MAGNETIC PROPERTIES OF AMORPHOUS AND LIQUID Ni-P ALLOYS AROUND 20 AT. % P

Wachtel, Ellen; Willmann, N.; Bahle, J.; Bakonyi, I.; Lovas, A.; Liebermann, H. H.

doi:10.1051/jphyscol:19888581

Cited by 6 publications

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References 1 publication

(6 reference statements)

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“…The high P content along with the broad feature in the PXRD pattern and unresponsiveness to an external magnet suggest the formation of an amorphous alloy of Ni-P. Note that amorphous Ni-P alloys with 20 wt % P are reported to lose their spontaneous magnetization; 24 likewise, there are no ferromagnetic crystalline nickel phosphides. 25 These results are qualitatively similar to those reported by Tracy and co-workers 18 for P:Ni ratios >9, but we see the transition from crystalline Ni to amorphous Ni x P y at considerably smaller ratios of P:Ni under our synthetic conditions.…”

Section: Resultsmentioning

confidence: 97%

Synthetic Levers Enabling Independent Control of Phase, Size, and Morphology in Nickel Phosphide Nanoparticles

2011

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Simultaneous control of phase, size, and morphology in nanoscale nickel phosphides is reported. Phase-pure samples of discrete nanoparticles of Ni12P5 and Ni2P in hollow and solid morphologies can be prepared in a range of sizes (10-32 nm) by tuning key interdependent synthetic levers (P:Ni precursor ratio, temperature, time, oleylamine quantity). Size and morphology are controlled by the P:Ni ratio in the synthesis of the precursor particles, with large, hollow particles formed at low P:Ni and small, solid particles formed at high P:Ni. The P:Ni ratio also impacts the phase at the crystallization temperature (300-350 °C), with metal-rich Ni12P5 generated at low P:Ni and Ni2P at high P:Ni. Moreover, the product phase formed can be decoupled from the initial precursor ratio by the addition of more "P" at the crystallization temperature. This enables formation of hollow particles (favored by low P:Ni) of Ni2P (favored by high P:Ni). Increasing temperature and time also favor formation of Ni2P, by generating more reactive P and providing sufficient time for conversion to the thermodynamic product. Finally, increasing oleylamine concentration allows Ni12P5 to be obtained under high P:Ni precursor ratios that favor solid particle formation. Oleylamine concentration also acts to "tune" the size of the voids in particles formed at low P:Ni ratios, enabling access to Ni12P5 particles with different void sizes. This approach enables an unprecedented level of control over phase and morphology of nickel phosphide nanoparticles, paving the way for systematic investigation of the impact of these parameters on hydrodesulfurization activities of nickel phosphides.

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Section: Resultsmentioning

confidence: 97%

Synthetic Levers Enabling Independent Control of Phase, Size, and Morphology in Nickel Phosphide Nanoparticles

2011

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Nickel Phosphide: The Effect of Phosphorus Content on the Activity and Stability toward Oxygen Evolution Reaction in Alkaline Medium

Poureshghi,

Seland,

Jensen

et al. 2024

ChemSusChem

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In this work, a systematic study of the effect of the metal to phosphorus ratio in Ni‐P nanoparticles on their catalytic activity with respect to the OER is reported. To this end, nickel phosphide nanoparticles are synthesized through two different synthesis routes, one involving in‐situ phosphidation and one involving ex‐situ phosphidation. In‐situ phosphidation is performed via two steps route in a one‐pot synthesis, in which Ni nanoparticles are formed at 220 ◦C, but not isolated, and then transformed to phase pure either Ni12P5 or Ni2P nanocrystallites. In the second synthesis method (ex‐situ phosphidation), nickel nanoparticles with an excess amount of trioctylphosphine (TOP) as a capping agent were synthesized and separated from the solution, then subsequently annealed in three different atmospheres, leading to the formation of three types of NixPy viz.[NixPy‐H2/Ar], [NixPy‐Ar], and [NixPy ‐air ], [NixPy ‐air ] nanoparticles showed the best electrocatalytic activity among the annealed nanoparticles in Ar and H2/Ar but lower than Ni12P5 nanoparticles. However, [NixPy ‐air ] showed very high stability in comparison with other synthesized nanoparticles. Moreover, the effect of the adventitious and spiked Fe in the electrolyte was studied on the electrocatalytic activity of all synthesized nanoparticles.

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Thermoelectric power of hydrogenated amorphous Pd/Si and Ni/P alloys

Szafrański¹

2002

Journal of Alloys and Compounds

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MAGNETIC PROPERTIES OF AMORPHOUS AND LIQUID Ni-P ALLOYS AROUND 20 AT. % P

Cited by 6 publications

References 1 publication

Synthetic Levers Enabling Independent Control of Phase, Size, and Morphology in Nickel Phosphide Nanoparticles

Synthetic Levers Enabling Independent Control of Phase, Size, and Morphology in Nickel Phosphide Nanoparticles

Nickel Phosphide: The Effect of Phosphorus Content on the Activity and Stability toward Oxygen Evolution Reaction in Alkaline Medium

Thermoelectric power of hydrogenated amorphous Pd/Si and Ni/P alloys

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