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162 results on '"Jiang, S.S."'

35. Long-term stability of a quasiperiodic Ta/Al multilayer: disintegration at room temperature analyzed by grazing angle x-ray scattering and photoelectron spectroscopy

Author

Yang, P., Klemradt, U., Tao, Y., Peisl, J., Peng, R.W., Hu, A., and Jiang, S.S.

Subjects
Tantalum -- Research, Aluminum -- Research, Thin films, Multilayered -- Research, Semiconductors -- Thermal properties, Photoelectron spectroscopy -- Usage, Physics
Abstract

The structural analysis of a three-component Fibonacci (3CF) Ta/Al multilayer after extensive aging at room temperature was conducted. The objectives were to assess the long-term material properties of Ta/Al multilayers as well as the effect of degradation-induced disorder on the quasiperiodic diffraction spectrum. Results indicate that Ta/Al bilayers are unsuitable for multilayer applications due to the lack of thermal stability even at room temperature.

Published
1999

41. Raman scattering by longitudinal acoustic phonons in metallic W/Ti Fibonacci superlattice

Author

Pan, F.M., Jin, G.J., Wu, X.L., Feng, J.W., Hu, A., and Jiang, S.S.

Subjects
Raman effect -- Research, Phonons -- Research, Superlattices as materials -- Research, Physics
Abstract

Raman scattering from longitudinal acoustic phonons in W/Ti Fibonacci superlatice was investigated. Doublet peaks due to the folded longitudinal acoustic phonons were seen in the Raman spectra as expected. Based on the Kronig-Penney model or the Rytov model, both the normal-mode frequencies and scattering intensities were numerically computed by a transfer-matrix technique. There was noticeable agreement between the results of quantitative computations and empirical data.

Published
1996

45. Precise determination of the periodicity for Mo Si and W C metallic multilayers by electron and x-ray diffraction

Author

Jiang, S.S., Zou, J., Cockayne, D.J.H., Hu, A., and Sikorski, A.

Subjects
Metallic films -- Research, Diffraction patterns -- Research, Physics
Abstract

Transmission electron microscopy and x-ray and electron diffraction methods help measure the periodicity for W C and Mo Si metallic multilayers grown by magnetron sputtering. Satellite spacing in the low-angle regions of the diffraction patterns yield the modulation wavelength values for the multilayers. Comparison of the refraction corrections of the Bragg condition for the x-ray and electron diffraction patterns reveals that they are different.

Published
1995

46. Longitudinal phonon modes in a ZnSe/ZnSxSe1-x lattice-mismatched superlattice

Author

Hua Xia, Jiang, S.S., Wei Zhang, Zhang, X.K., Guan, Z.P., and Fan, X.W.

Subjects
Superlattices as materials -- Research, Lattice dynamics -- Analysis, Phonons -- Scattering, Physics
Abstract

Light scattering studies of longitudinal phonon modes in a ZnSe/ZnS(x)Se(1-x) lattice-mismatched superlattices reveal that the structure associated with the mismatch does not change for both acoustic and optical phonons. Calculated longitudinal elastic constants agree with the values predicted by an unstrained effective medium model. Raman spectroscopic studies help analyze the relationship between measured elastic constants and the lattice mismatch. A correlative study of fitting the spectra to a spatial correlation model helps derive the strain information. This calculation produces the observed longitudinal optical modes without incorporating the strain-related effects.

Published
1994

47. Synchrotron radiation topography studies of twinning in NdP5O14 crystals

Author

Huang, X.R., Hu, Z.W., Jiang, S.S., Jiang, J.H., Tian, Y.L., Han, Y., and Wang, J.Y.

Subjects
Neodymium -- Research, Crystals -- Structure, Synchrotron -- Usage, Physics
Abstract

White-beam synchrotron X-ray topographic studies of twin structures in NdP5O14 single crystals reveals that the a-type twins along the a-axis are displaced. The displacement measurement indicates presence of monoclinic distortion associated with unit cell parameters. The twin structure of NdP5O14 is obtained from the fine-beam Laue diffraction pattern of the compound.

Published
1994

48. The geometry of misfit dislocations with respect to the strained interface in (001) In(sub 0.1)Ga(sub 0.9)As/GaAs single heterostructures

Author

Zou, J., Cockayne, D.J.H., and Jiang, S.S.

Subjects
Thin films, Multilayered -- Research, Dislocations in crystals -- Analysis, Transmission electron microscopes -- Usage, Physics
Abstract

Transmission electron microscope facilitated the study of misfit dislocation geometry of the strained interface in InGaAs/GaAs single heterostructures. The interaction dislocation elasticity theory elucidated the gliding of misfit dislocation toward the substrate away from the strained surface. InGaAs/GaAs heterostructures exhibited a useful energy gap that ranged from 0.36 to 1.42 electron volts.

Published
1994

49. Enhancement of the shear elastic constant in periodic and quasiperiodic Ta/AI superlattices

Author

Carlotti, G., Socino, G., Hu, An, Xia, Hua, and Jiang, S.S.

Subjects
Superlattices as materials -- Research, Stress analysis (Engineering) -- Research, Physics
Abstract

Shear elastic constant enhancement in quasiperiodic and periodic Ta/Al superlattices are due to the presence of atomic plane interfaces. The enhancement due to these interfaces, which extend over several atomic planes, is attributed to the mutual interdiffusion between Al and Ta.

Published
1994

50. Synchrotron x-ray topography study of Er-doped LaP5O14 crystal

Author

Hu, Z.W., Huang, P.Q., Jiang, S.S., Wang, J.Y., Jiang, J.H., and Zhao, J.Y.

Subjects
Crystals -- Research, Synchrotron radiation -- Analysis, X-rays -- Analysis, Physics
Abstract

Synchrotron radiation white beam X-ray topography facilitated the observation of growth bands and growth sector boundaries in Er-doped LaP5O14 (LPP) ferroelastic crystal and a type of abnormal boundary. Local displacements of La ions, as a result of local stress concentration along the (001) direction, caused abnormal boundary formation. The growth band and growth sector boundaries are LPP's primary defects.

Published
1993

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