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1).schottky defect arises due to departue of ions (both cation and anion in equal ratio) from crystal lattice leaving holes that favour conductivity. The equal no of ions depart because to maintain the electrical neutrality of crystal. It was discovered by walter.H schottky in 1930.
But in frenkel defect ions(cations) are missing from there normal lattice site and occupying an interstitial site between the lattice points. They dont depart from crystal lattice. Because no departure occure so crystal remain electrically neutral. It was discovered by Yakov frenkel in 1926.
2) schottky defect is only vacancy defect but frenkel defect is vacancy as well as interstitial defect.
3). Schottky defect decreases density and strength of the crystal. But frenkel defect doesnt affect density.
4).schottky defect is shown by the ionic solids having high coordination no and approx. same size of cation and anion(i.e r+ve/r-ve approaches to 1)
While frenkel defect is shown by the compound having low coordination no and size of anion larger than cation(i.e r+ve/r-ve approches the minimum value).
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Sandeep Singh Lingwal
Srinagar, Uttrakhand
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∙ 12y ago
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