Sat June 30, 2012 By: Jayesh Singh Gandhi

what is the cause of defects??

Expert Reply
Sun July 01, 2012
crystals are perfect in that all unit cells consist of the ideal arrangement of atoms or molecules and all cells line up in a three dimensional space with no distortion. Some cells may have one or more atoms less whereas others may have one or more atoms than the ideal unit cell. The imperfection of crystals are called crystal defects.

Crystal defects are results of thermaldynamic equilibrium contributed also by the increase in entropy T S term of the Gibb's free energy:

DG = DH - TDS.Only at the unatainable absolute zero K will a crystal be perfect, in other words, no crystals are absolutely perfect. However, the degree of imperfection vary from compound to compound.
Fri January 20, 2017

Explain anisotropy 

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