Preparation, characterization and spectral studies of Cr1−xEuxBO3 (x=0, 0.01 and 0.05)

Rare earth (Eu3+)-doped transition metal borate of compositions Cr1-xEuxBO3 (x=,0.01 and 0.05) have been prepared by B2O3 flux method in ultra pure form. All compositions are characterized by powder XRD and crystallized in hexagonal lattice with space group. IR spectra show characteristic planar BO3...

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Published in:Materials chemistry and physics 2008-04, Vol.108 (2-3), p.319-324
Main Authors: Anantharamulu, N., Vijaya Kumar, B., Rama Devi, V., Vithal, M.
Format: Article
Language:English
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Summary:Rare earth (Eu3+)-doped transition metal borate of compositions Cr1-xEuxBO3 (x=,0.01 and 0.05) have been prepared by B2O3 flux method in ultra pure form. All compositions are characterized by powder XRD and crystallized in hexagonal lattice with space group. IR spectra show characteristic planar BO3 vibrational bands. The diffuse reflectance spectra (DRS) are consistent with ligand to metal ion charge transfer and octahedral symmetry around Cr3+ ion. From the observed band positions, the crystal field parameter Dq and Racah interelectronic repulsion parameters B and C are calculated. From the excitation spectrum of Cr0.95Eu0.05BO3, the phonon energy and electron-phonon-coupling strength are obtained. Its emission spectrum has two intense transitions corresponding to 5D0- > 7F2 at 614nm in the red and 5D0- > 7F1 at 592nm in orange regions.
ISSN:0254-0584
DOI:10.1016/j.matchemphys.2007.09.040