Young Lee, Young Bae
Copyright Year	2014
Abstract	Polycrystalline titanomagnetite (Ti$_{ x }$Fe$_{3−x }$O$_{4}$) thin films prepared by using a sol-gel process exhibited a phase-pure spinel $$\left( {Fd\bar 3m} \right)$$ structure for Ti compositions up to x = 0.6. An X-ray photoelectron spectroscopy (XPS) investigation disclosed an increase of the Fe$^{2+}$ concentration with increasing x, indicating a reduction in ionic valence, Fe$^{3+}$ → Fe$^{2+}$, induced by Ti$^{4+}$ occupation of the cationic sublattice. Analyses on XPS and X-ray diffraction spectra of the Ti$_{ x }$Fe$_{3−x }$O$_{4}$ samples suggest that the Fe$^{2+}$ ions prefer the tetrahedral sites while the Ti$^{4+}$ ions prefer the octahedral sites of the sublattice. Magnetic hysteresis measurements on the Ti$_{ x }$Fe$_{3−x }$O$_{4}$ films revealed significant loss of the saturation magnetization (M$_{ s }$) with increasing x: M$_{ s }$ is reduced to 50% that of Fe$_{3}$O$_{4}$ for x = 0.10 and to 10% for x = 0.60. The big loss of M$_{ s }$ caused by small Ti doping suggests a significant disruption of the inter-site Fe$^{3+}$-Fe$^{3+}$ super-exchange interaction in thin-film titanomagnetites.
Starting Page	93
Ending Page	97
Page Count	5
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	64
Issue Number	1
e-ISSN	19768524
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-01-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnetization Ionic valence Theoretical, Mathematical and Computational Physics Titanomagnetite Spinel Physics Particle and Nuclear Physics Thin film
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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