On the Superstructure of the Ordered Alloy Cu3Pd. III. High Temperature Electron Diffraction Study

1959 ◽  
Vol 14 (4) ◽  
pp. 436-443 ◽  
Author(s):  
Denjiro Watanabe
1987 ◽  
Vol 26 (Part 2, No. 10) ◽  
pp. L1714-L1717 ◽  
Author(s):  
Takashi Onozuka ◽  
Mamoru Omori ◽  
Makoto Hirabayashi ◽  
Yasuhiko Syono

JETP Letters ◽  
2015 ◽  
Vol 100 (11) ◽  
pp. 719-723 ◽  
Author(s):  
E. S. Demidov ◽  
V. V. Podol’skii ◽  
V. P. Lesnikov ◽  
E. D. Pavlova ◽  
A. I. Bobrov ◽  
...  

Symmetry ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 38
Author(s):  
Rimon Tamari ◽  
Benjamin Grushko ◽  
Louisa Meshi

Binary high temperature “Al3Mn” (T-phase) and its extensions in ternary systems were the subjects of numerous crystallographic investigations. The results were ambiguous regarding the existence or lack of the center of symmetry: both Pna21 and Pnam space groups were reported. Our research on the Al–Mn–Pt T-phase allowed concluding that inside a continuous homogeneity region, the structure of the Al-rich T-phase (e.g., Al78Mn17.5Pt4.5) belongs to the non-centrosymmetric Pna21 space group, while the structure of the Al-poor T-phase (such as Al71.3Mn25.1Pt3.6) is centrosymmetric, i.e., Pnam. Following metallurgical and crystallographic considerations, the change in the symmetry was explained.


1990 ◽  
Vol 04 (09) ◽  
pp. 605-611 ◽  
Author(s):  
X. F. ZHANG ◽  
Y. F. YAN ◽  
K. K. FUNG

Cleaved specimens of layered compounds Bi 2 Sr 2( CaCuO 2)n CuO 6, n = 0, 1 and 2 phases have been studied by convergent beam electron diffraction. The identity and the symmetry of the phases have been determined from the higher order Laue zone (HOLZ) rings and the symmetry of their [001] patterns. In the case of Bi 2 Sr 2 CuO 6, the [001] axial periodicity corresponds to the component of the wave vector of the monoclinic modulation along the c axis. Widely different axial periodicities have been obtained. This is interpreted as the manifestation of the variation of the monoclinic modulation. The presence of basal stacking fault lowers the symmetry of the [001] pattern.


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