Short-range nanoregions and nanosized defects in LiFeO$$_2$$ compound deduced from Mössbauer spectroscopy and Rietveld analysis
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Abstract
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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Research context
OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Advancements in Battery Materials · Iron oxide chemistry and applications
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References (48)
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