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On the Incorporation of Iron Into Hexagonal Barium Titanate: II. Magnetic Moment, Electron Paramagnetic Resonance (EPR) and Optical Transmission

On the Incorporation of Iron Into Hexagonal Barium Titanate: II. Magnetic Moment, Electron Paramagnetic Resonance (EPR) and Optical Transmission

H T Langhammer, T Walther, R Böttcher, S G Ebbinghaus

J Phys Condens Matter. 2020 May 14;32(38):385702.

PMID: 32408288

Abstract:

Systematic measurements of the magnetic moment in dependence on temperature and magnetic field of hexagonal 6H-BaTiO3 + 0.04 BaO + x/2 Fe2O3 (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 [Formula: see text], becomes stronger. At external magnetic fields smaller than 1 T a further, ferromagnetic interaction between Fe3+ ions is detected below 200 K. The interactions between Fe3+ 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 Fe3+-VO associates in the samples.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP12022718	Iron(II) titanate		12022-71-8	Price

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