Perovskites Bi0.8La0.2FeO3 and Bi0.8La0.2Fe0.95Cr0.05O3: Crystal structure and magnetic and charge states of iron ions

被引：0
|
作者：
A. S. Sigov
V. S. Pokatilov
A. O. Makarova
V. V. Pokatilov
机构：
[1] Moscow State Technical University of Radio Engineering,
[2] Electronics,undefined
[3] and Automatics,undefined
来源：
Doklady Physics | 2014年 / 59卷
关键词：
Perovskite; Hyperfine Magnetic Field; Quadrupole Shift; Brillouin Function; BiFe;
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学科分类号：
摘要：
Perovskites of the Bi0.8La0.2Fe1 − xCrxO3 system (x = 0, 0.05) were investigated by Mössbauer spectroscopy in the temperature range of 298–800 K. The samples were fabricated by solid-state synthesis and had a rhombic structure. Iron ions in Bi0.8La0.2FeO3 and Bi0.8La0.2Fe0.95Cr0.05O3 are situated in trivalent states. The magnetic transition temperatures (the Néel temperatures TN) TN = 677.5 ± 2.5 K for Bi0.8La0.2FeO3 and TN = 647.6 ± 2.5 K for Bi0.8La0.2Fe0.95Cr0.05O3 are measured. The substitution of trivalent iron ions from trivalent chromium ions in the amount x = 0.05 in Bi0.8La0.2Fe0.95Cr0.05O3 perovskite decreases the hyperfine magnetic field at nuclei 57Fe in Fe+3-O-Cr+3 chains by 30 kOe.
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页码：267 / 270
页数：3
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