Studies on controle method of structural and physical properties of quasicrystals

准晶结构和物理性质控制方法的研究

基本信息

批准号：
11640345
负责人：
ISHIMASA Tsutomu
金额：
$ 2.3万
依托单位：
HOKKAIDO UNIVERSITY (2000)Nagoya University (1999)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640345/
关键词：
quasicrystals icosahedral phase superlattice ordered state Al-Pd-Mn Zn-Mg-Ho F-type electrical resistivity ZN-Mg-Ho F2型 F2M型

项目摘要

In order to clarify physical properties of a quasicrystal, we have carried out careful investigation of quasicrystal structure and the relation between the structural perfection of quasicrystals and the physical properties such as magnetic susceptibility, electrical resistivity and magneto resistance. The Al-Pd-Mn and Zn-Mg-Ho quasicrystals were selected for this purpose, both of which belong to so-called "ideal quasicrystal" group. With respect to the Al-Pd-Mn, it was found that the F-type icosahedral quasicrystal, which is stable at high temperature, becomes unstable below approximately 750 C, and transforms to a complicated modulated quasicrystal at the alloy composition of Al71Pd21 Mn8.On the Zn-Mg-Ho icosahedral quasicrystals, it was discovered that the degree of F-type chemical ordering depends on the alloy composition ; highly ordered state realized only near the composition of Zn60Mg30Ho10. Further, increase of annealing temperature causes decrease in the intensity of superlattice reflections in the X-ray diffraction pattern. It was experimentally shown that the decreuse of the intensity is related to change of behavior of electrical resistivity and magneto resistance. This result opened the new controlling method of physical properties of quasicrystals by changing chemical ordering and thus degree of perfection of quasiperiodicity.

为了阐明准晶体的物理特性，我们已经仔细研究了准晶体结构以及准晶体的结构完美与物理特性之间的关系，例如磁敏感性，电阻率和磁电阻。为此，选择了Al-Pd-Mn和Zn-Mg-Ho准晶体，这两者都属于所谓的“理想准晶体”组。 With respect to the Al-Pd-Mn, it was found that the F-type icosahedral quasicrystal, which is stable at high temperature, becomes unstable below approximately 750 C, and transforms to a complicated modulated quasicrystal at the alloy composition of Al71Pd21 Mn8.On the Zn-Mg-Ho icosahedral quasicrystals, it was discovered that the degree of F-type chemical排序取决于合金成分；高度有序的状态仅在ZN60MG30HO10的组成附近实现。此外，退火温度的升高会导致X射线衍射模式中超晶格反射强度的降低。实验表明，强度的破坏与电阻率和磁电阻行为的改变有关。该结果通过改变化学秩序和逆碘化的完美程度，开发了新的准晶体物理特性方法。