The effect of off-center Cu2+ ions on the phase transition in lead germanate crystals

Authors
Trubitsyn, MP Pozdeev, VG
Citation
Mp. Trubitsyn et Vg. Pozdeev, The effect of off-center Cu2+ ions on the phase transition in lead germanate crystals, PHYS SOL ST, 42(12), 2000, pp. 2254-2257
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICS OF THE SOLID STATE
ISSN journal
10637834 → ACNP
Volume
42
Issue
12
Year of publication
2000
Pages
2254 - 2257
Database
ISI
SICI code
1063-7834(2000)42:12<2254:TEOOCI>2.0.ZU;2-I
Abstract
The properties of Pb5Ge3O11:Cu2+ crystals near the temperature of the ferro electric phase transition are discussed in terms of a phenomenological appr oach. Assuming a quadratic interaction with the order parameter, the effect of Cu2+ is considered a result of static distortions, which result from th e off-center position of the copper impurity ions in the lead germanate str ucture. In this approximation, Cu2+ jumps between off-center positions do n ot affect the dynamic properties of the crystal matrix near T-C. (C) 2000 M AIK "Nauka/Interperiodica".