Premium
Charge Ordering in the Anti‐Th 3 P 4 Structure
Author(s) -
Lorenz B.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221250143
Subject(s) - charge ordering , lattice (music) , phase transition , condensed matter physics , charge (physics) , thermodynamics , transition temperature , lattice energy , rare earth , materials science , chemistry , crystal structure , physics , crystallography , mineralogy , quantum mechanics , superconductivity , acoustics
The existence of charge ordering in rare‐earth compounds crystallizing in the anti‐Th 3 P 4 structure is investigated. On the basis of Madelung energy calculations it is shown that for instance in Eu 4 As 3 the electrostatic interactions stabilize a charge ordered low temperature phase. The thermodynamics and the transition to the disordered phase are described by a lattice gas model. The transition is found to be of first order. The transition temperature estimated for Eu 4 As 3 lies well above room temperature. The theoretical results are compatible with recent experiments, although the transition itself has to be confirmed by high temperature measurements.