A study of electronic properties in quasicrystals with resonant X-ray flourescence

共振X射线荧光研究准晶体的电子性质

• 批准号: 11640368
• 负责人: WATANABE Yasuhiro
• 金额: $ 2.3万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640368/
• 关键词: quasicrystal; resonant flourescense; SOR; icosahedral phase; decagonal phase; Al-Pd-Mn; Al-Mn-Si; Al-Mn-Fe-Ge

The objective of this report is to clarify the electronic structure in some quasicrystals by using resonant X-ray fluorescence spectroscopy, which has been developed recent decade. (1) Mn-Kβ photoemission spectra in four kinds of alloy of quasicrystals and (2) Lα and Lβ spectra in Rear Earth systems were measured in three beam time at the photon factory in High Energy Accelerator Research Organization.The dependence Mn Kβ_<1,3> (3p->1s) photo emission spectra on the incident photon energy were measured in the quasicrystals of F type icosahedral Al-Pd-Mn (i-Al-Pd-Mn), P type icosahedral Al-Mn-Si (i-Al-Mn-Si), α-phase which is approximant of i-Al-Mn-Si and decagonal Al-Mn-Fe-Ge (d-Al-Mn-Fe-Ge). For d-Al-Mn-Fe-Ge, Fe Kβ_<1,3> spectrum was also measured. Manganese compounds (oxides and KMnO_4) spectra were also collected as a standard of non-metallic materials. All these spectra of quasicrystals shows very small Kβ' peak, the ratio of which to Kβ_<1,3> means the splitting between density o … More f state of high spin and low spin, and were similar to that of KMnO4 (+7). The spectrum of i-Al-Mn-Si was almost consistent with α phase. It indicates that the electronic structures of them are very close although the structure α phase has only the second approximate structure to the Al-Mn-Si quasicrystal. The whole profile i-Al-Pd-Mn was also similar to those but there was a characteristic hump at the energy between Kβ_<1,3> peak and Kβ', which hump has not been reported in any other materials. The peak height ratio of Kβ' to Kβ_<1,3> in d-Al-Mn-Fe-Ge is the highest in these quasicrystal. It may originate in the splitting of d-state because only this system shows ferromagnetism in these quasicrystals.The photoemission spectra of Lα_<1,2> and Lβ_1 in F-type icosahedral Zn-Mg-RE (RE : Ho, Dy) were measured at room temperature. They shows the large quadropole peak which peak energy increase with increasing in the incident X-ray energy. The degree of quadropole splitting are almost the same in both system although the shape of peaks have small difference between them. Less

本文利用近十年来发展起来的共振X射线荧光光谱技术研究了一些准晶的电子结构。(1)在高能加速器研究组织的光子工厂测量了四种准晶合金的Mn-Kβ光电子能谱和稀土系统的Lα和Lβ光电子能谱，测量了F型二十面体Al-Pd-Mn准晶的MnK β <1，3>（3 p-> 1 s）光电子能谱与入射光子能量的关系（i-Al-Pd-Mn）、P型二十面体Al-Mn-Si（i-Al-Mn-Si）、近似于i-Al-Mn-Si的α相和十面体Al-Mn-Fe-Ge（d-Al-Mn-Fe-Ge）。对于d-Al-Mn-Fe-Ge，还测量了Fe Kβ <1，3>谱。同时收集了锰化合物（氧化物和KMnO_4）的光谱作为非金属材料的标准。所有这些准晶的光谱都显示出很小的Kβ'峰，它与Kβ_<1，3>的比值意味着准晶的密度和密度之间的分裂。 ...更多信息 f态的高自旋和低自旋态，并与KMnO_4（+7）类似。i-Al-Mn-Si相的光谱与α相的光谱基本一致。结果表明，虽然α相的结构与Al-Mn-Si准晶的结构相似，但它们的电子结构非常接近。i-Al-Pd-Mn的全谱也类似于这些，但在Kβ_（1，3）峰和K β_（1，3）峰之间的能量处有一个特征峰，这个峰在其它材料中未见报道。d-Al-Mn-Fe-Ge准晶中Kβ'与Kβ <1，3>的峰高比最高。在室温下测量了F型二十面体Zn-Mg-RE（RE：Ho，Dy）中Lα <1，2>和Lβ 1的光电子能谱。它们显示出大的四极峰，其峰能量随着入射X射线能量的增加而增加。两个系统的四极分裂程度几乎相同，尽管峰的形状略有差异。少

项目成果

Yasuhiro Watanabe: "X-ray magnetic circular dichroism in quasicrystals"Material Science & Engineering A. 294-296. 617-620 (2000)

渡边泰弘：“准晶体中的 X 射线磁圆二色性”材料科学

Y.Watanabe, J.Tamura, H.Shoji, S.Nanao T.Nakamura and Y.Yokoyama: "X-ray Magnetic Cirlular Dichroism in quasicrystals"Material Science & Engineering A. 294-296. 617-620 (2000)

Y.Watanabe、J.Tamura、H.Shoji、S.Nanao T.Nakamura 和 Y.Yokoyama：“准晶体中的 X 射线磁圆二色性”材料科学