中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 10 No. 6 December 2000 |
（1. Department of Applied Physics, Central South University, Changsha 410083, P.R.China;
2. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, P.R.China）
Abstract:The method for preparing a new solid lubrication system of nano S-W-S was presented. The microstructur of the S-W-S nano cluster was investigated using TEM and XRD. The system is a mixture clusters of both monocrystal and polycrystal of layered hexagonal structure with one tungsten atom linking with two sulphur atoms, and the week Van der Waals’force bonding together the different layers. The changes of electronic structure were studied with XPS. The
hybridization of different electronic shell orbitals of the sulphur atom in the nano cluster is regarded as the quantum size effect. The clusters are found to be of a closed spherical structure without any dangling bond.
Key words: solid lubrication system; nanometer cluster; quantum size effect
