| Project/Area Number |
09045044
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | University-to-University Cooperative Research |
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| Research Field |
Physical properties of metals
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| Research Institution | Tohoku University |
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Principal Investigator |
SUZUKI Kenji Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (10005861)
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| Co-Investigator(Kenkyū-buntansha) |
SAKURAI Masaki Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (80235225)
SHIBATA Kaoru Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (60183836)
KONNO Toyohiko.J Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (90260447)
KAMIYAMA Tomoaki Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (90005926)
SUMIYAMA Kenji Tohoku University, Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (70101243)
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| Project Period (FY) |
1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | amorphous / nano-cluster / thermal stability / magnetic property / optical property / chalcogenide / granular material / mechanical milling |
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| Research Abstract |
Nonequilibrium materials such as amorphous- and nanocrystallinc- and cluster-assembled-materials reveals superior magnetic, optical, mechanical, and corrosion-resistant properties in comparison with equilibrium crystalline materials. In this project, we studied thermal stability and magnetic relaxation phenomena in amorphous and nanocrystalline materials through the human exchange and collaboration between Institute for Materials Research, Tohoku University and Department of Physics, Assiut University (Egypt). The following are the outlines of our results.
1) We measured X-ray diffraction, differential scanning calorimetry and transmission electron micrograph for binary As_xSe_<1.x> and Bi_xSe_<1.x> alloy films, and ternary Ge_<20>Se_<60>Sb_<20> and As_<46>Te_<46>In_8 alloy films prepared by rapid quenching. In the binary films, amorphous and crystalline phases coexist, while in the ternary films, an amorphous phase is predominant. The crystallization temperature is about 500K for these films. In the ternary films, which are importans specimens in this project, the crystalline phase appears and its grain size increases very rapidly above 500K.We are observing spectral chilnges in optical reflection and absorption accompanied by amorphous-crystal transformation.
2) We prepared Fe/Au granular films by an ionized cluster beam method. Magnetic measurements indicate that Fe clusters reveal superparamagnetic characters. The magnetic relaxation time estimated from the Mossbauer spectra is consistent with the one extrapolatcd from the frequency- and temperature-dependence of magnetic susceptibility.
3) We prepared a TiN compound and an Al/SiC composite by mechanical milling and plasma sintering. Thes are good candicates for nanocrystalline refractry materials, which show almost full density, and high mechanical-strength and -hardness.
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