Local lattice distortion induced by substitution of Si for Ge in Li2CaGe1-xSixO4 solid solutions
In: Journal of luminescence, Jg. 154 (2014), S. 496-501
Online
academicJournal
- print, 22 ref
Possible reasons for essential differences in values of the total crystal field splitting and centroid shift of Ce3+ 5d configuration for isostructural Li2CaGeO4 and Li2CaSiO4 were analyzed by means of X-ray diffraction method and luminescent spectroscopy. It was found that the increase in Si concentration in Ce3+ -doped Li2CaGe1-xSixO4 solid solutions leads to increasing of noncubic crystal field splitting parameter (Δ) of the Ce3+ 5d configuration, indicating to an enhancement of distortion from the cubic symmetry of the calcium dodecahedral site upon going from Li2CaGeO4 to Li2CaSiO4. The results of X-ray diffraction analysis of Li2CaGe1-xSixO4 show that the linear decrease of the unit-cell parameters with increasing Si-content is followed by complex changes in the geometry of the Ca polyhedra. Changes in the electronic structure with the composition of the solid solutions are also discussed.
Titel: |
Local lattice distortion induced by substitution of Si for Ge in Li2CaGe1-xSixO4 solid solutions
|
---|---|
Autor/in / Beteiligte Person: | BEREZOVSKAYA, I. V ; ZATOVSKY, I. V ; OGORODNYK, I. V ; VOLOSHINOVSKII, A. S ; EFRYUSHINA, N. P ; DOTSENKO, V. P |
Link: | |
Zeitschrift: | Journal of luminescence, Jg. 154 (2014), S. 496-501 |
Veröffentlichung: | Amsterdam: Elsevier, 2014 |
Medientyp: | academicJournal |
Umfang: | print, 22 ref |
ISSN: | 0022-2313 (print) |
Schlagwort: |
|
Sonstiges: |
|