Strontium ferrite SrFeO3-δ (2.50 ≤ 3-6 ≤ 2.87) studied by Raman and Mossbauer spectroscopy

被引：12
作者：
Barkalov, O. I. [1 ]
Zaitsev, S. V. [1 ]
Sedykh, V. D. [1 ]
机构：
[1] Russian Acad Sci, Osipyan Inst Solid State Phys, 2 Acad Ossipyan str, Chernogolovka 142432, Russia
来源：
SOLID STATE COMMUNICATIONS | 2022年 / 354卷
关键词：
Strontium ferrite; Browmillerite; Raman spectroscopy; Mossbauer spectroscopy; DEFECTS; CRYSTAL; SPECTRA;
D O I：
10.1016/j.ssc.2022.114912
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Crystal structure, short range order, lattice dynamics and valence state of polycrystalline single-phase strontium ferrites SrFeO3-delta (with 3-6 = 2.87 divided by 2.5) were studied by Raman and Mossbauer spectroscopy at normal conditions. Valence states of Fe ions and their fractions were determined from Mossbauer spectroscopy and concentrations of oxygen in all phases were estimated. For all studied SrFeO3-delta phases only five (or less) bands were observed above 200 cm(-1) in spite of numerous Raman active phonon modes predicted by a factor group analysis. For the antiferromagnetic Brownmillerite phase (3-delta = 2.5), a broad band observed at -1350-1400 cm(-1), was attributed to the two-magnon scattering. This band was found also for the SrFeO3-delta samples with 3-6 = 2.87 divided by 2.725 which are in paramagnetic state at room temperature. This fact indicates an existence of the unusual magnetic correlations in all SrFeO3-delta perovskites.
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页数：6
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