Local lattice distortion induced by substitution of Si for Ge in Li2CaGe1−xSixO4 solid solutions

Autor:	I.V. Zatovsky, V. P. Dotsenko, A. S. Voloshinovskii, I. V. Berezovskaya, N. P. Efryushina, I.V. Ogorodnyk
Rok vydání:	2014
Předmět:	Diffraction Chemistry Biophysics General Chemistry Electronic structure Crystal structure Condensed Matter Physics Biochemistry Molecular physics Atomic and Molecular Physics and Optics Crystallography Dodecahedron Crystal field theory Isostructural Spectroscopy Solid solution
Zdroj:	Journal of Luminescence. 154:496-501
ISSN:	0022-2313
DOI:	10.1016/j.jlumin.2014.05.034
Popis:	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 (∆) 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8d729f17cd2ccdfc2199f7a52ca9ec12 https://doi.org/10.1016/j.jlumin.2014.05.034 Zobrazit plný text záznamu Full Text from ScienceDirect