| Project/Area Number |
10640375
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
物性一般(含基礎論)
|
|---|
| Research Institution | Nihon University |
|---|
Principal Investigator |
SATOKO Chikatoshi Nihon University, Department of Physics, Professor, 文理学部, 教授 (30113426)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YASUDA Hidehiro Osaka University, Research Center for UVE Microscopy Research Associate, 超高圧電子顕微鏡センター, 助手 (60210259)
SAWADA Shinichi Kansei-Gakuin University, Department of Physics, Professor, 理学部, 教授 (80253904)
IKEDA Kensuke Ritsumei University, Department of Physics, Professor, 理工学部, 教授 (40151287)
|
|---|
| Project Period (FY) |
1999 – 2000
|
| Project Status |
Completed (Fiscal Year 1999)
|
| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
|
|---|
| Keywords | molecular dynamics / alloying mechanism / metal cluster / interaction between metal atoms |
|---|
| Research Abstract |
We carried out the investigation of a spontaneous alloying mechanism by the theoretical methods such as the molecular dynamics (the interaction between the atoms uses the two-body Morse potential, Petiffor potential and embedded atom model potential), the electronic structure calculation, and the experiments such as electron microscope observation etc. We get the following results : If the size of the clusters is less than the critical radius and the temperature is not so low, the inside atoms are in solid-phase state, and the outside atoms are in the melting state and moves furiously around the surface. As the number of the surface atoms is more in comparison with the atom number of the whole cluster, the local exchange between the atoms around the surface region occurs so frequently that the inside atom is pushed out from the inside region. It is conceivable that spontaneous alloying is breaking out with the mechanism that calls the skin-peeling dynamics. On the other hand, alloying behavior and phase stability has been studied by transmission electron microscopy experiments using clusters in the Au-Sn, Au-Sb, Au-Sn-Pb alloy-nano-particles. We observed the following fine structure : although the composition of alloy clusters falls in the two-phase region for the bulk alloy, the fine structure is in the amorphous-like phase stabilized in nm-sized alloy clusters. We continue to study the theoretical and experimental research that the nano-alloy particle has the unique complicated behavior dependent on the chemical property between the constitution atom.
|
