Answer to Question #118760 in Inorganic Chemistry for Yuki

Question #118760
Explain why all crystals contain defects at temperatures above 0 K. Draw a diagram which
shows how the free energy, enthalpy and entropy of a crystal change on the introduction
of defects into the structure.
1
Expert's answer
2020-05-28T13:22:22-0400

The creation of single, unassociated point defects in an elemental, crystalline solid increases the internal energy of the system and the enthalpy of the defect formation is positive. But the configurational entropy of the system also increases, and the equilibrium concentration of the defects will be reached when the Gibbse energyof the system is at minimum. Thermodynamically, point defects will thus always be present in a crystal above 0 K. 


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