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Unformatted text preview: Semiconductors = n i q(mu n + mu p ) only for intrinsic semiconductors extrinsic column V n-type column III p-type = nqu Diffusion to permeate dopants Ficks second law to find n Assuming complete ionization Stress and strain Stress - = F/A o strain - = l l o /l o = dl/l o F vs dl looks like stress strain Slope = modulus of elasticity = stress/strain = / GPa = 10 3 MPa Specific strength UTMS/density Fracture toughness K IC = Y sqrt(pi*a) Surface crack is 1a Diffusion Error function problem D = D o e-Q/RT NO LEVER LAW Phase change question Phase diagrams...
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- Spring '07