Thermodynamic theory for efficiency of multiple impurity-atom doping in diamond

2005 ◽  
Vol 202 (11) ◽  
pp. 2134-2140 ◽  
Author(s):  
Takehide Miyazaki ◽  
Satoshi Yamasaki
Keyword(s):  
Impurity Atom ◽  
Thermodynamic Theory

scholarly journals Cooperativity in micellar solubilization

2021 ◽  
Vol 23 (14) ◽  
pp. 8705-8716
Author(s):  
Seishi Shimizu ◽  
Nobuyuki Matubayasi
Keyword(s):  
Thermodynamic Theory ◽  
Statistical Thermodynamic ◽  
Micellar Solubilization

Enhanced surfactant association by solutes drives cooperative solubilization according to the universal statistical thermodynamic theory.

Thermodynamic Theory of Multiresponsive Microgel Swelling

2021 ◽  
Author(s):  
Néstor A. Pérez-Chávez ◽  
Alberto G. Albesa ◽  
Gabriel S. Longo
Keyword(s):  
Thermodynamic Theory

scholarly journals Thermodynamic Theory of Weakly Excited Granular Systems

1997 ◽  
Vol 78 (14) ◽  
pp. 2764-2767 ◽  
Author(s):  
Hisao Hayakawa ◽  
Daniel C. Hong
Keyword(s):  
Thermodynamic Theory ◽  
Granular Systems

Diffusion Coefficients of Interest for the Simulation of Heat Treatment in Rare-Earth Transition Metal Magnets

2012 ◽  
Vol 727-728 ◽  
pp. 163-168 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Experimental Data ◽  
Heat Treatment ◽  
Activation Energy ◽  
Rare Earth ◽  
Transition Metal ◽  
Impurity Atom ◽  
Diffusion Coefficients ◽  
Arrhenius Equation ◽  
Atom Diffusion ◽  
Essential Input

In the case of the modeling of sintering and heat treatments, the diffusion coefficients are an essential input. However, experimental data in the literature about diffusion coefficients for rare-earth transition metal intermetallics is scarce. In this study, the available data concerning diffusion coefficients relevant for rare-earth transition metal magnets are reviewed and commented. Some empirical rules are discussed, for example the activation energy is affected by the size of the diffusing impurity atom. Diffusion coefficients for Dy, Nd and Fe into Nd2Fe14B are given according an Arrhenius equation D=D0exp (-Q/RT). For Dy diffusion into Nd2Fe14B, Q 315 kJ/mol and D08 . 10-4m2/s.

scholarly journals Impurity Diffusion in Lithium

1970 ◽  
Vol 25 (10) ◽  
pp. 1477-1483 ◽  
Author(s):  
Aadu Ott
Keyword(s):  
Thin Film ◽  
Impurity Atom ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Impurity Diffusion ◽  
Experimental Results ◽  
Vacancy Mechanism ◽  
Lithium Metal ◽  
Qualitative Explanation ◽  
Sectioning Method

Abstract The diffusion of 115mCd, 203Hg and 72Ga tracers in lithium metal has been studied, using a thin film deposition and sectioning method.The experimental results can be expressed by the following Arrhenius relations:These results, which do not agree with any established theory of impurity diffusion in a metallic lattice, are discussed together with data from previous experiments in terms of the systematics of the dependence of the diffusivity on the "ionizability" of an impurity atom in Li, and on the size of the impurity. In this way a qualitative explanation of the different diffusions rates can be obtained. The relatively large and electropositive impurities appear to diffuse mainly via a vacancy mechanism and the small and electronegative ones mainly as interstitials. The distinction substitutional-interstitial is less pronounced for very large impurities, which may also exhibit tendencies to be trapped at lattice defects.

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