Nano-Structure of Amorphous and Cluster-Assembled Materials

非晶和团簇组装材料的纳米结构

• 批准号: 09045044
• 负责人: SUZUKI Kenji
• 金额: $ 1.54万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09045044/
• 关键词: amorphous; nano-cluster; thermal stability; magnetic property; optical property; chalcogenide; granular material; mechanical milling

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.

非平衡材料，如非晶和纳米晶的晶体和簇组装的材料显示出上级磁性，光学，机械和耐腐蚀性能相比，平衡晶体材料。在本项目中，我们通过东北大学材料研究所和艾斯尤特大学物理系（埃及）之间的人员交流和合作，研究了非晶和纳米晶材料的热稳定性和磁弛豫现象。1）用X射线衍射、差示扫描量热和透射电子显微镜对快淬法制备的二元As_xSe_3<1.x>和Bi_xSe_4<1.x>合金薄膜以及三元Ge_<20>Se_<60>Sb_3<20>和As_<46>Te_<46>In_8合金薄膜进行了测量。在二元薄膜中，非晶相和晶相共存，而在三元薄膜中，非晶相占主导地位。这些薄膜的晶化温度约为500 K。在本项目的重要样品--三元薄膜中，在500 K以上出现了晶化相，晶粒尺寸迅速增大，并观察到了伴随着非晶-晶转变的光反射和光吸收光谱变化。2）采用离子束方法制备了Fe/Au颗粒膜。磁性测量表明Fe团簇具有超顺磁性。由穆斯堡尔谱估算的磁弛豫时间与由磁化率的频率和温度依赖性推断的磁弛豫时间一致。3）采用机械球磨和等离子烧结的方法制备了TiN化合物和Al/SiC复合材料。这些材料具有近乎全密度、高强度和高硬度的特点，是制备纳米晶耐火材料的理想材料。

项目成果

M.Sherif El-Eskandarany: "Synthesis of Full-Density Nanocrystalline Titanium Nitride Compacts by Plasma Activated Sintering of Mechanically Reacted Powder" Metall.&Mat.Trans.A. (印刷中). (1998)

M.Sherif El-Eskandarany：“通过等离子体活化烧结机械反应粉末合成全密度纳米晶氮化钛复合片”Metall.&Mat.Trans.A（出版中）。

M.Sherif E1-Eskandarany: "Consolidation of Ball-Milled (A1-TM) -SiC (TM=Ti, Mo and Cu) Composite Powders by Plasma Activated Sintering" 粉体および粉末冶金. 44. 1143-1147 (1997)

M.Sherif E1-Eskandarany：“通过等离子体激活烧结固结球磨 (A1-TM) -SiC（TM=Ti、Mo 和 Cu）复合粉末”粉末和粉末冶金。 44. 1143-1147 (1997)

M.Sherif El-Eskandarany M.Omori, K.Sumiyama, T.Hirai and K.Suzuki: "Consolidation of Ball-Milled (Al-TM)-SiC (TM=Ti, Mo and Cu) Composite Powders by Plasma Activated Sintering." J.Jpn.Soc.Powder & Powder Metallurgy. 44. 1143-1147 (1997)

M.Sherif El-Eskandarany M.Omori、K.Sumiyama、T.Hirai 和 K.Suzuki：“通过等离子体激活烧结固结球磨 (Al-TM)-SiC（TM=Ti、Mo 和 Cu）复合粉末

M.Sherif El-Eskandarany, M.Omori, T.J.Konno, K.Sumiyama, T.Hirai and K.Suzuki: "Synthesis of Full-Density Nanocrystalline Titanium Nitride Compacts by Plasma Activated Sintering of Mechanically Reacted Powder" Metall.& Mat.Trans.A. (in press.). (1998)

M.Sherif El-Eskandarany、M.Omori、T.J.Konno、K.Sumiyama、T.Hirai 和 K.Suzuki：“通过等离子体激活机械反应粉末烧结合成全密度纳米晶氮化钛复合片”Metall。

M.Sherif El-Eskandarany: "Consolidation of Ball-Milled(Al-TM)-SiC(TM=Ti,Mo and Cu) Composite Powders by Plasma Activated Sintering" 粉体および粉末治金. 44. 1143-1147 (1997)

M.Sherif El-Eskandarany：“通过等离子体激活烧结固结球磨 (Al-TM)-SiC(TM=Ti、Mo 和 Cu) 复合粉末”粉末和粉末冶金。