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

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2024年5月6日

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

摘要

We examined the crystal and magnetic properties of the polymorphic LiFeO $_2$ $_{2}$ compound using Mössbauer spectra (MS), X-ray diffraction data (XRD), and magnetic measurements. X-ray diffraction analysis of $\alpha$ $α$ -LiFeO $_2$ $_{2}$ and $\beta '$ $β^{'}$ -LiFeO $_2$ $_{2}$ phases reveals that short-range ordering observed in the $\alpha$ $α$ -LiFeO $_2$ $_{2}$ phase is potentially linked to the $\beta '$ $β^{'}$ -LiFeO $_2$ $_{2}$ phase nanoregions. Low-temperature MS of the $\alpha$ $α$ -LiFeO $_2$ $_{2}$ phase reveal a complicated disordered magnetic state below 90 K. Rietveld analysis of the XRD data of the $\gamma$ $γ$ -LiFeO $_2$ $_{2}$ 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 $\beta '$ $β^{'}$ -LiFeO $_2$ $_{2}$ phase in pure form, extended annealing of the $\alpha$ $α$ -LiFeO $_2$ $_{2}$ phase at 400 $^\circ$ $^{\circ}$ C yields a nanocomposite material comprising nanoregions of both $\beta '$ $β^{'}$ -LiFeO $_2$ $_{2}$ and $\gamma$ $γ$ -LiFeO $_2$ $_{2}$ phases.

Graphical abstract

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

摘要