Production of Quasicrystalline Alloys, Their Structures and Physical Properties

准晶合金的生产、其结构和物理性能

• 批准号: 61460029
• 负责人: TAKEUCHI Shin
• 金额: $ 4.99万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460029/
• 关键词: quasicrystal; single-phase quasicrystal; multi-component alloy; electrical resistivity; resistivity anomaly; 磁性; 超急冷法; ペンローズ格子; 電子線回折; Al合金; 局在電子

The purpose of the research in to produce high-quality quasicrystalline alloys and to investigate physical properties characteristic of quasicrystals.(1) Production of high-quality quasicrystals (a) Al-Mn based alloys: We have first determined the composition range of Al-Mn bianry alloys in which single-quasicrystalline phase is produced by melt-quenching. Then we have clarified the composition region of the quasicrystalline phase for ternary Al-Mn-Si system and further tried to improve the quality by subsitution of 14 transition elements for Mn. As a result, we have succeed in obtaining excellent-quality and very stable quasicrystalline phase for some quaternary systems such as Al-Ru-Mn-Si. (b) Simple Metal systems: We have also determined the composition region of single-quasicrystalline phase for the ternary Mg-Al-Zn systems. We have also produced large grain quasicrystals of Al-Li-Cu alloy.(2) Electrical resistivities of quasicrystals We have measured the electrical resistivity and the magnetic susceptivility for the produced single-phase quasicrystalline alloys. the resistivities of Al-Mn systems are as high as the order of 1 m cm and have a negative temperature coefficent. Below about 50K, we observed an anomalous resistivity increase, the amount of which has been found to be closely related to the localized magnetic moment of Mn. The magneto-resistance is negative in the -logT-dependent region, in contradictory with the Kondo effect. This resisitivity anomaly has been tentatively interpreted by the critical state of electrons in the quasicrystalline state. Systematic measurements for simple-metal quasicrystals such as Mg-Al-Zn and Al-Li-Cu are in progress.

本研究的目的在于制备高质量的准晶合金，并研究准晶合金的物理性能特征。(1)高质量准晶的制备（a）Al-Mn基合金：首次确定了Al-Mn系合金的成分范围，在此范围内，熔体淬火可产生单一准晶相。在此基础上，明确了Al-Mn-Si三元系准晶相的组成区域，并尝试用14种过渡元素替代Mn，以进一步提高准晶相的质量。结果，我们成功地获得了Al-Ru-Mn-Si等四元系的高质量和非常稳定的准晶相。(b)简单金属系统：我们还确定了三元Mg-Al-Zn系统的单准晶相的组成区域。我们还制备了大晶粒Al-Li-Cu合金准晶。(2)准晶的电阻率我们测量了所制备的单相准晶合金的电阻率和磁导率。Al-Mn系的电阻率高达1 m cm-3量级，并具有负温度系数。在50 K以下，我们观察到电阻率的异常增加，其量已被发现与Mn的局域磁矩密切相关。在-logT依赖的区域，磁电阻是负的，与近藤效应相矛盾。这种电阻率异常已被初步解释的准晶态电子的临界状态。对Mg-Al-Zn和Al-Li-Cu等简单金属准晶的系统测量正在进行中。

项目成果

竹内伸: 日本物理学会誌. 40. 961-963 (1985)

Takeuchi, Shin：日本物理学会杂志 40. 961-963 (1985)。

S. Takeuchi,et al.: "Strucure of AL_4Mn Decagonal Phase as a Penrose-Type Lattice" J. Phys. Soc. Jpn.56. 982-988 (1987)

S. Takeuchi 等人：“彭罗斯型晶格的 AL_4Mn 十角相结构”J. Phys。

K. Kimura,et al.: "Electrical Properties of Single Phase A1-Based Quasicrystals" Proc. Intern. Workshop on Quasicrystals (Beijin). (1988)

K. Kimura 等人：“单相 A1 基准晶体的电性能”Proc。

井野博満: "Proc.Intern.Workshop on Quasicrystals(Beijin)" Local Atomic Configuration Studied by Mossbauer Spectroscopy and Crystallographic Texture in Al-Mn Based Quasicrystals, (1988)

Hiromitsu Ino：“Proc.Intern.Workshop on Quasicrystals（北京）”通过穆斯堡尔光谱和 Al-Mn 基准晶中的晶体织构研究局域原子构型，（1988）

H. Yamane,et al.: "Production of A1-Based Ternary and Quaternary Icosahedral Phases" Proc. Intern. Workshop on Quasicrystals (Beijin). (1988)

H. Yamane 等人：“基于 A1 的三元和四元二十面体相的生产”Proc。