The Goldschmidt rule - says that a complete isomorphism is possible only between atoms whose ionic radii differ by 10-15%.
Content
History
V.M. Goldschmidt, 1915
The rule was discovered in 1926, named after the name of its discoverer - Victor Moritz Goldschmidt .
Description
The Goldschmidt rule postulates that isomorphism is possible only between ions whose size differs by no more than 10-15%.
The Magnus-Goldschmidt rule determines the coordination number of the cation depending on the ratio of the cation radius to the radius of the anion.
| Coordination number | Coordination polyhedron | Cation radius / Anion radius |
|---|---|---|
| 12 | cuboctahedron | 1,000 |
| 9 | vertically centered trigonal prism | 0.732 |
| eight | cube | 0.732 |
| eight | square antiprism | 0.645 |
| 7 | octahedron with one centered face | 0.592 |
| 6 | octahedron | 0.414 |
| four | tetrahedron | 0.215 |
| 3 | triangle | 0.155 |
Notes
Literature
- Goldschmidt V.M. Crystal chemistry. L .: Himteoret. 1937.62 p.