SYNTHESIS, CRYSTAL-STRUCTURE AND PHYSICAL-PROPERTIES OF LANTHANIDE BETA''-ALUMINAS

Authors
DEDECKE T KOHLER J TIETZ F URLAND W
Citation
T. Dedecke et al., SYNTHESIS, CRYSTAL-STRUCTURE AND PHYSICAL-PROPERTIES OF LANTHANIDE BETA''-ALUMINAS, European journal of solid state and inorganic chemistry, 33(2-3), 1996, pp. 185-196
Citations number
23
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
European journal of solid state and inorganic chemistry → ACNP
ISSN journal
09924361
Volume
33
Issue
2-3
Year of publication
1996
Pages
185 - 196
Database
ISI
SICI code
0992-4361(1996)33:2-3<185:SCAPOL>2.0.ZU;2-O
Abstract
Na+-beta''-alumina crystals are synthesized by a flux evaporation tech nique. An ion exchange procedure is given for the preparation of lanth anide ion exchanged Na+-beta''-Al2O3 crystals. Impedance spectroscopy measurements showed a lanthanide ion mobility in the high temperature region (T > 500 K). The ionic conductivity is lowered with decreasing radii of the incorporated lanthanide ions. The magnetic behaviour of a highly Pr3+-exchanged Na+-beta''-Al2O3 single crystal has been invest igated. The experimental data show strong anisotropic behaviour. From the magnetic data a preferential sire occupancy of the Pr3+ ions at th e mO site was derived. The influence of the coordination geometry on t he magnetic properties is investigated by ligand-field calculations ap plying the angular overlap model (AOM).