X-ray-absorption studies of zirconia polymorphs. I. Characteristic local structures

Li, Ping; Chen, I‐Wei; Penner‐Hahn, James E.

doi:10.1103/physrevb.48.10063

Cited by 322 publications

(348 citation statements)

References 28 publications

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“…25,[32][33][34] Indeed, this localized distortion tendency is conrmed in the present expansion study, since a C (and r V ) for PZCO is found to be very similar to that for cubic ZrO 2 , suggesting that vacancies are associated with Zr cations as opposed to adopting a random distribution with an expected a C (and r V ) between that for CeO 2 and ZrO 2 . This results in signicantly larger lattice distortions and oxygen displacements towards the vacancy near Zr (shown in Fig.…”

Section: 29-31mentioning

confidence: 76%

Reducing the chemical expansion coefficient in ceria by addition of zirconia

Bishop

Marrocchelli

Fang

et al. 2013

Energy Environ. Sci.

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Section: 29-31mentioning

confidence: 76%

Reducing the chemical expansion coefficient in ceria by addition of zirconia

Bishop

Marrocchelli

Fang

et al. 2013

Energy Environ. Sci.

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“…XANES spectra for two bulk standards plus c-and a-Co NPs are shown in Figure 10. The sensitivity of the XANES technique to valence state, crystallographic phase, multiple scattering effects (and more) makes for an effective means of "fingerprinting" the crystallographic phase of a material under investigation [45,64]. The prominent features of the bulk HCP Co and c-Co NP spectra in Figure 10 result from multiple scattering resonances of the 1s photoelectron [20].…”

Section: Resultsmentioning

confidence: 99%

Ion Beam Formation and Modification of Cobalt Nanoparticles

Sprouster

Ridgway

2012

Applied Sciences

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This article reviews the size-dependent structural properties of ion beam synthesized Co nanoparticles (NPs) and the influence of ion irradiation on the size, shape, phase and structure. The evolution of the aforementioned properties were determined using complementary laboratory-and advanced synchrotron-based techniques, including cross-sectional transmission electron microscopy, small-angle X-ray scattering and X-ray absorption spectroscopy. Combining such techniques reveals a rich array of transformations particular to Co NPs. This methodology highlights the effectiveness of ion implantation and ion irradiation procedures as a means of fine tuning NP properties to best suit specific technological applications. Furthermore, our results facilitate a better understanding and aid in identifying the underlying physics particular to this potentially technologically important class of nanomaterials.

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“…The XANES spectra obtained from Zr-AC samples are similar to each other and to that of the Zr-dinitrate, which indicates that the dodecahedral arrangement of the O atoms around Zr did not change significantly during the impregnating of AC. Only at high As loading is the maximum slightly broader, indicat- ing some influence of As oxoanions on the Zr arrangement, which may be interpreted in terms of a reduced symmetry [24]. None of the spectra contain a shoulder shape in the absorption edge, ruling out tetrahedral coordination.…”

Section: Zr K-edge Xasmentioning

confidence: 99%

Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon

Schmidt

Власова

Zuzaan

et al. 2008

Journal of Colloid and Interface Science

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Arsenate [As(V)] and arsenite [As(III)] sorption at the solid-water interface of activated carbon impregnated with zirconyl nitrate (Zr-AC) was investigated using X-ray absorption spectroscopy (XAS) and surface complexation modeling. The XAS data at the Zr K-edge suggest that the structure of the zirconyl nitrate coating is built from chains of edge-sharing ZrO 8 trigonal dodecahedra bound to each other through two double hydroxyl bridges. The 8-fold coordination of each Zr atom is completed by four O atoms, which share a bit less than the two theoretically possible bidentate nitrate groups. On impregnation, two of the O atoms may lose their nitrate group and be transformed to hydroxyl groups ready for binding to carboxylic or phenolic ligands at the AC surface. As K-edge XANES results showed the presence of only As(V) on adsorption regardless of the initial As oxidation state. Oxidation to As(V) is probably mediated by available carbon species on the AC surface as found by batch titration. Zr K-edge EXAFS data indicate that arsenate tetrahedra form monodentate mononuclear surface complexes with free hydroxyl groups of zirconyl dodecahedra, whereby each bidentate nitrate group is exchanged by up to two arsenate groups. The inner-sphere arsenate binding to the Zr-AC surface sites constrained with the spectroscopic results was used in the formulation of a surface complexation model to successfully describe the adsorption behavior of arsenate in the pH range between 4 and 12. The results suggest therefore that Zr-AC is an effective adsorbent for arsenic removal due to its high surface area and the presence of high affinity surface hydroxyl groups.

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X-ray-absorption studies of zirconia polymorphs. I. Characteristic local structures

Cited by 322 publications

References 28 publications

Reducing the chemical expansion coefficient in ceria by addition of zirconia

Reducing the chemical expansion coefficient in ceria by addition of zirconia

Ion Beam Formation and Modification of Cobalt Nanoparticles

Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon

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