Publikationsdatum:
2018
Beschreibung:
〈p〉Publication date: 1 January 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Physica B: Condensed Matter, Volume 552〈/p〉
〈p〉Author(s): N.А. Zhuk, V.P. Lutoev, V.A. Belyy, B.А. Makeev, D.S. Beznosikov, S.V. Nekipelov, M.V. Yermolina〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉The methods of EPR and NEXAFS spectroscopy were employed for the study of BiNb〈sub〉1-x〈/sub〉Fe〈sub〉x〈/sub〉O〈sub〉4-δ〈/sub〉 solid solutions of triclinic and orthorhombic modifications. The analysis of the NEXAFS Fe2p-spectra of iron oxides and the iron-containing solid solutions revealed that Fe atoms were mainly in an oxidation state of +3. In the EPR spectra of the BiNb〈sub〉1-x〈/sub〉Fe〈sub〉x〈/sub〉O〈sub〉4-δ〈/sub〉 samples of orthorhombic modification, a broad line with the center at g of 2.16–2.37 was registered along with the low-intensity signal with a g-factor of ∼4.3 observed on its low-field wing. EPR spectra of the triclinic structure samples exhibited a complex system of lines in the range of 80–300 mT. An intense complex line having features at g of 4.74–4.80, 4.04–4.10 and 3.76–3.80 was recognized in the low-field signal. The low-field wing of the line was complicated by a shoulder with g of 5.3 and by a line in the form of an absorption signal with g of 7.7–8.0. As a result of the modeling of EPR spectra, the spin-Hamiltonian parameters of Fe(III) in the structure of BiNb〈sub〉1-x〈/sub〉Fe〈sub〉x〈/sub〉O〈sub〉4-δ〈/sub〉 of triclinic modification were obtained.〈/p〉〈/div〉
〈/div〉
Print ISSN:
0921-4526
Digitale ISSN:
1873-2135
Thema:
Physik
