Electrical and magnetic properties of CuCo and AuCo solid solutions

Zibold, G.; Korn, D.

doi:10.1016/0378-4363(81)90356-9

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…It is striking that the magnetization of 73–81 A m 2 kg Co –1 for the NPs at low temperature is reduced compared to the hcp Co volumetric value of 162.5 A m 2 kg Co –1 . For Co 20 Au 80 , this can be ascribed to at least partly paramagnetic sample in the SS as suggested by earlier investigations at low Co content in the Co–Au system . For Co 80 Au 20 CS and NCS structures, we expect fully metallic ε-Co according to the TEM, HRTEM, and XRD analyses.…”

Section: Resultssupporting

confidence: 65%

Formation of Co–Au Core–Shell Nanoparticles with Thin Gold Shells and Soft Magnetic ε-Cobalt Cores Ruled by Thermodynamics and Kinetics

et al. 2021

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Bimetallic core−shell nanoparticles (CSNPs), where a ferromagnetic core (e.g., Co) is surrounded by a noblemetal thin plasmonic shell (e.g., Au), are highly interesting for applications in biomedicine and catalysis. Chemical synthesis of such structures, however, requires multistep procedures and often suffers from impaired oxidation resistance of the core. Here, we utilized a one-step environmentally friendly laser ablation in liquid technique to fabricate colloidal Co−Au CSNPs with core−shell yields up to 78% in mass. An in-depth analysis of the CSNPs down to single-particle levels revealed the presence of a unique nested core−shell structure with a very thin gold-rich shell, a nanocrystalline ε-cobalt sublayer, and a nested gold-rich core. The generated Co−Au CSNPs feature soft magnetic properties, while all gold-rich phases (thin shells and nested cores) exhibit a face-centered cubic solid solution with substantial cobalt substitution. The experimental findings are backed by refined thermodynamic surface energy calculations, which more accurately predict the predominance of solid solution and core−shell phase structures in correlation with particle size and nominal composition. Based on the Co−Au bulk phase diagram and in conjunction with previously reported results on the Fe−Au core−shell system as well as Co− Pt controls, we deduce four general rules for core−shell formation in non-or partially miscible laser-generated bimetallic nanosystems.

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Section: Resultssupporting

confidence: 65%

Formation of Co–Au Core–Shell Nanoparticles with Thin Gold Shells and Soft Magnetic ε-Cobalt Cores Ruled by Thermodynamics and Kinetics

et al. 2021

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“…Published by AIP Publishing. 978-0-7354-4033-3/$30.00 methods [6][7][8]. In this work, the Au-Co alloy was obtained in bulk nanocrystalline form, which is suitable for further study without additional thermo mechanical action.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the structural-phase characteristics of a supersaturated ultrafine-grained Au-Co solid solution by diffractometry in hard synchrotron radiation

Tolmachev

Pilyugin

Анчаров

et al. 2020

SYNCHROTRON AND FREE ELECTRON LASER RADIATION: Generation and Application (SFR-2020)

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A synchrotron radiation study of immiscible Au-Co alloys obtained by consolidating a heterogeneous mixture of components and subsequent severe plastic deformation was performed. Namely, the estimates of the crystal lattice parameter, the average size of the coherent scattering regions and lattice strains in mechanically alloyed supersaturated solid solutions were made using obtained diffraction patterns and diffraction spectra. The effect of the temperature regime of deformation processing on the listed characteristics is shown, when the transition from cold deformation to cryogenic is carried out.

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Figs. 309 - 348

Zibold¹

Alloys and Compounds of D-Elements With Main Group Elements. Part 1

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Electrical and magnetic properties of CuCo and AuCo solid solutions

Cited by 6 publications

References 2 publications

Formation of Co–Au Core–Shell Nanoparticles with Thin Gold Shells and Soft Magnetic ε-Cobalt Cores Ruled by Thermodynamics and Kinetics

Formation of Co–Au Core–Shell Nanoparticles with Thin Gold Shells and Soft Magnetic ε-Cobalt Cores Ruled by Thermodynamics and Kinetics

Evaluation of the structural-phase characteristics of a supersaturated ultrafine-grained Au-Co solid solution by diffractometry in hard synchrotron radiation

Figs. 309 - 348

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