Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures

Kmječ, Tomáš; Kohout, J.; Dopita, Milan; Veverka, M.; Kuriplach, J.

doi:10.3390/condmat4040086

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…Additionally, the magnetic moment per

was determined using the Curie–Weiss law, which can be used for superparamagnetic nanoparticles in the case of high temperature in the form of:

where C is the Curie constant, T is the thermodynamic temperature,

is the susceptibility and

is the Weiss constant. The Curie constant thus serves to calculate the magnetic moment per

via the next equation:

where

represents the vacuum permeability and

the Boltzmann constant [ 38 ]. The fitted Curie constant, Weiss constant and calculated values of magnetic moment per

are presented in Table 6 .…”

Section: Resultsmentioning

confidence: 99%

Microwave-Enhanced Crystalline Properties of Zinc Ferrite Nanoparticles

et al. 2022

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Two series of ZnFe2O4 mixed cubic spinel nanoparticles were prepared by a coprecipitation method, where a solution of Fe3+ and Zn2+ was alkalised by a solution of NaOH. While the first series was prepared by a careful mixing of the two solutions, the microwave radiation was used to enhance the reaction in the other series of samples. The effect of the microwave heating on the properties of the prepared particles is investigated. X-ray powder diffraction (XRD), 57Fe Mössbauer spectroscopy and magnetometry were employed to prove the cubic structure and superparamagnetic behavior of the samples. The particle size in the range of nanometers was investigated by a transmission electron microscopy (TEM), and the N2 adsorption measurements were used to determine the BET area of the samples. The stoichiometry and the chemical purity were proven by energy dispersive spectroscopy (EDS). Additionally, the inversion factor was determined using the low temperature Mössbauer spectra in the external magnetic field. The microwave heating had a significant effect on the mean coherent length. On the other hand, it had a lesser influence on the size and BET surface area of the prepared nanoparticles.

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“…Additionally, the magnetic moment per

was determined using the Curie–Weiss law, which can be used for superparamagnetic nanoparticles in the case of high temperature in the form of:

where C is the Curie constant, T is the thermodynamic temperature,

is the susceptibility and

is the Weiss constant. The Curie constant thus serves to calculate the magnetic moment per

via the next equation:

where

represents the vacuum permeability and

the Boltzmann constant [ 38 ]. The fitted Curie constant, Weiss constant and calculated values of magnetic moment per

are presented in Table 6 .…”

Section: Resultsmentioning

confidence: 99%

Microwave-Enhanced Crystalline Properties of Zinc Ferrite Nanoparticles

et al. 2022

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“…The latter can be viewed as a cousin technique of Compton scattering, involving γ-rays instead of hard X-rays, allowing the identification of defects (that are often attractive for positrons) and their chemical surroundings in materials [22,23]. DFT-based simulations in conjunction with Mössbauer spectroscopy, moreover, can be applied to study the deep connection between magnetism, electronic, and atomic structure in cathode materials [24] allowing the identification of the redox state of cathodes. DFT-based simulations are also able to provide precious information regarding the effect of the local atomic environment and structural deformations on the electrochemical redox potentials [17].…”

Section: Advanced Battery Characterisationmentioning

confidence: 99%

Study of Rechargeable Batteries Using Advanced Spectroscopic and Computational Techniques

2021

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Improving the efficiency and longevity of energy storage systems based on Li- and Na-ion rechargeable batteries presents a major challenge. The main problems are essentially capacity loss and limited cyclability. These effects are due to a hierarchy of factors spanning various length and time scales, interconnected in a complex manner. As a consequence, and in spite of several decades of research, a proper understanding of the ageing process has remained somewhat elusive. In recent years, however, combinations of advanced spectroscopy techniques and first-principles simulations have been applied with success to tackle this problem. In this Special Issue, we are pleased to present a selection of articles that, by precisely applying these methods, unravel key aspects of the reduction–oxidation reaction and intercalation processes. Furthermore, the approaches presented provide improvements to standard diagnostic and characterisation techniques, enabling the detection of possible Li-ion flow bottlenecks causing the degradation of capacity and cyclability.

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“…Shirley Shen's group proposed a MOF based on Fe called Matériaux de l' Institut Lavoisier 101 [MIL-101(Fe)] as a cathode material for Li-ion batteries, in 2015 [12]. Shin et al [12] found that the Fe 3+ /Fe 2+ redox pair is active in MIL-101(Fe), as is the case in the well-known olivine LiFePO 4 material [13][14][15][16]. However, reversibility of this MOF degraded rapidly with cycling, so that appropriate functionalization of MIL-101(Fe) will be needed to address this problem [12].…”

Section: Introductionmentioning

confidence: 99%