Characteristic chemical shifts of quasicrystalline Zn–Mg–Zr alloys studied by EELS and SXES

Koshiya, Shogo; Terauchi, Masami; Ohhashi, Satoshi; Tsai, An‐Pang

doi:10.1080/14786435.2013.765994

Cited by 4 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results suggest that the amount of valence charge of Al atoms in those quasicrystalline alloys is decreased, but that of approximant alloy is comparable with that of pure aluminium. The present result and those reported previously of chemical shift observed for Al-Kα and Zn-L emissions[4,5,8] are listed inTables 1 and 2, respectively. The results of reference materials of α-Al 2 O 3 and ZnO obtained at the same experimental conditions are also shown.…”

mentioning

confidence: 52%

“…The decreased charges were evaluated to be 1.2 and 1.1 ± 0.3 e -/atom for F-type and P-type quasicrystalline materials, respectively. The observed chemical shifts of all constituent atoms for quasicrystalline materials by EELS and SXES [4,5,8] were positive. It can be said that the electron charge at all atomic sites is decreased.…”

Section: Metal-almentioning

confidence: 80%

“…Chemical shift values of Zn-L emissions (eV) [5] Zn-Mg-Zr alloys F-type quasicrystal (F-QC) P-type quasicrystal (P-QC) Approximant crystal (AP) +3.0 ± 0.5 +2.7 ± 0.5 0 ± 0.5 Zinc oxide (ZnO) +3.6 ± 0.5 Figure 2 shows examples of charge density calculations and Bader analyses for aluminium sites in pure Al and α-Al 2 O 3 . Bader volume is shown with yellow colour region in each crystal structure.…”

Section: Resultsmentioning

confidence: 99%

“…Reported results on chemical shifts for Al-Si-Mn (amorphous, quasicrystalline and crystalline materials) [4], Al-Re-Si approximant (1/1-covalent, 1/1-metallic and 1/0-metallic materials) [8] and Zn-Mg-Zr (P-type and F-type quasicrystals and approximant crystals) [5], and the present experimental outcomes on Al-Pd-Cr-Fe alloys were used for evaluating the valence charge amount. Furthermore, experiments on Al-Pd-Cr-Fe intermetallic compounds were done as follows.…”

Section: Methodsmentioning

confidence: 99%

“…Characteristic chemical shifts of all constituent atoms of Al-Si-Mn and Zn-Mg-Zr quasicrystalline and related crystalline materials have been reported by EELS and soft-X-ray emission spectroscopy (SXES) experiments [4,5]. Only quasicrystalline materials showed apparent positive chemical shifts.…”

Section: Introductionmentioning

confidence: 92%

See 4 more Smart Citations

Amount of valence charge of Al- and Zn-based quasicrystals and related approximant crystals evaluated by chemical shift observations and Bader analysis

Koshiya

Terauchi

2015

Philosophical Magazine

Self Cite

View full text Add to dashboard Cite

The amounts of decreased charge at Al sites of Al-based (Al-Pd-Cr-Fe, Al-Si-Mn, and Al-Re-Si) and at Zn sites of Zn-based (Zn-Mg-Zr) quasicrystals and approximant crystals were estimated. The evaluation was done by comparisons between chemical shifts experimentally observed by soft-X-ray emission spectroscopy and the amount of valence charge obtained by Bader analysis for first principle calculations of reference materials (Al, α-Al 2 O 3 , Zn, and ZnO). Decreased charges at Al sites of Al-based quasicrystals and at Zn sites of Zn-based quasicrystals were evaluated to be 1.0-2.5 e -/atom and 1.1-1.2 e -/atom, respectively. A covalent bonding nature alloy of Al-Re-Si also showed a decrease in valence charge at Al sites.

show abstract

mentioning

confidence: 52%

Section: Metal-almentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

See 3 more Smart Citations

Amount of valence charge of Al- and Zn-based quasicrystals and related approximant crystals evaluated by chemical shift observations and Bader analysis

Koshiya

Terauchi

2015

Philosophical Magazine

Self Cite

View full text Add to dashboard Cite

show abstract

Deciphering Structural Origins of Highly Reversible Lithium Storage in High Entropy Oxides with In Situ Transmission Electron Microscopy

Ren

Lü

et al. 2023

Advanced Materials

View full text Add to dashboard Cite

Configurational entropy‐stabilized single‐phase high‐entropy oxides (HEOs) have been considered revolutionary electrode materials with both reversible lithium storage and high specific capacity that are difficult to fulfill simultaneously by conventional electrodes. However, precise understanding of lithium storage mechanisms in such HEOs remains controversial due to complex multi‐cationic oxide systems. Here, distinct reaction dynamics and structural evolutions in rocksalt‐type HEOs upon cycling are carefully studied by in situ transmission electron microscopy (TEM) including imaging, electron diffraction, and electron energy loss spectroscopy at atomic scale. The mechanisms of composition‐dependent conversion/alloying reaction kinetics along with spatiotemporal variations of valence states upon lithiation are revealed, characterized by disappearance of the original rocksalt phase. Unexpectedly, it is found from the first visualization evidence that the post‐lithiation polyphase state can be recovered to the original rocksalt‐structured HEOs via reversible and symmetrical delithiation reactions, which is unavailable for monometallic oxide systems. Rigorous electrochemical tests coupled with postmortem ex situ TEM and bulk‐level phase analyses further validate the crucial role of structural recovery capability in ensuring the reversible high‐capacity Li‐storage in HEOs. These findings can provide valuable guidelines to design compositionally engineer HEOs for almighty electrodes of next‐generation long‐life energy storage devices.

show abstract

Chemical shifts of metallic and non-metallic Al–Re–Si approximant crystals studied by EELS and SXES

Koshiya

Terauchi

Takagiwa

et al. 2014

Philosophical Magazine

View full text Add to dashboard Cite

Characteristic chemical shifts of quasicrystalline Zn–Mg–Zr alloys studied by EELS and SXES

Cited by 4 publications

References 24 publications

Amount of valence charge of Al- and Zn-based quasicrystals and related approximant crystals evaluated by chemical shift observations and Bader analysis

Amount of valence charge of Al- and Zn-based quasicrystals and related approximant crystals evaluated by chemical shift observations and Bader analysis

Deciphering Structural Origins of Highly Reversible Lithium Storage in High Entropy Oxides with In Situ Transmission Electron Microscopy

Chemical shifts of metallic and non-metallic Al–Re–Si approximant crystals studied by EELS and SXES

Contact Info

Product

Resources

About