Structural investigations of polytypes in Zn1−xMgxSe by transmission electron microscopy and cathodoluminescence

1998 ◽  
Vol 184-185 (1-2) ◽  
pp. 1015-1020
Author(s):  
J Lenzner
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Structural Investigations ◽  
Transmission Electron

Structural Investigations of AMS-n Mesoporous Materials by Transmission Electron Microscopy

2004 ◽  
Vol 16 (5) ◽  
pp. 813-821 ◽  
Author(s):  
Alfonso E. Garcia-Bennett ◽  
Osamu Terasaki ◽  
Shunai Che ◽  
Takashi Tatsumi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Mesoporous Materials ◽  
Structural Investigations ◽  
Transmission Electron

Structural Investigations of (GaIn)(NAs)/GaAs Multi-Quantum-Wells by Transmission Electron Microscopy

2000 ◽  
Vol 618 ◽  
Author(s):  
K. Volz ◽  
A. Hasse ◽  
A.K. Schaper ◽  
T.E. Weiric ◽  
F. Höhnsdorf ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Separation ◽  
Quantum Wells ◽  
Interface Roughness ◽  
Structural Perfection ◽  
Structural Investigations ◽  
Transmission Electron ◽  
High Structural Perfection ◽  
Metastable Material

ABSTRACTThe structure of compressively strained (GaIn)(NAs)/GaAs multi-quantum wells (MQWs) grown by MOVPE is investigated using TEM. The quaternary, metastable material exhibits a high structural perfection if a N concentration of 4% is not exceeded. Phase separation or clustering effects are not observed, and the In is dispersed homogeneously throughout the quantum wells. The interface roughness of the quantum wells to the GaAs barriers is in the order of several monolayers. Increasing the N content to above 4.5% results in a deterioration of the structure and of the homogeneity of the wells

Quasicrystal structures studied by high-resolution transmission electron microscopy

2000 ◽  
Vol 215 (10) ◽  
Author(s):  
Conradin Beeli
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
High Resolution ◽  
Structural Investigations ◽  
Decagonal Quasicrystals ◽  
Transmission Electron ◽  
The Difference ◽  
Diffraction Patterns ◽  
Special Points

Structural investigations, using a transmission electron microscope (TEM), have been highly beneficial for the analysis of icosahedral and decagonal quasicrystals. Many structural properties of quasicrystals can be recognized and quantified by electron diffraction patterns alone. Nevertheless, a much more complete understanding of the real structure of quasicrystals can be achieved by the analysis of high-resolution transmission electron microscopy (HRTEM) images. Compared to diffraction-based techniques, HRTEM offers several advantages, however, special points which must be considered in the interpretation of HRTEM images will be discussed.For the case of 2-dimensional quasicrystals, e.g. the decagonal phases, HRTEM images can directly reveal the (projected) atomic structure as well as the long-range translational order. This is possible because 2-dimensional quasicrystals are periodic along one direction and the atoms thus form periodic atom columns as in crystalline materials. Therefore, the imaging theory established for crystals can similarly be applied to electron micrographs of 2-dimensional quasicrystals taken with the electron beam parallel to the unique periodic axis. It is evident, that possible limitations due to projection effects along the electron beam direction have to be considered in the interpretation of the images. HRTEM images of decagonal quasicrystals have frequently been employed to differentiate between disorder and order, i.e., to infer the difference between a random and perfect quasiperiodic tiling, respectively.

Structural investigations of polytypes in Zn1−xMgxSe by transmission electron microscopy and cathodoluminescence

1998 ◽  
Vol 184-185 ◽  
pp. 1015-1020 ◽  
Author(s):  
U. Falke ◽  
A. Cichos ◽  
F. Firszt ◽  
H. Mȩczyńska ◽  
P. Dłużewski ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Structural Investigations ◽  
Transmission Electron
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