At what temperature will the diffusion coefficient for the diffusion of species a in metal b
Answers
Answer:
The diffusion coefficients for species A in metal B are given at two temperatures:
T (C) D (m^2/s)
1030 6.38E-17
1290 6.26E-16
(a) Determine the value of the activation energy Qd (in J/mol)
(b) Determine the value of D0
(c) What is the magnitude of D at 1190°C
Diffusivity:
Diffusivity of a material is directly proportional to its diffusion coefficient. It means that a higher diffusion coefficient results to a higher diffusivity. The diffusion coefficient D is related to the activation energy
Q
d
by the given formula:
D
=
D
0
e
−
Q
−
d
/
(
R
T
)
where:
T is the temperature at which diffusion between the species takes place.
Answer and Explanation:
(a) the value of the activation energy
Q
d
:
Diffusion coefficient:
{eq}D=D_{0} e^{-Q_d /(R T)}\\ \ln{D}_{1}=\ln...
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