Crystal Lattice Dynamics of the Substitutional Solid Solutions in the Bi(Gd) - Fe - O and Bi(Nd) - Fe - O Systems
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.460
Crystal Lattice Dynamics of the Substitutional Solid Solutions in the Bi(Gd) - Fe - O and Bi(Nd) - Fe - O Systems Valery Sobol1, Barys Korzun2, Cheslav Fedorcov1, Olga Mazurenko3, Temirkhan Bizhigitov4, Sabit Tomaev4, Bibara Nushnimbaeva4, Sofia Egemberdieva4, Altynbek Nauryzbaev4 1
Belarusian State Pedagogical University, 18 Sovetskaya St., Minsk 220030, Belarus
2
The City University of New York, Borough of Manhattan Community College, 199 Chambers St., New York, NY 10007, U.S.A.
3
Belarusian Republican Foundation for Fundamental Research, 66 Nezavisimosti Ave., Minsk 220072, Belarus
4
Taraz State Pedagogical University, 62 Tole bi St., Taraz 080001, Kazakhstan
ABSTRACT
The substitutional solid solutions in the Bi(Gd) - Fe - O and Bi(Nd) - Fe - O systems of the Bi1-xGdxFeO3 and Bi1-xNdxFeO3 types with x up to 0.20 were synthesized by the solid-state reaction method and investigated using X-ray diffraction analysis and infrared reflective spectrometry in the wavelength range from 12.5 to 24 m. It was determined that the Bi1xGdxFeO3 and Bi1-xNdxFeO3 crystal structure is a distorted form of perovskite, R3c space group. Two extremums at 18.2 m (strong extremum) and 22.5 m (rather weak extremum) on the infrared reflection spectra of the Bi1-xGdxFeO3 and Bi1-xNdxFeO3 solid solutions were discovered. The extremum at 18.2 m corresponds to the Fe – O stretching vibrations and the extremum at 22.5 m corresponds to the O - Fe – O bending vibrations of the FeO6 groups. The growth of reflectivity of the Bi1-xGdxFeO3 and Bi1-xNdxFeO3 solid solutions in comparison with pure BiFeO3 and the displacement of the reflectivity band maximum into the side of the spectrum with longer wavelengths with the increase of the atomic part of the substitutive element x up to 0.20 were found.
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INTRODUCTION Bismuth ferrite BiFeO3 is a promising magnetoelectric material due to the coexistence of both ferroelectric and antiferromagnetic orders in this material at room temperature [1]. The observed switching of antiferromagnetic domain in the films of BiFeO3 by the external electric field indicates that there is a possibility of applying this material in novel electronic devices. It is desirable to transform the antiferromagnetic spin configuration of BiFeO3 into the ferromagnetic one by an action on the spiral modulated spin structure. Chemical doping can modify both the electric conductivity and the spiral spin structure to intensify the macroscopic properties. In particular, the use of rare-earth elements Gd and Nd for the substitution of Bi has been proposed [2, 3]. The effect of the substitution of Bi by Gd on the structural, magnetic, and dielectric properties was studied in [4, 5]. Electron spin resonance and magnetic prop
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