Absorption, fluorescence, and electron spin resonance investigation of tervalent cerium activated LaMgAl11O19

Single crystals of the magnetoplumbite (MP)-like compounds La1−xCex MgAl11O19 (0≤x≤1) have been grown from the melt by the flame fusion method. These crystals have been characterized by optical absorption and fluorescence which occur between 4f and 5d levels as well as by electron spin resonance at...

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Bibliographic Details
Published in:Journal of applied physics 1988-08, Vol.64 (3), p.1398-1404
Main Authors: VIANA, B, AKA, G, VIVIEN, D, LEJUS, A. M, THERY, J, DERORY, A, BERNIER, J. C, GARAPON, C, BOULON, G
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
Visible and ultraviolet spectra
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Summary:Single crystals of the magnetoplumbite (MP)-like compounds La1−xCex MgAl11O19 (0≤x≤1) have been grown from the melt by the flame fusion method. These crystals have been characterized by optical absorption and fluorescence which occur between 4f and 5d levels as well as by electron spin resonance at 20 K. For dilute samples (x≤0.15) all of these studies agree with a distribution of cerium between two kinds of sites with C2v point symmetry but with different optical spectroscopic properties whose occupation depends on the cerium content (x value). There is no evidence of any cerium in the regular MP lanthanide site with D3h symmetry. Several structural models which could account for these results are discussed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.342475