Point defect structure and its relation to the material properties in B2-type and L21-type intermetallic compounds.

B2型和L21型金属间化合物中点缺陷结构及其与材料性能的关系。

• 批准号: 15560575
• 负责人: KOGACHI Mineo
• 金额: $ 2.3万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560575/
• 关键词: B2-type ordered phase; L2_1-type ordered phase; X-ray diffraction; magnetic measurement; phase transition; point defect structure; long-range order; mean magnetic moment; Co_2FeAl合金; ホイスラー相; B2相; 強磁性; 規則・不規則相転移; CoFe合金; 規則-不規則相転移; SQUID磁力計

Point defects are generated intrinsically in alloys at finite temperature and are well established to strongly affect their physical and mechanical properties. Aim of the present research is to determine the point defect structure and the magnetic behavior in binary and ternary intermetallic compounds with B2- and L2_1 (Heusler)-type ordered structure by means of X-ray diffraction and magnetic measurements and further, to discuss correlation between these through the long-range order(LRO) parametersStructural properties and magnetic behavior were studied for B2 Co_<1-c>Fe_c alloys (0.4【less than or equal】c【less than or equal】0.6) as functions of composition and quenching temperature. Obtained lattice constant and the mean magnetic moment, for any compositions, showed a decrease in quenching temperature in the B2-phase region, while they remained almost constant in the A2-phase region. These behaviors were considered in terms of the LRO parameter. As a result, the observed changes were … More found to be well described by a linear form with respect to the square of the LRO parameter. This linear relation was well explained by noting the magnetic moment of Fe atom under assuming that it is proportional to the number of neighboring Co atoms.Furthermore, structural properties and magnetic behavior were studied for ternary CoFe_<1-x>Al_x alloys (0【less than or equal】x【less than or equal】1) as functions of composition and quenching temperature. The B2-phase existed over wide ranges of composition and temperature and the L2_1-phase appeared around the stoichiometric composition (Co_2FeAl) below about 973K. In the B2-phase region, the mean magnetic moment decreased nearly linearly with increase in x. Further, it showed a decrease with increase in quenching temperature, similarly as in the Co_<1-c>Fe_c alloys. On the other hand, in the L2_1-phase region, the magnetic moment showed no remarkable quenching temperature dependence and had nearly the same value as that in the B2-phase. These trends suggest that disordering on the Co-site leads to the decrease in the magnetic moment (B2-phase case), while that between the Fe- and Al-sites does not significantly affect the magnetic moment (L2_1-phase case). Less

点缺陷是在有限温度下在合金中固有产生的，并且已被证实会强烈影响其物理和机械性能。本研究的目的是确定具有 B2- 和 L2_1 的二元和三元金属间化合物的点缺陷结构和磁性行为。通过 X 射线衍射和磁测量得出 (Heusler) 型有序结构，并进一步通过长程有序 (LRO) 参数讨论这些结构之间的相关性，研究了 B2 的结构特性和磁行为Co_<1-c>Fe_c合金（0.4【小于或等于】c【小于或等于】0.6）作为成分和淬火温度的函数获得的晶格常数和平均磁矩，对于任何成分都表现出降低。 B2 相区域的淬火温度，而 A2 相区域的淬火温度几乎保持不变。因此，观察到的变化是根据 LRO 参数来考虑的。很好地用相对于 LRO 参数的平方的线性形式描述了这种线性关系，通过假设 Fe 原子的磁矩与相邻 Co 原子的数量成正比，可以很好地解释这种线性关系。此外，结构特性和磁性。研究了三元CoFe_<1-x>Al_x合金（0【小于或等于】x【小于或等于】1）随成分和淬火温度的变化，B2相在较宽的成分和温度范围内存在。在大约973K以下，在化学计量成分（Co_2FeAl）附近出现L2_1相，在B2相区域中，平均磁矩随着x的增加而几乎呈线性减小，并且随着淬火温度的增加而减小。另一方面，在Co_<1-c>Fe_c合金中，在L2_1相区域，磁矩没有表现出明显的淬火温度依赖性，并且具有几乎相同的特性。这些趋势表明，Co 位点上的无序导致磁矩降低（B2 相情况），而 Fe 和 Al 位点之间的无序不会显着影响磁矩。力矩（L2_1 相情况）。

项目成果

Defect properties and magnetism in B2 CoFe alloys.

B2 CoFe 合金的缺陷特性和磁性。

• 发表时间: 2003
• 期刊: MRS Symp.Proc. 753
• 作者: K.Harada;H.Ishibashi;M.Kogachi
• 通讯作者: M.Kogachi

K.Harada, H.Ishibashi, M.Kogachi: "Defect properties and magnetism in B2-type CoFe alloys."Mat.Res.Soc.Symp.Proc.. 753. 345-350 (2003)

K.Harada、H.Ishibashi、M.Kogachi：“B2 型 CoFe 合金中的缺陷特性和磁性。”Mat.Res.Soc.Symp.Proc.. 753. 345-350 (2003)

Structural properties and magnetic behavior in the Pseudobinary alloys CoFe-CoAl.

伪二元合金 CoFe-CoAl 的结构特性和磁行为。

• 发表时间: 2005
• 期刊: MRS Symposium Proceeding 842
• 作者: N.Tadachi;H.Ishibashi;M.Kogachi
• 通讯作者: M.Kogachi

H.Ishibashi, K.Harada, M.Kogachi, S.Noguchi: "Magnetic properties and long range order parameter in B2-type CoFe alloys."J.Mag.Mag.Mater.. (in press). (2004)

H.Ishibashi、K.Harada、M.Kogachi、S.Noguchi：“B2 型 CoFe 合金的磁性和长程有序参数。”J.Mag.Mag.Mater..（正在印刷中）。

Magnetic properties and long-range order parameter in B2-type CoFe alloys.

B2 型 CoFe 合金的磁性能和长程有序参数。

• 发表时间: 2004
• 期刊: Journal of Magnetism and Magnetic Materials 272-276
• 作者: H.Ishibashi;K.Harada;M.Kogachi;S.Noguchi
• 通讯作者: S.Noguchi