Experimental Evidence for Nucleation and Growth Mechanism of Diamond by Seed-Assisted Method at High Pressure and High Temperature

2010 ◽  
Vol 10 (7) ◽  
pp. 2895-2900 ◽  
Author(s):  
Xiaobing Liu ◽  
Xiaopeng Jia ◽  
Xinkai Guo ◽  
Zhuangfei Zhang ◽  
Hong-an Ma
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Experimental Evidence ◽  
Growth Mechanism ◽  
Nucleation And Growth ◽  
Nucleation And Growth Mechanism

Kinetics of the SRO-LRO Transformation in NI4MO

1984 ◽  
Vol 39 ◽  
Author(s):  
E. E. Stansbury
Keyword(s):  
Temperature Dependence ◽  
Experimental Evidence ◽  
Growth Mechanism ◽  
Strong Evidence ◽  
Nucleation And Growth ◽  
Initial State ◽  
Theoretical Predictions ◽  
Microdomain Structure ◽  
Kinetics Of ◽  
Nucleation And Growth Mechanism

ABSTRACTThe isothermal time-temperature dependence of the transformation from SRO to LRO as measured by resistivity changes is given. Problems of defining an initial state from which the transformation occurs are reviewed with emphasis on the microdomain structure from which the LRO structure develops. Questions of homogeneous transformation relative to heterogeneous transformation by clear nucleation and growth are addressed in terms of experimental evidence and theoretical predictions. Strong evidence for a nucleation and growth mechanism, at least above 750° C, is presented.

Formation of coherent twins in YBa2Cu3O7–δ superconductors

1989 ◽  
Vol 4 (4) ◽  
pp. 795-801 ◽  
Author(s):  
C. J. Jou ◽  
J. Washburn
Keyword(s):  
Oxygen Uptake ◽  
Growth Mechanism ◽  
Oxygen Uptake Rate ◽  
Nucleation And Growth ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Twin Formation ◽  
Boundary Model ◽  
Nucleation And Growth Mechanism

A nucleation-and-growth mechanism for the twin formation in YBa2Cu3O7–δ superconductors based on the oxygen uptake rate curve and published transmission electron microscopic observations is proposed together with an oxygen-depleted twin boundary model. The difficulty of reaching stoichiometric YBa2Cu3O7 is explained.

scholarly journals Nucleation/Growth and Optical Proprieties of Co-doped ZnO Electrodeposited on ITO Substrate

2021 ◽  
Vol 12 (5) ◽  
pp. 6776-6787
Keyword(s):  
Cyclic Voltammetry ◽  
Growth Mechanism ◽  
Supporting Electrolyte ◽  
Saturated Calomel Electrode ◽  
Nucleation And Growth ◽  
Visible Range ◽  
Zno Films ◽  
Doped Zno ◽  
Nucleation And Growth Mechanism ◽  
Co Doped

A Co-doped ZnO layer was prepared by electrodeposition method on indium doped tin oxide (ITO) substrate using a cathodic reduction from nitrate medium with different doping percentages of cobalt. The bath temperature was controlled at 70 °C. The films were cathodically electrodeposited in a bath containing 5 mM Zn(NO3)2. 6H2O, while the source of Co is Co(NO3)2.6H2O where 0.1M KNO3 was used as supporting electrolyte. The nucleation and growth mechanism of Co-doped ZnO nuclei have been studied by cyclic voltammetry and chronoamperometry. The cyclic voltammetry shows that the electrodeposition of ZnO and Co-doped ZnO at a negative potential around -1.0 V versus saturated calomel electrode (SCE) is a quasi-reversible reaction controlled by the diffusion process. Comparing current transients curves obtained by the chronoamperometric method with the theoretical curves of current density j versus t ½ allows us to say that the nucleation is 3D instantaneous, as shown in SEM analysis. The presence of Co does not modify the nucleation and growth mechanism. The XRD patterns show that the substitution of zinc by cobalt does not change the würtzite crystal structure, but the crystallite size decreases with the cobalt percentage. The transmittance spectra indicate that the Co-doped ZnO films are transparent in the visible range. The optical gap increases with the doping percentage of cobalt.

Study of Nucleation and Growth Mechanism of the Metallic Nanodumbbells

2012 ◽  
Vol 134 (9) ◽  
pp. 4384-4392 ◽  
Author(s):  
Galyna Krylova ◽  
Lisandro J. Giovanetti ◽  
Felix G. Requejo ◽  
Nada M. Dimitrijevic ◽  
Alesia Prakapenka ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Nucleation And Growth ◽  
Nucleation And Growth Mechanism
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