排序方式: 共有1条查询结果,搜索用时 0 毫秒
1
1.
The properties and electronic structure of Fe under pressures of 0–30GPa have been studied by first principles employing the
density functional theory (DFT), the ultra-soft pseudo-potentials (USPP) and the generalized gradient approximation (GGA).
The calculating results show that there is a structural transition from magnetic body-centered cubic (bcc) to nonmagnetic
hexagonal-close-packed (hcp) structure for Fe around 11GPa pressure. There is a pseudogap both in the density of states (DOS)
for bcc and hcp Fe. The pseudogap of bcc Fe is deeper and wider than that of hcp Fe. The elastic modulus is obtained by Voigt-Reuss-Hill
averaging scheme. The results indicate that the elastic properties of bcc Fe enhance with pressure except for elastic stiffness
constant C
11, shear modulus G and elastic modulus E at the transition pressure, while the elastic properties of hcp Fe increase linearly with pressure. Magnetic bcc Fe is ductile,
and hcp Fe becomes ductile from brittle around 25GPa. 相似文献
1