crystal-field theory A theory describing the behaviour of elements with partly filled d- or f-orbitals. In geochemistry it is particularly concerned with the crystal-field (ligand-field) effects on the first transition metal ions, i.e. Sc, Ti, V, Cr, Mn, Fe, Co, Ni, and Cu. If the anions surrounding a cation are considered as point charges then the electrostatic interactions between them will vary according to: (a) ionic distance; (b) the strength of the charge; and (c) the coordination number (how anions are distributed around the cation). Some of the five d-orbitals will have maximum electron density nearer to the anion than others. Interactions between cation and anion will affect the energies of the d-orbitals and cause a separation of energy levels between orbitals (crystal-field splitting).
More From encyclopedia.com
Quantum Field Theory , Quantum field theory is the widely accepted tool for describing systems such as the electromagnetic field, in accordance with the laws of quantum mec… Quantum Electrodynamics , Quantum Electrodynamics (QED) Quantum electrodynamics (QED) is a scientific theory that is also known as the quantum theory of light. QED describes t… Accelerator , Particle accelerators are scientific instruments used to accelerate elementary particles to very high energies. They are of paramount importance for… Field , Field Resources A field is the name given to a pair of numbers and a set of operations that together satisfy several specific laws. A familiar exampl… TECHNICOLOR , TECHNICOLOR The discovery of the W and Z bosons in 1983 at the European Laboratory for Particle Physics (CERN) in Geneva, Switzerland, provided compe… Hideki Yukawa , Yukawa, Hideki YUKAWA, HIDEKI physics. Hideki Yukawa, incentor of the meson theory of nuclear forces, was the fifth of seven children born to Takuji…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like