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Nickel

About: Nickel is a research topic. Over the lifetime, 79308 publications have been published within this topic receiving 1210058 citations. The topic is also known as: Ni & element 28.


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Journal ArticleDOI
TL;DR: In this paper, an experimental equation was derived to describe a typical dc polarization curve of a Ni-Yttria stabilized zirconia cermet (Ni-YSZ cermet) electrode in order to search for an adequate fabrication condition of a planar solid oxide fuel cell.
Abstract: Polarization characteristics were studied in nickel and yttria stabilized zirconia cermet (Ni-YSZ cermet) electrodes in order to search for an adequate fabrication condition of a planar solid oxide fuel cell. Several electrodes were prepared by the slurry coating method, and dc and ac polarization behaviors were investigated at 1273 K in H 2 -H 2 O atmosphere. An experimental equation was derived to describe a typical dc polarization curve of a Ni-YSZ cermet electrode. Effects of fabrication temperature, nickel content, and material powder were investigated in terms of deviation from this equation. Anodic overvoltage with a carefully prepared electrode was decreased to about 0.12 V at 1 A/cm 2

158 citations

Journal ArticleDOI
TL;DR: The existence of ferroelectricity in NiFe1.925Sm0.075O4 and NiFe 1.925Ho0.0.4 has been confirmed from the ferro electric loops, and the respective transition temperatures are 543 and 677 K.
Abstract: Sm- and Ho-substituted and pure nickel ferrite materials, namely, NiFe1.925Sm0.075O4, NiFe1.925Ho0.075O4, and NiFe2O4, have been synthesized by the solid-state chemical reaction, and their structural, magnetic, dc electrical conductivity, ferromagnetic, ferroelectric, and dielectric properties have been evaluated. Sm- and Ho-substituted nickel ferrites crystallize in the cubic inverse spinel phase with a very small amount of SmFeO3 and HoFeO3 as the additional phase, respectively. X-ray diffraction studies indicate rhombohedral distortion in NiFe1.925Sm0.075O4 and NiFe1.925Ho0.075O4 compounds. The existence of ferroelectricity in NiFe1.925Sm0.075O4 and NiFe1.925Ho0.075O4 has been confirmed from the ferroelectric loops, and the respective transition temperatures are 543 and 677 K. The respective magnetocapacitance values are −1.8% and −1.2%. Magnetoelectric coefficients observed at 500 Oe in the NiFe1.925Sm0.075O4 and NiFe1.925Ho0.075O4 compounds are 1.82 and 1.84 mV cm−1 Oe−1, respectively. A considerable...

158 citations

Journal ArticleDOI
TL;DR: The hydrogenation of ethylene, 1-butene, and 1,3-butadiene has been used as a probe reaction in an attempt to monitor any possible changes in catalytic behavior induced by supporting nickel on diff...
Abstract: The hydrogenation of ethylene, 1-butene, and 1,3-butadiene has been used as a probe reaction in an attempt to monitor any possible changes in catalytic behavior induced by supporting nickel on diff...

158 citations

Journal ArticleDOI
TL;DR: Analysis of different types of alloys used in orthodontics found the largest amount of nickel and chromium were leached out from the face-bows and the least amount from the arch wires, and Soldered stainless steel face- Bows seemed to be very susceptible to corrosion.

158 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20233,184
20226,229
20211,949
20202,693
20193,234
20183,107