Spectroscopy of Cr$^{\bf{3+}}$ in ferroelectric ceramics lead-lanthanum zirconate-titanate-x/95/5 with Lanthanum content $x$ = 0.5 to 4 wt %

I. El-Harrad; C. Carabatos-Nédelec; A. Ridah

doi:doi:10.1051/jp4:2005123033

Numéro		J. Phys. IV France Volume 123, March 2005


Page(s)		193 - 196
DOI		https://doi.org/10.1051/jp4:2005123033

J. Phys. IV France 123 (2005) 193-196
DOI: 10.1051/jp4:2005123033

Spectroscopy of Cr $^{\bf {3+}}$ in ferroelectric ceramics lead-lanthanum zirconate-titanate-x/95/5 with Lanthanum content x = 0.5 to 4 wt %

I. El-Harrad^{1, 2}, C. Carabatos-Nédelec³ and A. Ridah²

¹ Matériaux Micro-Optoélectroniques et Photonique, LOTEA, FSTE, BP. 509, Boutalamine, Errachidia, Maroc
² Laboratoire de Contrôle et d'Analyse des Matérieux, Faculté des Sciences Ben Msik, BP. 7955, Casablanca, Maroc
³ Centre Lorrain d'Optique et Électronique des Solides, Université de Metz et Supélec, 2 rue E. Belin, Metz, France

Abstract
The study shows the importance of internal optical transitions $^{2}{\rm E} \to^{4}$ A₂ of the excited Cr³⁺ ions used as a probe of the ceramics in the microscopic scale. The results are interpreted in terms of Cr³⁺ luminescent centres and simultaneous vibrational excitations of the lattice. In presence of thermally activated disorder, the PLZT-x/95/5 ferroelectric ceramics lead to interesting spectral variations with temperature by appearance of certain vibronic sidebands observed around the pure electronic transitions. The phononic origin of the process is analysed in terms of lattice perturbation in the environment of the Cr³⁺ sites.

Spectroscopy of Cr in ferroelectric ceramics lead-lanthanum zirconate-titanate-x/95/5 with Lanthanum content x = 0.5 to 4 wt %

Spectroscopy of Cr $^{\bf {3+}}$ in ferroelectric ceramics lead-lanthanum zirconate-titanate-x/95/5 with Lanthanum content x = 0.5 to 4 wt %