Optical and Structural Properties of α-Si1-xCx Films

1996 ◽  
Vol 423 ◽  
Author(s):  
Zhizhong Chen ◽  
Kai Yang ◽  
Rong Zhang ◽  
Hongtao Shi ◽  
Youdou Zheng
Keyword(s):  
Structural Properties ◽  
Radial Distribution ◽  
Optical Constants ◽  
State Density ◽  
Distribution Functions ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Optical Energy Band Gap ◽  
Atomic Radial Distribution

AbstractIn this paper, we reported experimental results about optical and structural properties of amorphous silicon carbide (α-Si1-xCx). The films of a-Si1-xCx) were grown by CVD on substrate of quartz glass. Optical constants (n-refractive index, a-absorption coefficient, Eg-optical energy band gap) of these films were determined by transmission spectra. The radial distribution functions (RDFs) of α- Sil−xCx) films were drawn out from the data of x-ray diffraction spectra. According to the RDFs, we imagined the statistic scene from which we could obtain the information of atomic radial distribution. The bond lengths and bond numbers of Si-Si, Si-C, and C-C could be also determined by RDFs. From the analysis of Raman spectra, we obtained the information of their vibration state density, and discerned the peaks of bond vibration, which agreed well with the results of α-Si1-xCx) RDF.

Structural Study of a Decagonal Al75Fe15Ni10 Alloy by Anomalous X-ray Scattering (AXS) Method

1991 ◽  
Vol 46 (7) ◽  
pp. 605-608 ◽  
Author(s):  
E. Matsubara ◽  
Y. Waseda ◽  
A. P. Tsai ◽  
A. Inoue ◽  
T. Masumoto
Keyword(s):  
Structural Study ◽  
Radial Distribution ◽  
Distribution Functions ◽  
Radial Distribution Functions ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

A structural study of an as-quenched decagonal Al75Fe15Ni10 alloy has been carried out by anomalous x-ray scattering (AXS) as well as ordinary x-ray diffraction. The environmental radial distribution functions (RDFs) for Fe and Ni determined by the AXS measurements turned out to resemble each other and to be similar to the ordinary RDF obtained by ordinary x-ray diffraction. These results clearly show that the Ni and Fe atoms are homogeneously distributed and occupy the same sites in the decagonal structure of Al75Fe15Ni10.

Structure of Molten Mg, Ca, Sr, and Ba by X-ray Diffraction

1975 ◽  
Vol 30 (6-7) ◽  
pp. 801-805 ◽  
Author(s):  
Y. Waseda ◽  
K. Yokoyama ◽  
K. Suzuki
Keyword(s):  
Structural Information ◽  
Distribution Functions ◽  
X Ray Diffraction ◽  
Interatomic Distances ◽  
X Ray ◽  
Coordination Numbers ◽  
Structure Factors ◽  
Atomic Radial Distribution ◽  
Electron Transport Properties ◽  
Diffraction Patterns

Abstract X-ray diffraction patterns have been measured on molten alkaline earth metals (Mg, Ca, Sr, and Ba) in the temperature range from the melting points to 880 °C. In all cases the structure factors obtained were temperature insensitive. By the usual Fourier transformation of the structure factors, the atomic radial distribution functions were evaluated. From these the interatomic distances and coordination numbers were estimated. The structural information was applied to a discussion of the electron-transport properties using the Ziman theory.

Model Calculation for the Fe80B20 Alloy Glass

1982 ◽  
Vol 37 (6) ◽  
pp. 611-612 ◽  
Author(s):  
T. Fujiwara ◽  
H. S. Chen ◽  
Y. Waseda
Keyword(s):  
Neutron Diffraction ◽  
Model Calculation ◽  
Radial Distribution ◽  
Short Distance ◽  
Random Packing ◽  
Distribution Functions ◽  
Radial Distribution Functions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Model Structures

Abstract Three partial radial distribution functions [RDF’s] are calculated by means of relaxed dense-random packing models for a Fe80B20 glass. The model structures reproduce fairly well recently reported experimental partial RDF's derived from x-ray diffraction and neutron diffraction using isotopic substitutional methods. Most significantly, both the model calculated by means of relaxed dense-random packing models GBB (r), the appearance of a subpeak on the short distance side of the first peak.

On the Structural Characterization of a Series of Novel Ni-Nb-Sn Refractory Alloy Glasses

2003 ◽  
Vol 806 ◽  
Author(s):  
Michelle L. Tokarz ◽  
John C. Bilello
Keyword(s):  
Radial Distribution ◽  
Hard Sphere ◽  
Alloy Composition ◽  
Distribution Functions ◽  
Refractory Alloy ◽  
Distribution Analysis ◽  
X Ray Diffraction ◽  
Characterization Methods ◽  
X Ray ◽  
Hard Sphere Models

ABSTRACTRecently refractory alloy glasses of varying Ni, Nb and Sn concentrations were prepared and studied via several characterization methods, including x-ray diffraction via standard lab and synchrotron radiation sources, SEM, and other complementary techniques. A comparison between x-ray diffraction results obtained from synchrotron sources vs. standard lab sources shows the necessity of a low-divergence source in order to distinguish nanoscale crystallites present within an amorphous matrix. The divergence of both sources was determined by comparing the diffraction patterns of a LaB6standard and noting the deviation from ideal or theoretical Bragg peaks. The crystallites in these glasses comprised between 0 and 7.5 percent by volume, depending upon the specific composition. The results presented here also show a very good sample-to-sample consistency for any given alloy composition. While x-ray diffraction results give information about the average structure, SEM was also performed to understand aspects of individual crystallite size and distribution. By studying results of varying alloy concentrations, it is seen that a very small composition range exists for near-perfect glass formers (as defined by a near zero percentage crystallinity). Radial distribution analysis was also performed for each composition and compared to hard sphere models for each alloy composition. This analysis indicated the presence of intermediate range order beyond the first nearest neighbors as indicated by the divergence of the experimental reduced radial distribution functions from that predicted by the accompanying hard sphere models.

scholarly journals Effect of Samarium Nanoparticles on Optical Properties of Zinc Borotellurite Glass System

2016 ◽  
Vol 846 ◽  
pp. 63-68 ◽  
Author(s):  
Saad S. Hajer ◽  
M.K. Halimah ◽  
Azmi Zakaria ◽  
M.N. Azlan
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Fundamental Absorption Edge ◽  
Xrd Analysis ◽  
Ftir Analysis ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Bonding Parameters ◽  
Optical Energy Band Gap

The glass series of samarium nanoparticles (NPs) doped zinc borotellurite glasses were successfully fabricated by using conventional melt-quenching technique. The structural properties of the prepared glasses were investigated by X-ray diffraction (XRD) analysis and FTIR analysis. It was confirmed that the prepared glasses are amorphous in nature. The bonding parameters of the glasses were analyzed by using FTIR analysis and were found the formation of non-bridging oxygen. The density of these glasses were measured and found to be increased with increasing samarium NPs content. The optical absorption spectra of these glasses were revealed that the fundamental absorption edge shifts to higher wavelengths as the content of Sm2O3 (NPs) increases. The optical energy band gap are found to be decreased linearly with an increasing samarium NPs concentration which is due to the formation of non-bridging oxygen in the glass system.KeywordsBorotellurite glass; optical band gap, Samarium nanoparticles.

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