Crystal structure of three Ni-Mn-Ga alloys in powder and bulk materials

被引：52
|
作者：
Ge, Y
Söderberg, O
Lanska, N
Sozinov, A
Ullakko, K
Lindroos, VK
机构：
[1] Helsinki Univ Technol, Met Phys & Sci Mat Lab, Espoo 02015, Finland
[2] Helsinki Univ Technol, Biomed Engn Lab, Espoo 02015, Finland
来源：
JOURNAL DE PHYSIQUE IV | 2003年 / 112卷
关键词：
D O I：
10.1051/jp4:20031031
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In NiMnGa alloy the crystal structure of low temperature phase is strongly related to transformation temperature. In the present study three NiMnGa alloys with different transformation temperatures were studied. Alloy A has the martensitic start temperature (M-s) near ambient temperature and M. of Alloy B is near Curie point (T-C) whereas M-s of Alloy C M-s is well above T-C. The crystal structures of three alloys were studied by X-ray diffraction in powder and bulk materials. The low temperature phase of single crystal in Alloy A was tetragonal phase with c < a, in Alloy B it was mixture of orthorhombic phase and tetragonal phase with c > a, and in Alloy C such a phase was tetragonal phase with c > a. The crystal structure of Alloy A in bulk material is in good agreement with powder diffraction, but in Alloys B and C there is a lack of conformity between bulk and powder. Furthermore, the difference of crystal structure in powder and bulk is discussed in more detail.
引用
收藏
页码：921 / 924
页数：4
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