Atomic-resolution investigation of structural transformation caused by oxygen vacancy in La0.9Sr0.1TiO3+ titanate layer perovskite ceramics

2021 ◽  
Author(s):  
Yang Zhao ◽  
Yameng Zhu ◽  
Jinpeng Zhu ◽  
Hailong Wang ◽  
Zhuang Ma ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Structural Transformation ◽  
Atomic Resolution ◽  
Perovskite Ceramics

Atomic-Resolution Imaging of Oxygen in Perovskite Ceramics.

ChemInform ◽  
2003 ◽  
Vol 34 (19) ◽  
Author(s):  
C. L. Jia ◽  
M. Lentzen ◽  
K. Urban
Keyword(s):  
Atomic Resolution ◽  
Resolution Imaging ◽  
Perovskite Ceramics

scholarly journals Cooperative Chemical Rebonding In The Segregation Of Impurities In Silicon Grain Boundaries

1996 ◽  
Vol 442 ◽  
Author(s):  
A. Maiti ◽  
M. F. Chisholm ◽  
S. J. Pennycook ◽  
S. T. Pantelides
Keyword(s):  
Grain Boundary ◽  
Ab Initio ◽  
Grain Boundaries ◽  
Structural Transformation ◽  
Atomic Resolution ◽  
Segregation Energy ◽  
Site Variation ◽  
Segregation Of Impurities

AbstractWith ab initio calculations we show that the experimentally observed large segregation energies of As at Si grain boundaries can be explained by the formation of isolated dimers or ordered chains of dimers of threefold-coordinated As along the cores of grain boundary dislocations. We also find the intriguing possibility that As segregation may drive structural transformation of certain grain boundaries. Recently we have obtained the first atomic-resolution STEM images of As in a Si grain boundary, consistent with the formation of As dimers. Segregation energy of As dimers was found to be significantly higher in isolated dislocation cores, where larger site-variation in strain than in grain boundaries lead to further lowering of the electronic levels of As deep into the bandgap.

The structure of pre-mRNA and mRNA from erythroid cells

1978 ◽  
Vol 36 (2) ◽  
pp. 234-235
Author(s):  
A.-M. Ladhoff ◽  
B.J. Thiele ◽  
Ch. Coutelle ◽  
S. Rosenthal
Keyword(s):  
Bone Marrow ◽  
Structural Transformation ◽  
Electron Micrographs ◽  
Ammonium Acetate ◽  
Bone Marrow Cells ◽  
Erythroid Cells ◽  
Globin Mrna ◽  
Ordered Structures ◽  
Rabbit Bone ◽  
Rabbit Reticulocytes

The suggested precursor-product relationship between the nuclear pre-mRNA and the cytoplasmic mRNA has created increased interest also in the structure of these RNA species. Previously we have been published electron micrographs of individual pre-mRNA molecules from erythroid cells. An intersting observation was the appearance of a contour, probably corresponding to higher ordered structures, on one end of 10 % of the pre-mRNA molecules from erythroid rabbit bone marrow cells (Fig. 1A). A virtual similar contour was observed in molecules of 9S globin mRNA from rabbit reticulocytes (Fig. 1B). A structural transformation in a linear contour occurs if the RNA is heated for 10 min to 90°C in the presence of 80 % formamide. This structural transformation is reversible when the denatured RNA is precipitated and redissolved in 0.2 M ammonium acetate.

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