Phonon softening and martensitic transformation in alpha-Fe

被引：49

作者：

Neuhaus, J ^{[1
]}

Petry, W ^{[1
]}

Krimmel, A ^{[1
]}

机构：

[1] HAHN MEITNER INST BERLIN GMBH,D-14109 BERLIN,GERMANY

来源：

PHYSICA B | 1997年 / 234卷

关键词：

transitions; phonon dispersion; lattice dynamics;

D O I：

10.1016/S0921-4526(96)01185-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The phonon dispersion of the low-temperature BCC-phase of pure iron (alpha-Fe) was investigated as a function of temperature. A strong softening of the entire T-1[xi xi 0] and T-1[xi xi 2 xi] branch is observed on approaching the martensitic alpha-gamma-phase transition temperature. The eigenvectors of these phonons are in the direction of displacements needed for the transformation to the FCC-(gamma-) phase. This indicates low potential barriers for displacements towards the closed-packed structure and can be interpreted as a dynamical precursor for the martensitic phase transition.

引用

页码：897 / 899

页数：3

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