Photoemission evidence of electronic stabilization of polar surfaces inK3C60

2000 ◽  
Vol 62 (23) ◽  
pp. 16046-16055 ◽  
Author(s):  
R. Hesper ◽  
L. H. Tjeng ◽  
A. Heeres ◽  
G. A. Sawatzky
Keyword(s):  
Polar Surfaces ◽  
Electronic Stabilization

On the Faceting of Polar Ceramic Surfaces: Microscopy and Holography Studies of MGO(111) Surfaces

1996 ◽  
Vol 54 ◽  
pp. 366-367
Author(s):  
M. Gajdardziska-Josifovska ◽  
B. G. Frost ◽  
E. Völkl ◽  
L. F. Allard
Keyword(s):  
Electron Microscopy ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Electron Holography ◽  
Flat Surfaces ◽  
Transmission Electron ◽  
Excess Surface ◽  
Polar Surfaces ◽  
Salt Structure ◽  
Crystallographic Planes

Polar surfaces are those crystallographic faces of ionically bonded solids which, when bulk terminated, have excess surface charge and a non-zero dipole moment perpendicular to the surface. In the case of crystals with a rock salt structure, {111} faces are the exemplary polar surfaces. It is commonly believed that such polar surfaces facet into neutral crystallographic planes to minimize their surface energy. This assumption is based on the seminal work of Henrich which has shown faceting of the MgO(111) surface into {100} planes giving rise to three sided pyramids that have been observed by scanning electron microscopy. These surfaces had been prepared by mechanical polishing and phosphoric acid etching, followed by Ar+ sputtering and 1400 K annealing in ultra-high vacuum (UHV). More recent reflection electron microscopy studies of MgO(111) surfaces, annealed in the presence of oxygen at higher temperatures, have revealed relatively flat surfaces stabilized by an oxygen rich reconstruction. In this work we employ a combination of optical microscopy, transmission electron microscopy, and electron holography to further study the issue of surface faceting.

Nickel(II)-Methyl Complexes Adopting Idealized Seesaw Geometries

2019 ◽  
Author(s):  
Ethan A. Hill ◽  
Norman Zhao ◽  
Alexander S. Filatov ◽  
John Anderson
Keyword(s):  
Singlet State ◽  
Strong Field ◽  
Structural Distortion ◽  
Computational Results ◽  
Threefold Symmetry ◽  
Chelating Ligand ◽  
Electronic Stabilization

We report four-coordinate nickel(II)-methyl complexes of tris-carbene borate ligands which adopt rare seesaw geometries. Experimental and computational results suggest the structural distortion from threefold symmetry results from a combination of electronic stabilization of the singlet state, strong field donors, and constrained angles from the chelating ligand.

Interface coupling and charge doping in graphene on ferroelectric BiAlO3(0001) polar surfaces

2021 ◽  
Vol 23 (5) ◽  
pp. 3407-3416
Author(s):  
Jin Yuan ◽  
Jian-Qing Dai ◽  
Cheng Ke ◽  
Zi-Cheng Wei
Keyword(s):  
Dft Calculations ◽  
Hybrid System ◽  
First Principles ◽  
Doping Effect ◽  
Coupling Mechanism ◽  
Polarization Reversal ◽  
Interface Coupling ◽  
Polar Surfaces ◽  
Charge Doping

The interface coupling mechanism, charge doping effect, and effect of polarization reversal in the graphene/BiAlO3(0001) hybrid system are explored by first-principles DFT calculations.

Stability and photoelectric nature of polar surfaces of ZnO: Effects of surface reconstruction

2021 ◽  
Vol 398 ◽  
pp. 127274
Author(s):  
Qinggao Wang ◽  
Jianwen Zhang ◽  
Chongping Song
Keyword(s):  
Surface Reconstruction ◽  
Polar Surfaces

Nitrogen Ion Behavior on Polar Surfaces of ZnO Single Crystals

2003 ◽  
Vol 42 (Part 1, No. 1) ◽  
pp. 75-77 ◽  
Author(s):  
Hideyuki Maki ◽  
Isao Sakaguchi ◽  
Naoki Ohashi ◽  
Shoichi Sekiguchi ◽  
Hajime Haneda ◽  
...  
Keyword(s):  
Single Crystals ◽  
Polar Surfaces ◽  
Nitrogen Ion

Cluster models for the interaction of HC1 with non-polar surfaces of γ-Al2O3

1993 ◽  
Vol 286 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Marina Lindblad ◽  
Pakkanen Tapani A.
Keyword(s):  
Cluster Models ◽  
Polar Surfaces

LEED Study on the Polar Surfaces of ZnO

1972 ◽  
pp. 361-368
Author(s):  
H. Van Hove ◽  
R Leysen
Keyword(s):  
Polar Surfaces

Low interface state densities at Al2O3/GaN interfaces formed on vicinal polar and non-polar surfaces

2020 ◽  
Vol 117 (10) ◽  
pp. 102102 ◽  
Author(s):  
Yuto Ando ◽  
Kentaro Nagamatsu ◽  
Manato Deki ◽  
Noriyuki Taoka ◽  
Atsushi Tanaka ◽  
...  
Keyword(s):  
Interface State ◽  
Polar Surfaces ◽  
State Densities
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