Microstrain and growth fault structures in electrodeposited nanocrystalline Ni and Ni–Fe alloys

Giallonardo, Jason D.; Avramovic-Cingara, G.; Palumbo, G.; Erb, U.

doi:10.1007/s10853-013-7469-4

Cited by 27 publications

(5 citation statements)

References 46 publications

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“…This growth observed by XRD concerned various crystallographic planes which did not affect the peak diffraction positions. Giallonardo et al 41 showed that the growth faults may be due to stacking faults which are not caused by deformation processes. Moreover, it is believed that these stacking faults could be related to the heterogeneity concluded from the TEM particle size distribution and H 2 -TPR profiles for D and CI samples.…”

Section: Resultsmentioning

confidence: 99%

Behavior of Coprecipitated NiAl₂O₄/Al₂O₃ Catalysts for Low-Temperature Methane Steam Reforming

et al. 2014

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The suitability of the nickel aluminate phase as an effective precursor for producing highly active and stable Ni/ alumina catalysts was investigated in the steam reforming of methane with a H 2 O/CH 4 ratio of 3 in the 450−650°C temperature range. Particularly, the effect of the preparation route, including dissolution followed by crystallization, coimpregnation, and coprecipitation, for obtaining either bulk or alumina-supported samples was analyzed. A special attention was paid to correlating the characteristics of the calcined catalytic precursors with a Ni content varying between 17 and 33 wt %, namely, textural properties, composition, nature, and relative abundance of the existing nickel phases (NiAl 2 O 4 and NiO), as well as reducibility, with the Ni crystallite size, dispersion, and metallic surface area obtained after a severe high-temperature reduction step (850°C). A high intrinsic activity was found for the coprecipitated catalysts. This route was also effective for increasing the available metallic surface area. The best reforming performance (with a methane conversion of 78−80% and yield of hydrogen close to 1.63 at 650°C and 38 400 cm 3 CH 4 g −1 h −1 ) was achieved by a reduced alumina-supported (17 wt % Ni)NiAl 2 O 4 catalyst and the bulk NiAl 2 O 4 catalysts prepared by coprecipitation.

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Section: Resultsmentioning

confidence: 99%

Behavior of Coprecipitated NiAl₂O₄/Al₂O₃ Catalysts for Low-Temperature Methane Steam Reforming

et al. 2014

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“…The obtained micro-strain values for the 0.25 at%Zr alloy were about 3.05 × 10 −3 , which value increased to 4.45 × 10 −3 with increasing Zr concentration. The increasing of lattice micro strain with increasing of Zrcontent due to the reduction of crystallite size (D) with increase in the dislocation density (δ) [24].…”

Section: Resultsmentioning

confidence: 99%

“…The shift toward shorter wavelengths shows the rise in the optical band gap. [24][25][26][27][28][29][30][31][32].…”

Section: Thermal Properties Of Fe 1-x -Zr X Alloymentioning

confidence: 99%

Structural, thermal and optical characteristics of Fe _1−X Zr _X alloy by using mechanical milling approach: influence of Zr⁴⁺ ion

Illayaraja Muthaiyaa,

Parameshwaranpillai,

Krishnamoorthy

et al. 2024

Mater. Res. Express

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By changing Zr concentrations, Fe1-x-Zrx (x= 0.25 & 1 at.%) alloys were successfully produced in an argon atmosphere using the mechanical alloying method. The produced Fe1-x-Zrx alloys were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersion X-ray analysis (EDAX), fourier transform infrared spectroscopy (FTIR), thermogravimetry analyzer (TG-DTA), ultraviolet-visible spectroscopy (UV–vis) absorption, and photoluminescence (PL) spectroscopy. According to XRD pattern analysis, the preparation alloys had a cubic crystalline structure and a complete solid solution formation. The average crystallite size for the 0.25at.% Zr concentration is found to be 7.79 nm and 11.8 nm for the 1 at.% Zr concentration. The TEM-dark field image confirms that the grain size is in the nanometric range (<100 nm). TEM-SAED spotty continuous ring pattern confirmed the complete solution formation is well correlated with the XRD results. The elemental distribution of the mechanically alloyed samples shows that Zr elements are homogeneously distributed in the Fe matrix. Bands at 3428 cm-1 in the FTIR spectrum have been linked to O–H stretching vibrations. CH2 and CH stretching vibrations were associated with peaks of about 2920 cm-1 and 2850 cm-1. The weight loss and gain changes were observed and represented in the TG-DST graph; we found that overall weight changes are + 10.7% (gain) at 1023oC for Fe 1-x-Zr x (x=0.25 at.%) alloy. The UV-visible absorbance edge revealed a blue shift when Zr was added, indicating alloy production. The energy band gap of materials was calculated using UV-vis, and it has been observed that the band gap reduces as Zr concentration increases. Zr was added to Fe1-x-Zrx alloy nanoparticles, resulting in 514 nm and 775 nm emission wavelengths. The higher PL emission peak was 514 nm at 0.25 at.% of Zr.

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“…In combination with grain size evolution, the main reason for the decrease of r.m.s. microstrain would be associated to the grain coalescence and coarsening [ 27 – 29 ].…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on Microstructural Stability of Pre-annealed Electrodeposited Nanocrystalline Nickel During Pack Rolling

Wang

et al. 2018

Nanoscale Res Lett

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Microstructural stability is an important issue for nanocrystalline materials to be practically used in many fields. The present work shows how microstructure evolves with rolling strain in pre-annealed electrodeposited nanocrystalline nickel containing an initial strong fiber texture, on the basis of X-ray diffraction line profile analysis as well as transmission electron microscopy observation. The influence of shear strain on microstructural stability of the metal/roll contact interface is compared with that of the metal/metal contact interface; the latter would be closer to deformation in plane strain compression. From the statistical microstructural information, together with experimentally observed microstructure of deformed grains after the final rolling pass, it seems fair to conclude that the microstructure of the metal/metal contact interface is more stable during pack rolling than that of the metal/roll interface.

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Microstrain and growth fault structures in electrodeposited nanocrystalline Ni and Ni–Fe alloys

Cited by 27 publications

References 46 publications

Behavior of Coprecipitated NiAl₂O₄/Al₂O₃ Catalysts for Low-Temperature Methane Steam Reforming

Behavior of Coprecipitated NiAl₂O₄/Al₂O₃ Catalysts for Low-Temperature Methane Steam Reforming

Structural, thermal and optical characteristics of Fe _1−X Zr _X alloy by using mechanical milling approach: influence of Zr⁴⁺ ion

Comparative Study on Microstructural Stability of Pre-annealed Electrodeposited Nanocrystalline Nickel During Pack Rolling

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Microstrain and growth fault structures in electrodeposited nanocrystalline Ni and Ni–Fe alloys

Cited by 27 publications

References 46 publications

Behavior of Coprecipitated NiAl2O4/Al2O3 Catalysts for Low-Temperature Methane Steam Reforming

Behavior of Coprecipitated NiAl2O4/Al2O3 Catalysts for Low-Temperature Methane Steam Reforming

Structural, thermal and optical characteristics of Fe 1−X Zr X alloy by using mechanical milling approach: influence of Zr4+ ion

Comparative Study on Microstructural Stability of Pre-annealed Electrodeposited Nanocrystalline Nickel During Pack Rolling

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Behavior of Coprecipitated NiAl₂O₄/Al₂O₃ Catalysts for Low-Temperature Methane Steam Reforming

Behavior of Coprecipitated NiAl₂O₄/Al₂O₃ Catalysts for Low-Temperature Methane Steam Reforming

Structural, thermal and optical characteristics of Fe _1−X Zr _X alloy by using mechanical milling approach: influence of Zr⁴⁺ ion