Journal ArticleDOI
Synthesis and magnetic properties of face-centered-cubic and hexagonal-close-packed ni nanoparticles through polyol process
TLDR
The Ni nanoparticles with fcc or hcp phases have been synthesized in tetraethylene glycol by using the modified polyol process as discussed by the authors, and the crystal structure has been controlled by changing the polyol/Ni mole ratio and reaction temperature.Abstract:
The Ni nanoparticles with fcc or hcp phases have been synthesized in tetraethylene glycol by using the modified polyol process. The crystal structure has been controlled by changing the polyol/Ni mole ratio and the reaction temperature. The saturation magnetization of the as-prepared particles depends on the relative volume fraction of the hcp phase. The x-ray diffraction and extended x-ray absorption fine structure studies suggest the formation of pure fcc and hcp Ni phases. The hcp Ni particles show nonmagnetic behavior and thermally stable below 673K.read more
Citations
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The polyol process: a unique method for easy access to metal nanoparticles with tailored sizes, shapes and compositions.
Fernand Fiévet,S. Ammar-Merah,Roberta Brayner,F. Chau,Marion Giraud,Fayna Mammeri,Jennifer Peron,Jean-Yves Piquemal,L. Sicard,Guillaume Viau +9 more
TL;DR: The scope of the polyol process has been extended to the preparation of more electropositive metals, such as post-transition metals and semi-metals, and the potential of this method is also clearly displayed for the prepared of alloys, intermetallics and core-shell nanostructures with a very large diversity of compositions and architectures.
Journal ArticleDOI
Preparation and magnetic properties of nickel nanoparticles via the thermal decomposition of nickel organometallic precursor in alkylamines
TL;DR: The results of magnetic characterization showed that the magnetic properties of the hexagonal close-packed (hcp) and face-centered cubic (fcc) nickel nanoparticles are quite different from those of the fcc and hcp, respectively.
Journal ArticleDOI
Formation of Ni3C Nanocrystals by Thermolysis of Nickel Acetylacetonate in Oleylamine: Characterization Using Hard X-ray Photoelectron Spectroscopy
Yuji Goto,Kota Taniguchi,Takahisa Omata,Shinya Otsuka-Yao-Matsuo,Naoki Ohashi,Shigenori Ueda,Hideki Yoshikawa,Yoshiyuki Yamashita,H. Oohashi,Keisuke Kobayashi +9 more
TL;DR: In this article, two cubic phases and a hexagonal phase were identified using X-ray diffraction and hard-X-ray photoelectron spectroscopy (HX-PES).
Journal ArticleDOI
Syntheses and Properties of Metal Nanomaterials with Novel Crystal Phases.
TL;DR: The research progress regarding the fine control of noble metal and non-noble metal nanomaterials with novel crystal phases and the challenges and perspectives in this emerging field are proposed.
Journal ArticleDOI
Chemical synthesis and characterization of hcp Ni nanoparticles
Vasileios Tzitzios,Georgia Basina,M. Gjoka,V. Alexandrakis,Vasilios Georgakilas,D. Niarchos,Nikos Boukos,Dimitrios Petridis +7 more
TL;DR: In this paper, hexagonal close-packed (hcp) Ni particles were prepared in the nanosize range (13-25nm) by reduction of Ni(NO3)2 in polyethylene glycol (PEG) with various molecular weights.
References
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Journal ArticleDOI
Hexagonal close packed nickel powder: synthesis, structural characterization and thermal behavior
TL;DR: In this paper, a hexagonal close packed nickel powder has been prepared upon reduction of Ni(II) with a K/B liquid alloy, which is stable at low temperature, undergoing a transition to a face centered cubic phase above 380°C.
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Progress and challenges in the theory and interpretation of X-ray spectra.
John J. Rehr,A. L. Ankudinov +1 more
TL;DR: In this paper, a review of the developments in this field by many groups leading up to the current state of the art is presented, with a summary of the key theoretical developments that are essential for achieving a quantitative agreement with experiment for X-ray absorption near-edge structure.
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Ferromagnetism in hexagonal-close-packed elements.
TL;DR: A self-consistent calculation of the band structure of paramagnetic hcp Ni revealed the highest known density of states at the Fermi level of any transition metal in any structure, providing strong evidence for ferromagnetism.
Journal ArticleDOI
Structure and magnetic properties of Ni films obtained by pulsed laser ablation deposition
J. Vergara,V. Madurga +1 more
TL;DR: In this paper, the magnetic moment of the annealed Ni samples increased, and their resistivity decreased with annealing at 440 °C, and the structural transformation from the hexagonal-close-packed to the stable face-centered-cubic (fcc) phase was completed, and magnetic moment, Curie temperature and electrical resistivity of the fcc Ni films were found similar to the ones observed in bulk Ni.
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