Electronic structures of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>LiFePO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>FePO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>studied using resonant inelastic x-ray scattering

Hunt, Adrian; Ching, W. Y.; Chiang, Yet Ming; Moewes, A.

doi:10.1103/physrevb.73.205120

Cited by 24 publications

(16 citation statements)

References 35 publications

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“…Therefore, the behavior of f 1 is very similar in Fe 1.087 Te and in pure iron. This result confirms that the x-ray absorption for materials related to iron pnictides is qualitatively similar to Fe metal [37] but also very different from Fe ions in the Li x FePO 4 compound for the Li-battery cathodes [38], where multiplet calculations must be included [39]. In the bottom frame of Fig.…”

Section: Resultssupporting

confidence: 77%

Inelastic x-ray scattering from valence electrons near absorption edges of FeTe andTiSe2

et al. 2014

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We study resonant inelastic x-ray scattering (RIXS) peaks corresponding to low-energy particle-hole excited states of metallic FeTe and semimetallic TiSe 2 for photon incident energy tuned near the L 3 absorption edge of Fe and Ti, respectively. We show that the cross-section amplitudes are well described within a renormalization-group theory where the effect of the core electrons is captured by effective dielectric functions expressed in terms of the the atomic scattering parameters f 1 of Fe and Ti. This method can be used to extract the dynamical structure factor from experimental RIXS spectra in metallic systems.

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Section: Resultssupporting

confidence: 77%

Inelastic x-ray scattering from valence electrons near absorption edges of FeTe andTiSe2

et al. 2014

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“…Consistent with previous reports, a change in the Fe oxidation state (from 2+ to 3+) upon de-lithiation shifts the main absorption feature in the Fe L 3 edge from ~ 708 to ~ 710 eV. [96][97][98][99][100] Other previously reported spectral features were also satisfactorily reproduced. Excellent fits were obtained at all spatial positions, with a maximum residual of 0.8 % (averaged over all photon energies).…”

Section: Experimental Methodssupporting

confidence: 77%

Probing surface & transport phenomena in energy materials under operating conditions.

Chueh¹,

Marquez²,

McCarty³

et al. 2012

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Efficient conversion of energy between sunlight, chemical bonds, and electricity is crucial towards a closed-loop energy cycle. We have applied synchrotron-based Xray spectroscopy and microscopy techniques to investigate the conversion of electricity to and from chemical bonds in fuel cells, electrolyzers, and intercalation batteries. Using these techniques, we have tracked the motions from electrons, oxygen ions, and lithium ions at interfaces and in the bulk of electrochemically-active materials. New insights in gas-solid surface electrochemistry, and solid-solid phase transformation are guiding the development of better materials for a wide range of energy conversion and storage devices. 4 ACKNOWLEDGMENTS

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“…Besides the main components of battery electrode and electrolyte, a stringent requirement of a stable, electron‐insulating, but ion‐conductive (SEI) layer on the surface of corresponding electrodes is necessary to warrant a functional battery cell . Synchrotron based XAS, XES and RIXS have contributed to the understanding of various battery compounds, especially SEI and electrodes . Recently, Achkar et al reported bulk sensitive XAS through inverse partial fluorescence yield measurements, which has been quickly applied to study battery materials …”

Section: Soft X‐ray Absorption Non‐resonant and Resonant Emission Spmentioning

confidence: 99%

Recent Progress on Synchrotron‐Based In‐Situ Soft X‐ray Spectroscopy for Energy Materials

2014

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Soft X-ray spectroscopy (SXS) techniques such as photoelectron spectroscopy, soft X-ray absorption spectroscopy and X-ray emission spectroscopy are efficient and direct tools to probe electronic structures of materials. Traditionally, these surface sensitive soft X-ray techniques that detect electrons or photons require high vacuum to operate. Many recent in situ instrument developments of these techniques have overcome this vacuum barrier. One can now study many materials and model devices under near ambient, semi-realistic, and operando conditions. Further developments of integrating the realistic sample environments with efficient and high resolution detection methods, particularly at the high brightness synchrotron light sources, are making SXS an important tool for the energy research community. In this progress report, we briefly describe the basic concept of several SXS techniques and discuss recent development of SXS instruments. We then present several recent studies, mostly in situ SXS experiments, on energy materials and devices. Using these studies, we would like to highlight that the integration of SXS and in situ environments can provide in-depth insight of material's functionality and help researchers in new energy material developments. The remaining challenges and critical research directions are discussed at the end.

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Electronic structures ofLiFePO4andFePO4studied using resonant inelastic x-ray scattering

Cited by 24 publications

References 35 publications

Inelastic x-ray scattering from valence electrons near absorption edges of FeTe andTiSe2

Inelastic x-ray scattering from valence electrons near absorption edges of FeTe andTiSe2

Probing surface & transport phenomena in energy materials under operating conditions.

Recent Progress on Synchrotron‐Based In‐Situ Soft X‐ray Spectroscopy for Energy Materials

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