what are the imperfections found in solid materilsdescribe t

what are the imperfections found in solid materils??describe them

Go through this link you can have detail explanation

https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjFpYf70o3MAhUHkpQKHavUBz8QFgglMAE&url=http%3A%2F%2Fresearch.che.tamu.edu%2Fgroups%2FSeminario%2Fnanotechnology%2FMaterials%2520chapters%2Fch05-Imperfections.pdf&usg=AFQjCNFU3c8_6A0LloytcpZqC8V1DOoPQA