Mössbauer Study of Segnetomagnetic System (1-x)•BiFeO3 + x•PbFe2/3W1/3O3тезисы доклада

Дата последнего поиска статьи во внешних источниках: 29 марта 2018 г.

Работа с тезисами доклада


[1] Mössbauer study of segnetomagnetic system (1-x)•bifeo3 + x•pbfe2/3w1/3o3 / V. A. Andrianov, A. A. Bush, V. P. Gorkov et al. // International Conference on the Applications of the Mössbauer Effect. — Aising St.Petersburg, 2017. — P. 108–108. Ferrites BiFeO3 and PbFe2/3W1/3O3 belong to the class of multiferroics, in which ferroelectricity coexists with magnetic ordering. Bismuth ferrite BiFeO3 is ferroelectric with Tc=1120 K and has antiferromagnetic ordering of a cycloidal type with TN ≈ 640 K. PbFe2/3W1/3O3 is low temperature ferroelectric relaxor with TR ≈ 150-200 K and antiferromagnetic transition at TN=365 K. Both compounds have the perovskite crystal structure. Solid solution system of (1-x)•BiFeO3 + x•PbFe2/3W1/3O3 (0 ≤ x ≤ 1) was prepared and studied in order to extend the range of multiferroics materials and create novel compounds with promising properties. The samples were prepared by standard ceramic processing technology with different concentrations x. X-ray diffraction showed that the samples were the single phases with a perovskite structure. Information about magnetic Fe sublattice was obtained by Mössbauer effect at 57Fe nuclei. The temperatures of the antiferromagnetic phase transition TN were determined by temperature scaling of the intensity of the Mössbauer line at source velocity v=0. Mössbauer spectra were measured in paramagnetic range of the samples, at room temperature and at temperature T=80K. At high temperatures the Mössbauer spectra showed strongly broadened quadrupole doublets. In magnetic state Mössbauer spectra had the shape of Zeeman sextets with also broadened lines. Isomer shifts and values of hyperfine fields show that Fe atoms are in a high spin Fe3+ states according the data obtained for single phases BiFeO3 and PbFe2/3W1/3O3 [1, 2]. The analysis of the Mössbauer spectra is considered taking into account the nonequivalent crystallographic positions of Fe atoms due to the replacements of Fe and Bi atoms by the atoms of W and Pb.

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