
(a)
Interpretation:
Activation energy is to be calculated.
Concept Introduction:
To calculate the activation energy for the diffusion coefficient at temperature
Here,

Answer to Problem 5.23P
The activation energy is
Explanation of Solution
Calculate the equation for the diffusion coefficient at temperature
Here,
Substitute
Convert the temperature is in Celsius to Kelvin scale or the absolute temperature scale as follows.
Here, temperature in Kelvin is
Substitute
Arrhenius equation uses the value of absolute temperature.
Hence
Substitute the above value in equaion
Calculate the equation for the diffusion coefficient at temperature
Here,
Substitute
Convert the temperature is in Celsius to Kelvin scale or the absolute temperature scale as follows.
Here, temperature in Kelvin is
Substitute
Arrhenius equation uses the value of absolute temperature.
Hence
Substitute the above value in equaion
Calculate the activation energy.
Divide equaiton
Therefore, the activation energy is
(b)
Interpretation:
The constant
Concept Introduction:
Calculate the value of constant
Substitute the value of the activation energy

Answer to Problem 5.23P
The constant
Explanation of Solution
Calculate the value of constant
Substitute the value of the activation energy
Substitute
Hence, the constant
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Chapter 5 Solutions
Essentials of Materials Science and Engineering, SI Edition
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