2002 Fiscal Year Final Research Report Summary
Design of new high pressure apparatus using a phase transition induced by temperature or magnetic field
| Project/Area Number |
12554011
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Kyushu University |
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Principal Investigator |
OOMI Gendo Kyushu university, faculty of science, Professor, 大学院・理学研究院, 教授 (00111146)
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| Co-Investigator(Kenkyū-buntansha) |
OHASHI Masashi Kyushu university, faculty of science, research associate, 大学院・理学研究院, 助手 (10336000)
KAGAYAMA Tomoko Kumamoto university, the faculty of engineering, associate professor, 工学部, 助教授 (40274675)
NISHIDA Minoru Kumamoto university, graduate school of science and technology, associate professor, 大学院・自然科学研究科, 助教授 (90183540)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Martensite transition / high pressure apparatus / physical property of electron / superconductivity |
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| Research Abstract |
The purpose of this project is to design a high pressure apparatus using a material which shows a change of the length on the phase transition induced by temperature or magnetic fields. In the present work, we used a shape memory alloy or giant magnetostrictive alloy as a device to generate high pressure. The results im the present work are summarized as follows,
1)We selected Ti-Ni shape memory alloy to generate a pressure, in which 3% lengh change is expected on the martensitic transformation. This means that 1 mm length change is expected when we use 30 mm Ti-Ni rod. The fundamental properties of this alloy are investigated.
2) By using this Ti-Ni one way shape memory alloy, it was revealed that we can reach about 10 GPa when we use Bridgman type apparatus having a face of 3 mm in diameter.
3) In the usual experiments, we repeat heating and cooling process to obtain the temperature dependence of the physical quantities such as volume or magnetic susceptibilities. For this reason, we used the two ways shape memory alloys in which the change in the length is smaller than that of one way alloys. It is found that we can get 5 GPa by using this alloy.
To conclude, we can reach 10 GPa or more using the Ti-Ni shape memory alloys, which gives a large progress in this research area. By applying this method to the diamond anvils, we will be able to get higher pressure than 10 GPa.
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