Short-range nanoregions and nanosized defects in LiFeO $$_2$$ compound deduced from Mössbauer spectroscopy and Rietveld analysis

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research Pub Date : 2024-05-06 DOI:10.1557/s43578-024-01338-0

V. Panagopoulos, E. Devlin, Y. Sanakis, V. Psycharis, M. Pissas

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Abstract

We examined the crystal and magnetic properties of the polymorphic LiFeO$_2$ compound using Mössbauer spectra (MS), X-ray diffraction data (XRD), and magnetic measurements. X-ray diffraction analysis of $\alpha$-LiFeO$_2$ and $\beta '$-LiFeO$_2$ phases reveals that short-range ordering observed in the $\alpha$-LiFeO$_2$ phase is potentially linked to the $\beta '$-LiFeO$_2$ phase nanoregions. Low-temperature MS of the $\alpha$-LiFeO$_2$ phase reveal a complicated disordered magnetic state below 90 K. Rietveld analysis of the XRD data of the $\gamma$-LiFeO$_2$ phase reveals a defect microstructure. These defects produce a complicated distribution of the hyperfine magnetic field estimated from MS. While it is not possible to produce the $\beta '$-LiFeO$_2$ phase in pure form, extended annealing of the $\alpha$-LiFeO$_2$ phase at 400 $^\circ$C yields a nanocomposite material comprising nanoregions of both $\beta '$-LiFeO$_2$ and $\gamma$-LiFeO$_2$ phases.

Graphical abstract

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从莫斯鲍尔光谱和里特维尔德分析法推导出 LiFeO $$_2$$ 复合物中的短程纳米区域和纳米级缺陷

我们使用莫斯鲍尔光谱（MS）、X 射线衍射数据（XRD）和磁性测量方法研究了多晶态 LiFeO$_2$ 化合物的晶体和磁性。对（α）-LiFeO（_2）和（β）-LiFeO（_2）相的 X 射线衍射分析表明，在（α）-LiFeO（_2）相中观察到的短程有序化可能与（β）-LiFeO（_2）相纳米区域有关。对（α）-LiFeO（_2）相的 XRD 数据进行的里特维尔德分析揭示了一种有缺陷的微观结构。这些缺陷产生了由 MS 估算的超频磁场的复杂分布。虽然不可能生产出纯的（beta）-LiFeO（_2）相、α）-LiFeO（_2）相在400℃下的扩展退火产生了一种纳米复合材料，这种材料由（β）-LiFeO（_2）相和（gamma）-LiFeO（_2）相的纳米区域组成。图形摘要

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来源期刊

Journal of Materials Research 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.70%

发文量

362

审稿时长

2.8 months

期刊介绍： Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory