Merck
  • Home
  • Search Results
  • Super-stable ultrafine beta-tungsten nanocrystals with metastable phase and related magnetism.

Super-stable ultrafine beta-tungsten nanocrystals with metastable phase and related magnetism.

Nanoscale (2012-12-22)
J Xiao, P Liu, Y Liang, H B Li, G W Yang
ABSTRACT

Ultrafine tungsten nanocrystals (average size of 3 nm) with a metastable phase (beta-tungsten with A15 structure, β-W) have been prepared by laser ablation of tungsten in liquid nitrogen. The as-prepared metastable nanocrystals exhibited super-stablity, and can keep the same metastable structure over a period of 6 months at room temperature. This super-stability is attributed to the nanosized confinement effect of ultrafine nanocrystals. The magnetism measurements showed that the β-W nanocrystals have weak ferromagnetic properties at 2 K, which may arise from surface defects and unpaired electrons on the surface of the ultrafine nanocrystals. These findings provided useful information for the application of ultrafine β-W nanocrystals in microelectronics and spintronics.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
钨, wire, diam. 0.25 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, foil, thickness 0.05 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, wire, diam. 1.0 mm, 99.99% trace metals basis
Sigma-Aldrich
钨, wire, diam. 0.5 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, foil, thickness 0.25 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, foil, thickness 0.127 mm, ≥99.9% trace metals basis
Sigma-Aldrich
钨, foil, thickness 0.5 mm, ≥99.9% trace metals basis