Influence of oxygen adsorption and diffusion on the overlapping of intergranular potential barriers in SnO2 thick films

2004 ◽  
Vol 111 (1) ◽  
pp. 14-19 ◽  
Author(s):  
M.A Ponce ◽  
M.S Castro ◽  
C.M Aldao
Keyword(s):  
Thick Films ◽  
Oxygen Adsorption ◽  
Potential Barriers ◽  
And Diffusion

Control of electron tunnelling by fine band engineering of semiconductor potential barriers

Nanoscale ◽  
2019 ◽  
Vol 11 (44) ◽  
pp. 21376-21385 ◽  
Author(s):  
Yunhao Zhao ◽  
Chenyuan Cai ◽  
Yi Zhang ◽  
Xuebing Zhao ◽  
Yingqiang Xu ◽  
...  
Keyword(s):  
Potential Barriers ◽  
Band Engineering ◽  
Electron Tunnelling ◽  
And Diffusion

Elementary segregation and diffusion could be utilized in band engineering to modulate potential barriers for the control of electron tunnelling.

Molecular Simulation of Oxygen Adsorption and Diffusion in Polypropylene

2009 ◽  
Vol 25 (07) ◽  
pp. 1373-1378 ◽  
Author(s):  
TAO Chang-Gui ◽  
◽  
◽  
FENG Hai-Jun ◽  
ZHOU Jian ◽  
...  
Keyword(s):  
Molecular Simulation ◽  
Oxygen Adsorption ◽  
And Diffusion

First-principles study of oxygen adsorption and diffusion on the UN(001) surface

2015 ◽  
Vol 90 (12) ◽  
pp. 125801
Author(s):  
J L Nie ◽  
L Ao ◽  
X T Zu ◽  
H Huang ◽  
K Z Liu
Keyword(s):  
First Principles ◽  
Oxygen Adsorption ◽  
First Principles Study ◽  
And Diffusion

Oxygen Adsorption and Diffusion on NiTi Alloy (100) Surface: A Theoretical Study

2012 ◽  
Vol 116 (41) ◽  
pp. 21771-21779 ◽  
Author(s):  
Xin Liu ◽  
Huimin Guo ◽  
Changgong Meng
Keyword(s):  
Theoretical Study ◽  
Niti Alloy ◽  
Oxygen Adsorption ◽  
And Diffusion

scholarly journals Determination of oxygen adsorption–desorption rates and diffusion rate coefficients in perovskites at different oxygen partial pressures by a microkinetic approach

2015 ◽  
Vol 17 (2) ◽  
pp. 1469-1481 ◽  
Author(s):  
M. Rochoux ◽  
Y. Guo ◽  
Y. Schuurman ◽  
D. Farrusseng
Keyword(s):  
Diffusion Rate ◽  
Oxygen Adsorption ◽  
Rate Coefficients ◽  
Surface Exchange ◽  
Diffusion Parameters ◽  
Partial Pressures ◽  
Adsorption Desorption ◽  
And Diffusion ◽  
Oxygen Surface Exchange

We show a generic method for the measurement of oxygen surface exchange and diffusion parameters from powders allowing the prediction of oxygen flux in membrane configuration.

Oxygen adsorption and diffusion on γ-U(0 0 1) surface: Effect of titanium

2018 ◽  
Vol 144 ◽  
pp. 85-91 ◽  
Author(s):  
Guangdong Liu ◽  
Zhixiao Liu ◽  
Bingyun Ao ◽  
Wangyu Hu ◽  
Huiqiu Deng
Keyword(s):  
Surface Effect ◽  
Oxygen Adsorption ◽  
And Diffusion

THEORETICAL STUDY OF THE ADSORPTION AND DIFFUSION OF OXYGEN ATOM ON O-TERMINATED ZnO$(000\bar 1)$ SURFACE

NANO ◽  
2014 ◽  
Vol 09 (01) ◽  
pp. 1450006 ◽  
Author(s):  
LIANG QIAO ◽  
YI ZENG ◽  
CHAOQUN QU ◽  
XIAOYING HU ◽  
LIJUN SONG ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Density Functional ◽  
Theoretical Study ◽  
Adsorbed Oxygen ◽  
Surface Relaxation ◽  
Functional Theory ◽  
Potential Barriers ◽  
Surface Work ◽  
Adsorbed Oxygen Atom ◽  
And Diffusion

The adsorption and diffusion of oxygen atom on the O -terminated ZnO [Formula: see text] surface have been systematically investigated based on first-principles density functional theory. The results show that the surface relaxation of the ZnO [Formula: see text] surface is significant. In the view of the maximization of the adsorption energy, the preferred site for the adsorption of oxygen atom is the top- O site above the oxygen atom of the first Zn – O bilayer. There is chemical bond formed between the adsorbed oxygen atom and the oxygen atom on the surface, which will result in the redistribution of the charges. The charges transfer from the ZnO surface to the adsorbed oxygen atom, which will heighten the surface potential of ZnO surface and increase the surface work function. Moreover, the diffusion of the oxygen atom on the ZnO surface has also been investigated, and the potential barriers of the diffusion have been identified to reveal the adsorption stability.

Effects of Sintering Temperature on the Barium Hexaferrite Thick Films Prepared by Screen Printing Method

2011 ◽  
Vol 687 ◽  
pp. 51-54
Author(s):  
Zhao Lin Huang ◽  
Bin Peng ◽  
Ke Tan ◽  
Wen Xu Zhang ◽  
Wan Li Zhang
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Screen Printing ◽  
Sintering Temperature ◽  
Thick Films ◽  
Barium Hexaferrite ◽  
Ferromagnetic Phase ◽  
Screen Printing Method ◽  
And Diffusion ◽  
Printing Method

In this paper, barium hexaferrite thick films with thickness of 80 microns were prepared on alumina substrates by screen printing method for applications in self-biased planar microwave devices. The influences of sintering temperature on the microstructures and magnetic properties of barium ferrite (BaM) thick films were investigated. The results show that with the increase of sintering temperature, the grain size increases and the porosity of the BaM thick films decreases. When the sintering temperature is below 1200 °C, the BaM thick films show magnetic properties with coercive force of about 3.5 kOe and magnetization at 20 KOe (4πM20kOe) of about 1750 Gs. When the sintering temperature is greater than 1200 °C, the magnetic properties deteriorate remarkably and exhibit a coercive force of 0.4 kOe and 4πM20kOe of about 480 Gs due to the over-sintering and diffusion of Al atoms into the BaM thick films. A new non-ferromagnetic phase Al13Ba7 is formed, which is detected by XRD.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

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