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Digitale Medien

Thermal configurations of oxygen in silicon (1992)

Chen, C. S. ; Zeng, F. Q. ; Huang, Y. X. ; [weitere]

Springer

Applied physics 55 (1992), S. 317-323

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ISSN: 1432-0630

Schlagwort(e): 61.70.−r ; 71.55.−i ; 81.40.−z

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The central position and the infrared absorption coefficient of the 9 μm band of Si samples were measured with Fourier transform infrared spectroscopy (FTIR) at temperatures from T=77 K to 775 K. The infrared absorption coefficients were corrected by considering background absorption and free carrier absorption calculated from the increased free carrier concentration and from the resistivity determined from Hall effect measurements. We found the central position of the 9 μm band to shift to longer wavelengths with increasing temperature. The concentration [Oi] of interstitial oxygen is almost constant for T〈600 K, but decreased rapidly for T〉600 K. These results verified there are two types of thermal configurations of oxygen in silicon: The bonded Si2O configuration with a binding energy E b≈0.8 to 1.0 eV at T≈77 K to 600 K, and the Si2O configuration coexists with a quasi-free interstitial oxygen (QFIO) state for T〉600 K. The lattice potential barrier E L, which retards QFIO atoms from migrating in the lattice, is estimated to be 1.5 to 1.6 eV. From these configurations the anomalous diffusivity of oxygen in silicon can be explained quite well.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00324078

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Digitale Medien

Merits of high resolution electron microscopy in the study of alloy structures (1986)

Kuo, K. H. ; Ye, H. Q. ; Li, D. X.

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 3 (1986), S. 57-66

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ISSN: 0741-0581

Schlagwort(e): High resolution electron microscopy ; Alloy structures ; Domain boundaries ; Solute atoms ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Allgemeine Naturwissenschaft

Notizen: We found that high resolution electron microscopy has the following merits in the study of alloy structures: (1) New phases too small to be studied by x-rays, such as σ-related phases, may be studied; (2) local and highly disordered structures, such as domain boundaries and domains of only a few unit cells, are more easily studied; and (3) it is easier to order solute atoms, such as Ti atoms columns in Cu4Ti.

Zusätzliches Material: 8 Ill.