Statistical nature of impurity-atom diffusion and its influence on the characteristics of narrow-base bipolar transistors

1972 ◽  
Vol 8 (7) ◽  
pp. 173 ◽  
Author(s):  
D.P. Kennedy ◽  
R.R. O'Brien
Keyword(s):  
Impurity Atom ◽  
Bipolar Transistors ◽  
Statistical Nature ◽  
Atom Diffusion ◽  
Narrow Base

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.

DC characteristics of pnp AlGaAs/GaAs narrow-base heterojunction bipolar transistors

1989 ◽  
Vol 25 (20) ◽  
pp. 1396 ◽  
Author(s):  
L.L. Liou ◽  
A. Ezis ◽  
K. Ikossi-Anastasiou ◽  
K.R. Evans ◽  
C.E. Stutz ◽  
...  
Keyword(s):  
Heterojunction Bipolar Transistors ◽  
Bipolar Transistors ◽  
Dc Characteristics ◽  
Narrow Base

Diffusive base transport in narrow base InP/Ga0.47In0.53As heterojunction bipolar transistors

1991 ◽  
Vol 59 (26) ◽  
pp. 3431-3433 ◽  
Author(s):  
D. Ritter ◽  
R. A. Hamm ◽  
A. Feygenson ◽  
M. B. Panish ◽  
S. Chandrasekhar
Keyword(s):  
Heterojunction Bipolar Transistors ◽  
Bipolar Transistors ◽  
Narrow Base
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