In: Chemistry
Find the Kroger-Vink notations for point defects (Vacancies, Interstitials, Anti-site Defect) with appropriate charges for CsCl crystal. By using the Kroger-Vink notation, list a Schottky defect pair and a Frenkel defect pair for CsCl.
Kröger-Vink Notation:
X – nature of species located on a site: element symbol for an atom, V for vacancy
Y – type of the site occupied by X: (i for an interstitial, element symbol for site normally occupied by this element)
Z – charge relative to the normal ion charge on the site ′ negative relative charge • positive relative charge x zero relative charge (x is often omitted)
For CsCl it can be given as
Vaccancy on a Cs site in CsCl :V'Cs
interstitial Cs ion in CsCl: Csi.
Frenkel defect pair in CsCl: CsxCs-->Csi. + V'Cs
Schottky defect pair in CsCl : CsxCs+ClxCl -->V'Cs + V'Cl+ CsxCs+ClxCl