A transition occurring only in '
single-valent' systems from strongly
correlated
(
) to weakly correlated
(
)
electrons as a result of a change of bandwidth
.
reflects the strength of the interatomic interactions in a periodic
array of like atoms and
is a measure of the intra-atomic
interactions, i.e. the electrostatic energy involved in the creation
of polar states by transferring an electron from one atom to the
next, as shown schematically by the
disproportionation reaction:
A
produces a magnetic
semiconductor; a
gives rise to a
metal (normally nonmagnetic). Note also that
and
can be altered by changes in interatomic distances, brought about
through temperature or pressure variations or by introducing an
alloying element. Synonymous with Mott–Hubbard
transition.
Source:
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
1994))
on page 587
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
