conduction band

(redirected from Conduction electrons)
Also found in: Dictionary, Wikipedia.
Related to Conduction electrons: Conduction band

Conduction band

The electronic energy band of a crystalline solid which is partially occupied by electrons. The electrons in this energy band can increase their energies by going to higher energy levels within the band when an electric field is applied to accelerate them or when the temperature of the crystal is raised. These electrons are called conduction electrons, as distinct from the electrons in filled energy bands, which, as a whole, do not contribute to electrical and thermal conduction. In metallic conductors the conduction electrons correspond to the valence electrons (or a portion of the valence electrons) of the constituent atoms. In semiconductors and insulators at sufficiently low temperatures, the conduction band is empty of electrons. Conduction electrons come from thermal excitation of electrons from a lower energy band or from impurity atoms in the crystal. See Band theory of solids, Electric insulator, Semiconductor, Valence band

conduction band

[kən′dək·shən ‚band]
(solid-state physics)
An energy band in which electrons can move freely in a solid, producing net transport of charge.
References in periodicals archive ?
c] to estimate the effect of the field of conduction electrons at the position of a test charge Q.
This is the first time that strong nuclear spin polarisation of a defect atom in a solid is demonstrated at room temperature by spin-polarised conduction electrons.
The surface resistance is inversely proportional to the conduction electrons present in the surface region, ns i.
The conduction electron density and normal-state conductivity are also one to two orders-of-magnitude higher than either the Nb-based alloys or Bi-based cuprates used in present day wires, contradicting the conventional wisdom that good superconductors are poor conductors because of the strong electron-phonon interaction and at the same time providing encouragement that higher [T.
Au(III)-Pt(III) or Cu(III)-Ni(III) ) will be chosen in order to put into evidence the role of the paramagnetic centres and their possible interplay with conduction electrons.
The spin polarization of the conduction electrons due to Andreev reflection at ferromagnetic/superconductor interface could be determined through the following equation as:
Other theorists countered that the spins of conduction electrons are usually randomly oriented, with every up spin canceled by a down spin.
By processing the polymer so that millions of chains line up side by side, the Ohio team and others can make materials in which conduction electrons can almost always avoid dead-ends by hopping to adjacent chains.
Instead of having many conduction electrons as in a metal, the ceramics appears to have very few -- a meaty paradox for superconductor theorists to demystify.
What leads to superconductivity, despite the repulsion between conduction electrons, is an effective attractive interaction between those holes as they move around," Goddard says.
Ordinary metals have such conduction electrons in great abundance, but the new superconducting materials are ceramics with far fewer free electrons in them.
In that case, valence electrons, the electrons that bind the atoms together in the crystal (which are not the same as the conduction electrons that form electric currents) jump from one atom to another, causing force distortions that bind the conduction electrons in pairs.