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首页> 外文学位 >VIBRATIONAL DYNAMICS OF AMORPHOUS METALS BY INELASTIC NEUTRON AND RAMAN SCATTERING (METALLIC GLASSES, SPECTROSCOPY, THIN FILM, FERRO-MAGNETIC, SPUTTER DEPOSITION).
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VIBRATIONAL DYNAMICS OF AMORPHOUS METALS BY INELASTIC NEUTRON AND RAMAN SCATTERING (METALLIC GLASSES, SPECTROSCOPY, THIN FILM, FERRO-MAGNETIC, SPUTTER DEPOSITION).

机译：非晶态中子和拉曼散射对非晶态金属的振动动力学（金属玻璃，光谱学，薄膜，铁磁，溅射沉积）。

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摘要

Time-of-flight inelastic neutron scattering and Raman measurements were performed on amorphous (a-) metals. The neutron weighted vibrational density of states, G(E), obtained for a-Fe(,78)P(,22), a-Ni(,82)B(,18) and a-Ni(,67)B(,33) transition metal-metalloid alloys (TM-m), indicated two major vibrational bands: a low frequency acoustic-like band and a high frequency optic-like band which are derived from TM-TM and TM-m interactions, respectively. Similar neutron measurements were performed on the corresponding polycrystalline (c-) alloys, c-Fe(,3)P and c-Ni(,2)B.; A comparison of the amorphous and crystalline densities of states indicates the elimination of sharp features and the addition of vibrational states at low and high frequencies upon amorphization. The experimental G(E) results for a-Fe(,78)P(,22) are in good agreement with the theoretically predicted spectrum. Differences in peak positions are attributed to weaker Fe-Fe and Fe-P interaction strengths. The results are consistent with similar shortrange order in the amorphous and crystalline systems.; A comparison between the a-Ni(,67)B(,33) and the phenomenologically broadened c-Ni(,2)B spectrum indicates a change in the short-range order. This finding is consistent with structural measurements on this alloy. The results for the Fe-P and Ni-B systems indicate an increase in the TM-m bonds strength for the Fe-P alloy, suggesting a greater degree of covalency in that system.; Raman measurements were carried out using interference enhanced Raman Spectroscopy (IERS) on thin film Ni-B alloys. The measured spectra provide information about the weighted phonon density of states, and is in good agreement with the neutron results. This first observation of Raman scattering from an amorphous metal implies that the study of thin film noncrystalline metals is now feasible.
机译：飞行时间非弹性中子散射和拉曼测量是在非晶（a-）金属上进行的。对于a-Fe（，78）P（，22），a-Ni（，82）B（，18）和a-Ni（，67）B（，）获得的中子加权振动密度G（E） ，33）过渡金属-准金属合金（TM-m）指出了两个主要的振动带：分别从TM-TM和TM-m相互作用推导出的低频类声带和高频类声带。对相应的多晶（c-）合金c-Fe（，3）P和c-Ni（，2）B进行了类似的中子测量。非晶态和晶态密度的比较表明，非晶态消除了尖锐的特征，并在低频和高频下增加了振动态。 a-Fe（，78）P（，22）的实验G（E）结果与理论预测的光谱非常吻合。峰位置的差异归因于Fe-Fe和Fe-P相互作用强度较弱。结果与非晶和晶体系统中类似的短程顺序一致。 a-Ni（，67）B（，33）与现象学上拓宽的c-Ni（，2）B光谱之间的比较表明，短程顺序发生了变化。这一发现与对该合金的结构测量结果一致。 Fe-P和Ni-B体系的结果表明，Fe-P合金的TM-m键强度增加，表明该体系中的共价度更高。拉曼测量是使用干扰增强拉曼光谱（IERS）对薄膜Ni-B合金进行的。测得的光谱提供了有关加权态声子密度的信息，并且与中子结果非常吻合。从非晶态金属拉曼散射的第一个观察结果表明，薄膜非晶态金属的研究现在是可行的。

著录项

  • 作者

    LUSTIG, NAFTALI ELIAHU.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 O49;
  • 关键词

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