The effect of electronic energy loss on irradiation-induced grain growth in nanocrystalline oxides

2014 ◽  
Vol 16 (17) ◽  
pp. 8051-8059 ◽  
Author(s):  
Yanwen Zhang ◽  
Dilpuneet S. Aidhy ◽  
Tamas Varga ◽  
Sandra Moll ◽  
Philip D. Edmondson ◽  
...  
Keyword(s):  
Energy Loss ◽  
Grain Growth ◽  
Growth Mechanism ◽  
Nanocrystalline Materials ◽  
Electronic Energy ◽  
Grain Sizes ◽  
Nanocrystalline Oxides

The unraveling disorder-driven grain growth mechanism may be utilized to control grain sizes and tailor the functionality of nanocrystalline materials.

Microstructural development of ZnO using a rate-controlled sintering dilatometer

1996 ◽  
Vol 11 (3) ◽  
pp. 671-679 ◽  
Author(s):  
Gaurav Agarwal ◽  
Robert F. Speyer ◽  
Wesley S. Hackenberger
Keyword(s):  
Thermal Expansion ◽  
Heating Rate ◽  
Grain Growth ◽  
Microstructural Development ◽  
Constant Heating Rate ◽  
Temperature Determination ◽  
Grain Sizes ◽  
Rate Controlled ◽  
Temperature Controlled ◽  
Constant Heating

Rate-controlled sintering (RCS) of isostatically pressed particulate compacts of ZnO showed lower average grain sizes and intragranular pore densities than constant heating rate temperature controlled sintering. Valid comparisons of this form could only be made after corrections to hardware and software which reduced specimen creep under dilatometer pushrod load, nonuniform pushrod expansion, reproducible specimen temperature determination, thermal expansion during sintering, and instantaneous termination of sintering at the specified end of RCS. The improved microstructures from RCS were attributed to maximized efficiency of densification, optimizing the time and temperatures permitted for grain growth.

scholarly journals A coupled effect of nuclear and electronic energy loss on ion irradiation damage in lithium niobate

2016 ◽  
Vol 105 ◽  
pp. 429-437 ◽  
Author(s):  
P. Liu ◽  
Y. Zhang ◽  
H. Xue ◽  
K. Jin ◽  
M.L. Crespillo ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Energy Loss ◽  
Ion Irradiation ◽  
Electronic Energy ◽  
Irradiation Damage ◽  
Coupled Effect

Thermal Transport in Nanocrystalline Materials

2005 ◽  
Author(s):  
Zhanrong Zhong ◽  
Xinwei Wang
Keyword(s):  
Thermal Conductivity ◽  
Specific Heat ◽  
Thermal Transport ◽  
Nanocrystalline Materials ◽  
Large Scale ◽  
Md Simulation ◽  
Fundamental Physics ◽  
Grain Sizes ◽  
Simulation Results ◽  
Thermal Phenomena

In this work, thermal transport in nanocrystalline materials is studied using large-scale equilibrium molecular dynamics (MD) simulation. Nanocrystalline materials with different grain sizes are studied to explore how and to what extent the size of nanograins affects the thermal conductivity and specific heat. Substantial thermal conductivity reduction is observed and the reduction is stronger for nanocrystalline materials with smaller grains. On the other hand, the specific heat of nanocrystalline materials shows little change with the grain size. The simulation results are compared with the thermal transport in individual nanograins based on MD simulation. Further discussions are provided to explain the fundamental physics behind the observed thermal phenomena in this work.

scholarly journals Electronic energy loss of channeled ions: The giant Barkas effect

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
L. L. Araujo ◽  
P. L. Grande ◽  
M. Behar ◽  
J. F. Dias ◽  
A. F. Lifschitz ◽  
...  
Keyword(s):  
Energy Loss ◽  
Electronic Energy

scholarly journals Ice-wedge Ice, Mackenzie Delta-Tuktoyaktuk Peninsula Area, N.W.T., Canada

1978 ◽  
Vol 20 (84) ◽  
pp. 555-562 ◽  
Author(s):  
W. Alan Gell
Keyword(s):  
Stress Field ◽  
Grain Growth ◽  
Growth Mechanism ◽  
Crystal Size ◽  
Horizontal Stress ◽  
Crystal Shape ◽  
Mackenzie Delta ◽  
Ice Wedge

Abstract Petrologic analysis was performed on ice-wedge ice in order to investigate changes in fabric across wedges in relation to the growth mechanism. Crystal size increased from the centre outward and strongly preferred dimensional orientations developed parallel to the sides of wedges. c-axis orientations changed from a horizontal girdle at the wedge centre to a point maximum normal to the foliation at the boundary. These changes are related to recrystallization and grain growth associated with the horizontal stress field. In massive ice penetrated by an ice wedge, crystal size and complexity of crystal shape decreased toward the wedge, dimensional orientations tended to become parallel to the wedge, and c-axes formed a point maximum normal to the wedge boundary.

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