Crystal-field and superposition model analysis of R3+:BaY2F8 (R = Er, Dy, Nd)
INFM and Dipartimento di Fisica, Università di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy
Corresponding author: a Giuseppe.Amoretti@fis.unipr.it
Revised: 12 July 2002
Published online: 17 September 2002
The experimental values of the energy levels of Er3+, Dy3+, and Nd3+ in BaY2F8 were fitted to a single-ion Hamiltonian containing free-ion and crystal-field interactions. The crystal-field parameters so evaluated were then analyzed by using Newman's Superposition Model. The agreement between the two sets of parameters is good, provided a possible distortion of the F- polyhedron around the rare-earth site is taken into account. The effects of a possible displacement of the rare-earth ion substituting for Y3+ are also evaluated.
PACS: 71.70.Ch – Crystal and ligand fields / 78.30.Am – Elemental semiconductors and insulators
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002