Magnetic States of Iron Ions in Perovskite Bi0.75Sr0.25Fe0.95Cr0.05O3-yстатья
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Дата последнего поиска статьи во внешних источниках: 1 августа 2016 г.
Аннотация:57Fe hyperfine interactions are measured in cubic perovskite Bi0.75Sr0.25Fe0.95Cr0.05O3 – y by means of Mössbauer spectroscopy in the temperature range of 95–800 K. The temperature of the magnetic phase transition (Neél point TN) is measured TN = 633 (5) K. The experimental spectra at T < TN show a partially resolved magnetic hyperfine structure with broadened lines described satisfactorily by the superposition of four sextets. Hyperfine magnetic field Hn and isomeric δ and quadrupole ε shift values at room temperature show that all iron ions are in the trivalent state. Three sextets with the same isomer shifts (δ1 ≈ δ2 ≈
0.38 mm/s) correspond to iron ions in an octahedral oxygen environment; the fourth sextet (δ3 = 0.20 mm/s), to iron ions in the squarepyramidal oxygen environment.