利用莫斯鲍尔光谱法研究 SrCoxFe12-xO19 中 Co2+ 的优先取代位点

IF 2.6 4区 物理与天体物理 Q2 PHYSICS, APPLIED
Hengjian Hou, Zheng Li, Zeyi Lu, Jiyu Shen, Zhongjin Wu, Jiangbo Yang, Kaiyang Gao, Yanfang Xia
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引用次数: 0

摘要

本文采用溶胶-凝胶法制备了一系列 M 型六方 SrCoxFe12-xO19 (x=0、0.25、0.5)样品。X 射线衍射(XRD)显示,所制备的样品均为 p63/mmc 空间群的单六方晶体,且晶格参数 a、b 和 c 并未随 x 的增大而出现预期的变化趋势,这与 Co2+ 在 2a 和 4f2 位点的取代所引起的价态变化和晶格畸变有关。室温下的莫斯鲍尔光谱研究表明,当 x=0 时,Fe3+ 离子分布不均匀,偏向于 4f1、4f2 和 2a 位点;当 x=0.25 时,Co2+ 离子优先取代 2a 和 4f2 位点,并检测到 Fe2+ 的存在;当 x=0.5时,Co2+离子优先取代了4f1和2b位点,Fe2+的占有率降低,在12k位点出现了更大的占有率(RA),表明掺杂样品中的Fe3+更倾向于该位点。这项工作将为六方铁氧体家族中不同离子掺杂取代铁位点所引起的性质变化提供重要参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the preferential sites of Co2+ substitution in SrCoxFe12−xO19 using Mössbauer spectroscopy

In this paper, a series of M-type hexagonal SrCoxFe12xO19 (x=0, 0.25, 0.5) samples have been prepared by sol–gel method. X-ray diffraction (XRD) showed that the samples produced were all p63/mmc space groups of single hexagonal crystals, and the lattice parameters a, b and c did not show the expected trend with increasing x. This was related to the valence changes and lattice distortion caused by the substitution of Co2+ at the 2a and 4f2 sites. Room temperature Mössbauer spectra studies showed that when x=0, Fe3+ ions were not uniformly distributed, preferring the 4f1, 4f2 and 2a sites; when x=0.25, Co2+ ions preferentially displaced the 2a and 4f2 sites and the presence of Fe2+ was detected; when x=0.5, Co2+ ions preferentially displaced the 4f1 and 2b sites and the percentage of Fe2+ occupancy was reduced, with a greater occupancy (RA) occurring at the 12k site, indicating a preference of Fe3+ of the doped sample for this site. This work will provide an important reference for the variation of properties induced by different ion doping substitutions of the Fe sites in the hexagonal ferrite family.

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来源期刊
International Journal of Modern Physics B
International Journal of Modern Physics B 物理-物理:凝聚态物理
CiteScore
3.70
自引率
11.80%
发文量
417
审稿时长
3.1 months
期刊介绍: Launched in 1987, the International Journal of Modern Physics B covers the most important aspects and the latest developments in Condensed Matter Physics, Statistical Physics, as well as Atomic, Molecular and Optical Physics. A strong emphasis is placed on topics of current interest, such as cold atoms and molecules, new topological materials and phases, and novel low dimensional materials. One unique feature of this journal is its review section which contains articles with permanent research value besides the state-of-the-art research work in the relevant subject areas.
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