What is a substitutional impurity defect? - Chemistry | Shaalaa.com

Which is the substitutional defect?[Image of a crystal lattic... | Filo

SOLVED:Consider a substitutional point defect located at the origin of a Cartesian coordinate system in an infinite simple cubic crystal structure with lattice constant a. The forces exerted by the defect on each of the six nearest neighbours have magnitude f, and they are directed along the bonds. Show that the displacement field ui(𝐱) at 𝐱 is approximately -2 a f Gi j, j(𝐱), and state the nature of the approximation. Show that in the isotropic elastic approximation: ui(𝐱)=((1-2 v) a f)/(4