Exercise 2.2-1

Properties of Johnson Complexes

Discuss the equation for the concentration of vacancy - impurity atom complexes (Johnson complexes).
Consider an impurity atom concentration of 1 % and 1 ppm, a vacancy formation enthalpy of 1 eV (neglect the formation entropy) and several binding energies (including extremes).
Discuss the concentration of Johnson complexes as a function of temperature and in relation to the concentration of the impurity atoms and the equilibrium concentration of vacancies.
Use approximations, order-of- magnitude considerations and reasonable numbers whenever possible.
     
 
 

Link to the Solution

 

To index To index as PDF

go to 2.2.1 Extrinsic Point Defects and Agglomerates

go to Solution to Exercise 2.2-1

© H. Föll (Defects - Script)