2012 Fiscal Year Final Research Report
Synthesis of composition-controlled iron-based nanoparticles for application to magnetic refrigeration
| Project/Area Number |
23760620
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical properties of metals
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| Research Institution | Tohoku University |
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Principal Investigator |
FUJIEDA Shun 東北大学, 多元物質科学研究所, 助教 (60551893)
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| Research Collaborator |
SUZUKI Shigeru 東北大学, 多元物質科学研究所, 教授 (40143028)
SHINODA Kozo 東北大学, 多元物質科学研究所, 准教授 (10311549)
BALACHANDRAN Jeyadevan 滋賀県立大学, 工学部, 教授 (80261593)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 電子・磁気物性 / 相転移 |
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| Research Abstract |
FePt nanoparticles composed of crystalline fcc-FePt alloy phase and poorly crystallized Fe- and Pt-oxide phase were synthesized in polyol solution. In X-ray diffraction patterns of the specimens which were heat-treated at temperatures above 573 K in a mixture of 5%H_2 in Ar, diffraction peaks corresponding to superlattice lines of L1_0 type structure were observed. It is highly probable that such disorder-order transformation of FePt nanoparticles is accompanied by compositional homogenization due to the reduction of the poorly crystallized Fe- and Pt-oxide phase. It was also shown that intermediate fine particles precipitated in poyol solution containing Fe and Ni salts were reduced during post-annealing in a mixture of 5%H_2 in Ar. Such technique is useful to synthesis FeNi alloy fine particles over a wide composition range.
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