Formation Mechanism of F-Centers in KCl Single Crystal Heated in Potassium Vapor

Nowadays, the nano-machining process is used to produce high quality finished surfaces with precise form accuracy. To understand and analyze the chip formation mechanism of nano-machining process on an atomistic scale, since the experimentation is not an easy task, numerical simulation such as molecular dynamic (MD) simulation is a very useful method. In this paper, MD simulation of the nano-metric cutting of single-crystal copper was performed with a single crystal diamond tool. The model was solved with both pair wise Morse potential function and embedded atom method (EAM) potential to simulate the inter-atomic force between the work-piece and a rigid tool. The chip formation mechanism, dislocation generation, tool forces and generated temperature were investigated. Results show that the Morse potential cannot perform an appropriate defect formation and plastic deformation in nano-metric cutting of metals. Also, tool forces in Morse potential are more than the forces in EAM potential. Furthermore, the fluctuations of resultant forces in Morse potential are greater than that of EAM. In addition, using many-body interaction potentials like EAM can lead to substantial changes in surface energies, elastic-plastic properties and atomic displacement, compared with the pair-wise potentials like Morse. Finally, the atomic displacement investigation shows that in EAM potential study, only the atoms in a local region near the cutting process are displaced, but in Morse potential a large portion of atoms has affected during cutting process. Subsequently, the chip temperature in EAM potential is more than that of Morse potential.

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Single-Crystal MgO Hollow Nanospheres Formed in RF Impulse Discharge Plasmas

Journal of Nanomaterials ◽

10.1155/2012/691874 ◽

2012 ◽

Vol 2012 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Satoru Iizuka ◽

Takumasa Muraoka

Keyword(s):

Radio Frequency ◽

Single Crystal ◽

Formation Mechanism ◽

Hollow Nanospheres ◽

Mgo Nanoparticles ◽

Impulse Discharge ◽

Discharge Plasmas ◽

Cooling Model

Spherical MgO nanoparticles with a hollow inside, that is, MgO hollow nanospheres, were created in Ar/O2plasma produced by radio frequency (RF) impulse discharge using a Mg rod electrode. The hollow nanospheres were found on the SiO2plates placed near the powered Mg electrode. The electron refraction pattern showed that each nanosphere was made of a single crystal of MgO. Since the shape was spherical, these nanoparticles seemed to be created during the levitation in the plasma without touching any walls. The formation mechanism with a quasiliquid cooling model was also discussed.

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Synthetic and formation mechanism of Cu6Sn5 single-crystal layer on Cu pad for UBM application

2013 14th International Conference on Electronic Packaging Technology ◽

10.1109/icept.2013.6756486 ◽

2013 ◽

Author(s):

Zhihao Zhang ◽

Huijun Cao ◽

Mingyu Li

Keyword(s):

Single Crystal ◽

Formation Mechanism ◽

Crystal Layer ◽

Single Crystal Layer

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Controllable synthesis and formation mechanism of single-crystal β-Co(OH)2 microrings as sensors for detection of nitrite ions

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2017.03.005 ◽

2017 ◽

Vol 193 ◽

pp. 371-379 ◽

Cited By ~ 6

Author(s):

Cui Tingting ◽

Yanting Zhao ◽

Yao Qian ◽

Yali Shao ◽

Mengting Fan ◽

...

Keyword(s):

Single Crystal ◽

Formation Mechanism ◽

Controllable Synthesis

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The hydrothermal synthesis and formation mechanism of single-crystalline perovskite BiFeO3 microplates with dominant (012) facets

CrystEngComm ◽

10.1039/c3ce42488j ◽

2014 ◽

Vol 16 (20) ◽

pp. 4176-4182 ◽

Cited By ~ 27

Author(s):

Xin Yang ◽

Gang Xu ◽

Zhaohui Ren ◽

Xiao Wei ◽

Chunying Chao ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Single Crystal ◽

Hydrothermal Method ◽

Formation Mechanism ◽

Organic Ligands ◽

Adsorption Behaviour ◽

One Pot ◽

Single Crystalline

Single-crystal BiFeO3 (BFO) microplates with dominant (012) facets were successfully synthesized by a facile one-pot hydrothermal method. The adsorption behaviour of the organic ligands may play a key role in the formation of the BFO microplates.

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Single crystal ellipsoidal and spherical particles of α-Fe2O3: Hydrothermal synthesis, formation mechanism, and magnetic properties

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2013.05.215 ◽

2013 ◽

Vol 577 ◽

pp. 402-408 ◽

Cited By ~ 12

Author(s):

Hua Jiao ◽

Junlong Wang

Keyword(s):

Magnetic Properties ◽

Hydrothermal Synthesis ◽

Single Crystal ◽

Formation Mechanism ◽

Spherical Particles

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Hydrothermal synthesis, characterization, formation mechanism and electrochemical property of V3O7·H2O single-crystal nanobelts

Materials Science and Engineering B ◽

10.1016/j.mseb.2010.07.023 ◽

2010 ◽

Vol 175 (2) ◽

pp. 164-171 ◽

Cited By ~ 66

Author(s):

Yifu Zhang ◽

Xinghai Liu ◽

Guangyong Xie ◽

Lei Yu ◽

Shengping Yi ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Single Crystal ◽

Formation Mechanism ◽

Electrochemical Property

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Formation Mechanism of Strip Defects in Anodizing AA5252 Aluminium Alloy Sheets

MATEC Web of Conferences ◽

10.1051/matecconf/202032604003 ◽

2020 ◽

Vol 326 ◽

pp. 04003

Author(s):

Chong Gao ◽

Zhongyu Jiang ◽

Zhenshan Liu ◽

Pizhi Zhao ◽

Ruiyin Huang ◽

...

Keyword(s):

Surface Layer ◽

Sulfuric Acid ◽

Single Crystal ◽

Aluminium Alloy ◽

Formation Mechanism ◽

Grain Orientation ◽

Surface Brightness ◽

Aluminium Substrate ◽

Normal Zone ◽

Lower Porosity

Processed by sulfuric acid anodizing, several unexpected strip defects exhibited on the anodizing film of AA5252 aluminium alloy sheets. Their formation mechanism was studied in detail. The normal zone and strip zone were compared, with respect to surface brightness, porosity of anodizing film, and microstructures of the corresponding aluminium substrate tested by spectroscopic colorimeter and SEM, and SEM-EBSD. Results showed that the brightness of strip zone was lower than that of normal zone. Additionally, compared with normal zone, the porosity of anodizing film was higher, and cubic grains fewer, which located in the corresponding surface layer of aluminium substrate in strip zone. In order to further clarify the effect of grain orientation on the brightness of anodizing film, single crystal aluminium sheet with (100), (110) or (111) orientation was anodized. Results showed that the anodized (100) oriented specimen, i.e., cubic grain was brighter, whose anodizing film had lower porosity, compared with (110) and (111) oriented ones. Therefore, the formation mechanism of strip defects was proposed as uneven distribution of cubic grains. The zones with fewer cubic orientated grains were darker, and were visible as strip defects after anodizing.

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