EXAFS Debye–Waller factors of La and Ni in LaNi5

Matsuura, Makoto; Asada, K.; Konno, K.; Sakurai, Masaki

doi:10.1016/j.jallcom.2004.09.026

Cited by 16 publications

(3 citation statements)

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“…Table 1 summarizes the curve-fitting results of the EXAFS spectra. Compared with bulk Co 3 O 4 , the DW factor of [16]. From the Table 1, we also note that the Co-O bond length of the nanowires is slightly shorter than that of the bulk Co 3 O 4 , indicative of a structural contraction for the nanowires, which demonstrates that the interaction between oxygen (or cobalt) and cobalt is stronger in these 1D Co 3 O 4 nanowires samples than in the bulk Co 3 O 4 .…”

Section: Synthesis and Characterization Of The Porous Co 3 O 4 Nanowiresmentioning

confidence: 84%

Porous cobalt oxide nanowires: Notable improved gas sensing performances

Pan

Guo

et al. 2012

Chin. Sci. Bull.

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The porous Co 3 O 4 nanowires have been successfully synthesized via modified template method. A possible growth mechanism governing the formation of such 1D nanowires is proposed. The as-prepared products have been characterized by X-ray Powder Diffraction (XRD), Extended X-ray Absorption Fine-structure (EXAFS), High-resolution Transmission Electron Microscopy (HRTEM) and N 2 adsorption/desorption analysis. Our systematic studies have revealed that the porous Co 3 O 4 nanowires show excellent gas sensing performances, which demonstrate the potential application of the 1D nanostructured Co 3 O 4 in the detection of the ethanol gas as a sensor material. The improved performances are owing to its large specific surface area and porous morphology. [4][5][6][7]. In particular, the thermal conversion of cobalt nitrate hexahydrate in silica templates to nanowires has proven to be promising. Thus, it is worthwhile to study the gas-sensing characteristics of one-dimensional (1D) Co 3 O 4 nanowires. The extended X-ray absorption fine-structure (EXAFS) technique is a powerful tool for probing the local atomic structures because of its element specificity and independence of the long-range order of materials [8]. The EXAFS spectra have provided many quantitative structural parameters such as interatomic distance, co-ordination number, and Debye-Waller factor [9]. EXAFS study is an indispensable method for investigate the local structure in the interior and at the surface, as well as bonding information of a variety of solid-state materials [10]. Herein, we report on a template synthesis leading to porous Co 3 O 4 nanowires using SBA-15 as hard templates. Moreover, the local structure in the interior and at the surface of the Co 3 O 4 nanowires and the bulk Co 3 O 4 were studied by EXAFS. The gas-sensing application of the as-prepared porous Co 3 O 4 nanowires was systematically investigated in detail.

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Section: Synthesis and Characterization Of The Porous Co 3 O 4 Nanowiresmentioning

confidence: 84%

Porous cobalt oxide nanowires: Notable improved gas sensing performances

Pan

Guo

et al. 2012

Chin. Sci. Bull.

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“…A single-shell model was fitted to the data in order to determine the amplitude, shape and phase-shift corrected values of the number of the nearest neighbors N, the interatomic distance R, and the mean squared relative displacement σ 2 of the effective interatomic distances. For Ag, Au and Pt, experimentally determined values of the amplitude reduction factor S o 2 = 0.81, 0.72, and 0.84 were chosen according to the fitting of the reference materials of pure Ag, Au and Pt, respectively, while for Ni a value S o 2 = 0.9 [21] was used. So 2 is an energy-independent many-body amplitude reduction factor which accounts for losses only within the central absorbing atom and is independent of the chemical nature and type of backscattering atoms [9].…”

Section: Methodsmentioning

confidence: 99%

Local constriction around minor elements in Al 86 Ni 7 X 1 Y 6 metallic glass (X: Ag, Au, Pt)

Liu

Schumacher

Bian

et al. 2015

Journal of Non-Crystalline Solids

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“…As many exhibit desirable electrochemical properties in LaNi 5 -type alloys, they have been used commercially as negative electrode materials for nickel-metal hydride (Ni MH x ) batteries [2][3][4]. Nevertheless, hydrogen absorption and desorption cycling has two main physical and irreversible consequences: defect generation and pulverization [5][6][7][8]. The application in batteries has been limited due to slow absorption/desorption kinetics in addition to a complicated activation procedure [9].…”

Section: Introductionmentioning

confidence: 99%