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本质上产生的，并且可以很好地确定以强烈影响其物理和机械性能。本研究的目的是通过X射线衍射和磁性测量和进一步的二进制和L2_1（Heusler）型有序结构来确定二进制和三元间的金属间化合物中的点缺陷结构以及磁性行为[小于或等于] C [小于或等于] 0.6）作为组成和淬火温度的功能。对于任何组成，获得的晶格常数和平均磁矩显示出B2相区域的淬火温度降低，而它们在A2相区域中保持几乎恒定。这些行为是根据LRO参数考虑的。结果，观察到的变化是……在LRO参数方面相对于线性形式，发现了更多的变化。在假设它与邻近的co atom的数量成正比的情况下，该线性关系得到了很好的解释。Furthermore研究了三元cofe_ <1-x> al_x合金的结构属性和磁性行为（0 [比或等于] x [比或等于] 1）。 B2相存在于组成和温度的宽范围内，而L2_1期则出现在大约973K以下的化学计量组成（CO_2FEAL）周围。在B2相区域，随着X的增加，平均磁矩几乎线性降低。此外，与CO_ <1-C> Fe_c合金中的淬火温度的升高显示出降低。另一方面，在L2_1相区域中，磁矩没有明显的淬火温度依赖性，几乎具有与B2相相同的值。这些趋势表明，在共同点上的无序会导致磁矩的减少（B2相病例），而Fe-和Al-sites之间的磁力下降并不显着影响磁矩（L2_1相病例）。较少的

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