A Comparative High-Resolution Electron Microscope Study of Ag Clusters Produced by a Sputter-Gas Aggregation and Ion Cluster Beam Technique

Abstract

An overall comparison between the principal-axis orientations of the g-tensors and the second-order zero-field-splitting (ZFS) tensors for four Cr 3+ and four Fe 3+ centres reported on in our previous studies has been made. One direction of the principal axes of the g-tensor is nearly the same as one of those of the second-order ZFS tensor for Cr 3+ centres, but a similar direction does not exist for Fe 3+ centres. It is also found that one direction of the principal axes of the second-order ZFS tensors for Cr 3+ centres is similar to one of those for the Fe 3+ centres. It is suggested that Cr 6+ ions substituted for P 5+ in PO 4 tetrahedra play the role of positive monovalent charge compensators for both Cr 3+ and Fe 3+ , replaced at the sites Ti(1) and Ti(2). Possible charge-compensation models related to Cr 6+ ions for providing an explanation of the origins of the two different centres arising from the Cr 3+ and Fe 3+ at crystallographically equivalent Ti sites are also suggested.

Electrically conductive properties of Ag/Si composite nanoparticle assembled films prepared with a plasma–gas-condensation cluster source

“…anoparticles are one of the most active research topics because their physical and chemical properties are different from those of bulk solids. 1) Using a plasma-gas-condensation cluster beam deposition (PGCCD) apparatus, [2][3][4][5] we can obtain metal nanoparticles by setting targets [5][6][7][8] and alloy nanoparticles by setting two different metal targets face to face. 9,10) Recently, we have succeeded in producing composite nanoparticles consisting of two elements, for example, Fe/Si, 11,12) Co/Si, 13) and Fe/Al 14) core-shell nanoparticles, using a double-source PGCCD apparatus, and Co/CoO 15) core-shell and Sn/Si bimetallic nanoparticles, using a single-source PGCCD apparatus.…”

Possibility of Exciton Mediated Superconductivity in Nano-Sized Sn/Si Core–Shell Clusters: A Process Technology towards Heterogeneous Material in Nano-Scale

“…Several experimental techniques have been applied to prepare nano-sized clusters. [1][2] A plasma-gas-condensation cluster beam deposition (PGCCD) apparatus, [3][4][5][6] which is a combination of sputtering vaporization and inert gas condensation, is one of the promising candidates for this purpose. It is versatile to vaporize transition metals and refractive elements, and able to control the cluster size by adjusting the sputter yield, the gas pressure, and the volume of the cluster growth region.…”