# Formation Enthalpies and Entropies for Frenkel and Schottky Defects

| The following table contains some numbers found in the literature. It is not complete, eventually it might get "fuller".
|  | Schottky Disorder
Crystal | HF [eV] | SF [k] | HM Cation vacancy [eV] | HM Anion vacancy [eV]
LiF | 2.5 1) 2.342), 3) | 9.61) | 0.71) | 0.71)
LiCl | 2.122), 3) |  |  |
LiBr | 1.83) |  |  |
LiI | 1,33) |  |  |
NaCl | 2.31), 2), 3) | 61) | 0.71) | 1.01)
KCl | 2.31) 2.263) | 6.51) | 0.71) | 1.01)
KBr | 2.41) | 8.61) | 0.61) | 0.91)
CsI | 1.91) | - | 0.61) | 0.31)
MgO | 6.62) |  |  |
CaO | 6.1 |  |  |
|  | Frenkel Disorder
| HF [eV] | SF [k] | Hm Anion interstitial [eV] | HM Anion vacancy [eV]
AgCl | 1.62), 3) |  |  |
AgBr | 1,203) |  |  |
b - AgI | 0,73) |  |  |
CaF2 | 2.71) 2.82), 3) | - | » 1.01) | 0.61)
SrF2 | 2.31) 0.73) | - | 0.81) | 0.91)
BaF2 | 1.91) | - | 0.71) | 0.61)
PbF2 | 1.11) | - | - | -
SrCl2 | 1.71) | - | - | -
ZrO2 | 4.12) |  |  |
UO2 | 3.42) |  |  |
|  | 1) From "Hayes and Stoneham"; Defects an Defect Processes in Nonmetallic Solids
|  | 2) From University of Hull, Lectures
|  | 3) From Uni Lethbridge; California.

With frame

2.1.2 Frenkel Defects

2.1.4 Mixed Point defects

Exercise 2.1-6: Enthalpy difference for the limiting cases of Schottky or Frenkel Defects

Solution to Exercise 2.1-6

© H. Föll (Defects - Script)