The lattice parameter of nanocrystalline Ni as function of crystallite size

Sheng, J.; Rane, Gayatri K.; Welzel, U.; Mittemeijer, E. J.

doi:10.1016/j.physe.2011.01.029

Cited by 17 publications

(4 citation statements)

References 36 publications

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“…1 decreasing D 111 . The decrease in the lattice parameter with decreasing the mean grain size was also reported for n-Ni, n-Cu and n-Pd [18][19][20], where the compressive force from the tensile stress of GBs was supposed to the origin of the lattice construction. We reported that GD n-Au showed the plastic creep deformation at the stress above 30 MPa [16].…”

Section: Texture and Thermal Stability Of N-ausupporting

confidence: 59%

Mechanical Spectroscopy of Nanocrystalline Metals and Nanometer-Thick Films: Characteristic Properties Originated in Nanostructures

Tanimoto

2012

SSP

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Nanocrystalline (n-) Au shows a large internal friction accompanied with the modulus defects above ~200 K. After the creep test, the strong <111> preferred texture changed to rather random one but the mean grain size was unchanged.In situSTM observation indicated that the crystallites can independently move during the creep deformation. Quasi-two phase state composed of solid crystallites and anelastic/viscoelastic grain boundaries (GBs) is proposed to explain these characteristic mechanical properties ofn-Au. Further, GBs show the glass-transition-like change at around 200 K, anelastic/viscoelastic transition at ~30 MPa and dynamical state change above ~200 MPa. The high vacancy-type-defect concentration plays an important role on stabilization of the quasi-two phase state inn-Au.

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Section: Texture and Thermal Stability Of N-ausupporting

confidence: 59%

Mechanical Spectroscopy of Nanocrystalline Metals and Nanometer-Thick Films: Characteristic Properties Originated in Nanostructures

Tanimoto

2012

SSP

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“…47°, since this would correspond to a very large lattice contraction (on the order of Å/deg). (By comparison, Sheng et al found that Ni particles contract by approximately 0.01% down to 50 nm and then dilate back to approximately the bulk lattice constant at around 25 nm.) The peak at 2θ ≈ 47° in Figure is, however, consistent with the formation of Ni 3 P from Wang et al (PDF #04-015-7502) and other phosphides (see also Figures S10 and S12 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 97%

Effect of the Synthetic Method on the Properties of Ni-Based Hydrogen Oxidation Catalysts

Davydova

Manikandan

Dekel

et al. 2021

ACS Appl. Energy Mater.

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The latest progress in alkaline anion-exchange membranes has led to the expectation that less costly catalysts than those of the platinum-group metals may be used in anion-exchange membrane fuel cell devices. In this work, we compare structural properties and the catalytic activity for the hydrogen-oxidation reaction (HOR) for carbon-supported nanoparticles of Ni, Ni 3 Co, Ni 3 Cu, and Ni 3 Fe, synthesized by chemical and solvothermal reduction of metal precursors. The catalysts are well dispersed on the carbon support, with particle diameter in the order of 10 nm, and covered by a layer of oxides and hydroxides. The activity for the HOR was assessed by voltammetry in hydrogen-saturated aqueous solutions of 0.1 mol dm –1 KOH. A substantial activation by potential cycling of the pristine catalysts synthesized by solvothermal reduction is necessary before these become active for the HOR; in situ Raman spectroscopy shows that after activation the surface of the Ni/C, Ni 3 Fe, and Ni 3 Co catalysts is fully reduced at 0 V, whereas the surface of the Ni 3 Cu catalyst is not. The activation procedure had a smaller but negative impact on the catalysts synthesized by chemical reduction. After activation, the exchange-current densities normalized with respect to the ECSA (electrochemically active surface area) were approximately independent of composition but relatively high compared to catalysts of larger particle diameter.

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“…Such a lattice expansion has previously been reported for different nanomaterials. 30,31 We extracted an average crystallite size of 19.7 (6 0.2) nm from analysis of the x-ray linewidth broadening of the starting material (Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

The effect of crystallite size and stress condition on the equation of state of nanocrystalline MgO

Marquardt

Speziale

Marquardt

et al. 2011

Journal of Applied Physics

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We performed high-pressure synchrotron x-ray diffraction experiments on nanocrystalline (nc-) MgO compressed both under quasi-hydrostatic and non-hydrostatic conditions in a diamond-anvil cell. Data obtained under hydrostatic conditions show that nc-MgO (average crystallite size of 20 nm) is 8-9% more compressible than "bulk" MgO. Analysis of our results collected under non-hydrostatic conditions yields a bulk modulus that is about 27% larger than the one derived from the quasi-hydrostatic compression experiments. Thus, the apparent bulk modulus strongly depends on the experimental stress conditions.

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The lattice parameter of nanocrystalline Ni as function of crystallite size

Cited by 17 publications

References 36 publications

Mechanical Spectroscopy of Nanocrystalline Metals and Nanometer-Thick Films: Characteristic Properties Originated in Nanostructures

Mechanical Spectroscopy of Nanocrystalline Metals and Nanometer-Thick Films: Characteristic Properties Originated in Nanostructures

Effect of the Synthetic Method on the Properties of Ni-Based Hydrogen Oxidation Catalysts

The effect of crystallite size and stress condition on the equation of state of nanocrystalline MgO

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