Structural transformations in boron clusters induced by metal doping

2022 ◽  
Author(s):  
Jorge Barroso ◽  
Sudip Pan ◽  
Gabriel Merino
Keyword(s):  
Structural Transformation ◽  
Structural Transformations ◽  
Metal Doping ◽  
Boron Clusters ◽  
Metal Atoms

Would it be possible to eventually derive a simple methodology to predict the structure adopted by boron clusters based on its structural transformation induced by the doping with one or two metal atoms?

Structural Transformation of a Germanium Σ=13 (510) [001] Tilt Grain Boundary under the Electron Beam

1990 ◽  
Vol 48 (1) ◽  
pp. 52-53 ◽  
Author(s):  
Jean-Luc Rouvière ◽  
Alain Bourret
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Grain Boundary ◽  
Structural Transformation ◽  
Mirror Symmetry ◽  
High Resolution Electron Microscopy ◽  
Structural Transformations ◽  
Covalent Bonds ◽  
Resolution Electron ◽  
Tilt Grain Boundary

The possible structural transformations during the sample preparations and the sample observations are important issues in electron microscopy. Several publications of High Resolution Electron Microscopy (HREM) have reported that structural transformations and evaporation of the thin parts of a specimen could happen in the microscope. Diffusion and preferential etchings could also occur during the sample preparation.Here we report a structural transformation of a germanium Σ=13 (510) [001] tilt grain boundary that occurred in a medium-voltage electron microscopy (JEOL 400KV).Among the different (001) tilt grain boundaries whose atomic structures were entirely determined by High Resolution Electron Microscopy (Σ = 5(310), Σ = 13 (320), Σ = 13 (510), Σ = 65 (1130), Σ = 25 (710) and Σ = 41 (910), the Σ = 13 (510) interface is the most interesting. It exhibits two kinds of structures. One of them, the M-structure, has tetracoordinated covalent bonds and is periodic (fig. 1). The other, the U-structure, is also tetracoordinated but is not strictly periodic (fig. 2). It is composed of a periodically repeated constant part that separates variable cores where some atoms can have several stable positions. The M-structure has a mirror glide symmetry. At Scherzer defocus, its HREM images have characteristic groups of three big white dots that are distributed on alternatively facing right and left arcs (fig. 1). The (001) projection of the U-structure has an apparent mirror symmetry, the portions of good coincidence zones (“perfect crystal structure”) regularly separate the variable cores regions (fig. 2).

The Eventfulness of Social Reproduction

2011 ◽  
Vol 29 (4) ◽  
pp. 294-314 ◽  
Author(s):  
Adam Moore
Keyword(s):  
Structural Transformation ◽  
Social Reproduction ◽  
Social Life ◽  
Structural Transformations ◽  
Social Structures ◽  
Stability And Change ◽  
Theoretical Assumptions

The work of William Sewell and Marshall Sahlins has led to a growing interest in recent years in events as a category of analysis and their role in the transformation of social structures. I argue that tying events solely to instances of significant structural transformation entails problematic theoretical assumptions about stability and change and produces a circumscribed field of events, undercutting the goal of developing an “eventful” account of social life. Social continuity is a state that is achieved just as much as are structural transformations, and events may be constitutive of processes of reproduction as well as change.

Computational exploration of borophane-supported single transition metal atoms as potential oxygen reduction and evolution electrocatalysts

2018 ◽  
Vol 20 (32) ◽  
pp. 21095-21104 ◽  
Author(s):  
Yashpal Singh ◽  
Seoin Back ◽  
Yousung Jung
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction ◽  
Surface Activation ◽  
Transition Metal Doping ◽  
Metal Doping ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Computational Exploration ◽  
Single Transition ◽  
Potential Oxygen

Surface activation of 2D borophane for oxygen reduction and evolution reactions is demonstrated with the help of substitutional transition metal doping.

Physical Analysis of Structural Transformation in Ge-Incorporated a-SbxSe100-x System

2011 ◽  
Vol 316-317 ◽  
pp. 45-53 ◽  
Author(s):  
Sunanda Sharda ◽  
Neha Sharma ◽  
Pankaj Sharma ◽  
Vineet Sharma
Keyword(s):  
Structural Transformation ◽  
Chalcogenide Glasses ◽  
Theoretical Study ◽  
Far Infrared ◽  
Structural Transformations ◽  
Physical Parameters ◽  
Physical Analysis ◽  
Melt Quenching ◽  
Structural Environment ◽  
Rigidity Percolation

Chalcogenide glasses are suitable for far-infrared and imaging applications. In the present study, Sb10Se90-xGex (x=0, 19, 21, 23, 25, 27) system has been chosen to study structural transformations via physical parameters. Bulk samples with x = 0, 19, 21, 23, 25 and 27 have been prepared using the melt-quenching technique. A theoretical study of the ternary glass system revealed that there was a significant change in the structural environment of the system due to rigidity percolation, which took place as Se was replaced by Ge, and hence resulted in changes in other physical parameters of the system.

Fullerene-like boron clusters stabilized by an endohedrally doped iron atom: BnFe with n = 14, 16, 18 and 20

2015 ◽  
Vol 17 (5) ◽  
pp. 3000-3003 ◽  
Author(s):  
Nguyen Minh Tam ◽  
Hung Tan Pham ◽  
Long Van Duong ◽  
My Phuong Pham-Ho ◽  
Minh Tho Nguyen
Keyword(s):  
Transition Metal ◽  
Iron Atom ◽  
Boron Clusters ◽  
Metal Atoms ◽  
Transition Metal Atoms

Stabilized fullerene and tubular forms can be produced in boron clusters Bnin small sizes fromn∼ 14 to 20 upon doping by transition metal atoms.

Multiple structural transformations coupled with switchable magnetic and dielectric responses in an amphidynamic crystal of 4′-tert-butylbenzylpyridinium bis(maleonitriledithiolate)nickelate

2015 ◽  
Vol 3 (30) ◽  
pp. 7906-7915 ◽  
Author(s):  
Wei-Hua Ning ◽  
Lu Zhai ◽  
Jian-Lan Liu ◽  
Xiao-Ming Ren ◽  
Katsuya Ichihashi ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Structural Transformation ◽  
Magnetic Phase ◽  
Structural Transformations ◽  
Magnetic Phase Transitions

An amphidynamic crystal shows a two-step structural transformation; the steps are coupled to both hysteretic magnetic phase transitions and dielectric anomalies.

Adsorption of metal atoms on silicene: stability and quantum capacitance of silicene-based electrode materials

2019 ◽  
Vol 21 (8) ◽  
pp. 4276-4285 ◽  
Author(s):  
Q. Xu ◽  
G. M. Yang ◽  
Xiaofeng Fan ◽  
W. T. Zheng
Keyword(s):  
Electrode Materials ◽  
Quantum Capacitance ◽  
Metal Doping ◽  
Vacancy Complex ◽  
Metal Atoms ◽  
Metal Vacancy

Metal-doping with the formation of a metal–vacancy complex results in an obvious increase of silicene's quantum capacitance.

Inclusion of cyclodextrins in a metallosupramolecular framework via structural transformations

CrystEngComm ◽  
2021 ◽  
Author(s):  
Supattra Somsri ◽  
Naoto Kuwamura ◽  
Tatsuhiro Kojima ◽  
Nobuto Yoshinari ◽  
Apinpus Rujiwatra ◽  
...  
Keyword(s):  
Structural Transformation ◽  
Structural Transformations ◽  
Porous Framework ◽  
Site Selective ◽  
Complex Anions

A 3D porous framework composed of D-penicillaminato AuI3CoIII2 complex anions and aqua sodium(I) cations underwent a solvent-mediated structural transformation to generate a multilayer framework, including α-CD as cyclic trimers. Site-selective...

Clay Structural Transformations during Firing

2010 ◽  
Vol 68 ◽  
pp. 31-37 ◽  
Author(s):  
Philippe Blanchart ◽  
Sarah Deniel ◽  
Nicolas Tessier-Doyen
Keyword(s):  
High Temperature ◽  
Structural Transformation ◽  
Structural Characteristics ◽  
Structural Transformations ◽  
Complex Relationship ◽  
Minor Elements ◽  
Composite Microstructure ◽  
And Behavior ◽  
High Temperature Form ◽  
Mineral Type

Silicate ceramics with clays are some of the most complicated ceramic systems because of the very complex relationship between the behavior of mineral materials during the ceramic processing and the transformations during heating. A major challenge is to predict the phase transformations in silicate ceramics, since complex relationship occur between the microstructural and structural characteristics of fired product and the physical properties. Clay minerals undergo strong structural transformations during heating, simultaneously to a complex path of thermal transformations. Individual reactions cannot simply identify since they are closely related and overlapped. At temperature above 800°C, new phases are recrystallized and many of the reactions are strongly topotactic. Mullite is the most important phase, which recrystallizes with a range of morphology and stoichiometry. Variables affecting the mullite formation include the clay mineral type and behavior during heating, the possible occurrence of liquid and impurities as Fe. It results in large variations of the stoichiometry and shape of mullite crystals, which are embedded in a low ordered phase to form a micro-composite microstructure. This presentation will review recent research, looking at structural transformations in some typically used phyllosilicate systems : (i) structural transformation of kaolinite and mica phases were identified at temperature up to 1100°C. They evidence a residual structural order of high temperature phases which is favorable to the topotactic recrystallization of mullite; (ii) from the high temperature form of phyllosilicates, an organized network of mullite can be obtained; (iii) the composition of a local and transient liquid and the presence of minor elements as Fe has a significant influence on the mullite morphology; (iv) mechanical properties are closely related to size and organization degree of the mullite network; (v) the process itself influence the kinetic of structural transformation and particularly the powder compact density and the thermal cycle. These research in silicate ceramics evidence multiple and complex challenges, providing opportunities for future development.

New hybrid organic-zincophosphate frameworks: single-crystal-to-single-crystal structural transformation and remarkable thermal and chemical stabilities

2016 ◽  
Vol 45 (17) ◽  
pp. 7231-7234 ◽  
Author(s):  
Tsung-Yuan Chang ◽  
Zhao-Nan Yan ◽  
Chun-Chi Wang ◽  
Hsing-Chun Li ◽  
Hsiu-Mei Lin ◽  
...  
Keyword(s):  
Single Crystal ◽  
Structural Transformation ◽  
Structural Transformations ◽  
Metal Phosphates ◽  
Crystal Structural

This research is the first example of hybrid metal phosphates that undergo SCSC structural transformations and exhibit remarkable thermal and chemical stabilities.

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