Question

Consider the high temperature diffusion of Arsenic at 1619°C for 290 hours into a semi-infinite solid cylinder of pure silicon having a radius R=810 E-6 m. Assume values of Do = 0.218 cm2/s, Q = 332.2 kJ/mole, R = 8.314 J/mole-K and a surface concentration 6E18 atoms/cm3. Determine the concentration at the ten (10) equally spaced distances from the surface listed below.

a)         C_x(@x₀=0.0∙R) = C_x0=   ___6E+18_________ C@surface                 

b)         C_x(@x₁=0.1∙R) = C_x1=   _________________

c)         C_x(@x₂=0.2∙R) = C_x2=   _________________             

d)         C_x(@x₃=0.3∙R) = C_x3=   _________________

e)         C_x(@x₄=0.4∙R) = C_x4=   _________________             

f)         C_x(@x₅=0.5∙R) = C_x5=   _________________

g)         C_x(@x₆=0.6∙R) = C_x6=   _________________             

h)         C_x(@x₇=0.7∙R) = C_x7=   _________________

i)         C_x(@x₈=0.8∙R) = C_x8=   _________________             

j)         C_x(@x₉=0.9∙R) = C_x9=   _________________

k)         C_x(@x₁₀=1.0∙R) = C_x10= _________________

Answer 1