An electron paramagnetic resonance and optical study of Cr doped BaAl12O19 powders

The BaAl12O19 powders doped with Cr3+ ions have been prepared by a low-temperature combustion synthesis method. As prepared combustion synthesized powder was characterized using powder X-ray diffraction and energy dispersive analysis of X-ray methods. The diffuse reflectance spectrum exhibits three...

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Bibliographic Details
Published in:Ceramics international 2014-08, Vol.40 (7), p.9629-9636
Main Authors: Singh, Vijay, Sivaramaiah, Gobburu, Rao, J.L., Sripada, Suresh, Kim, S.H.
Format: Article
Language:English
Subjects:
BaAl12O19
Combustion
Cr3
EPR
Luminescence
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Summary:The BaAl12O19 powders doped with Cr3+ ions have been prepared by a low-temperature combustion synthesis method. As prepared combustion synthesized powder was characterized using powder X-ray diffraction and energy dispersive analysis of X-ray methods. The diffuse reflectance spectrum exhibits three bands characteristic of Cr3+ ions in distorted octahedral symmetry. The EPR spectra exhibit signals with the effective g values at g=1.96, 2.27 and 4.85. The signals with the effective g values at g=2.27 and 4.85 have been attributed to the isolated Cr3+ ions. The signal at g=1.96 has been attributed to the exchange coupled Cr3+ ions. The excitation spectrum exhibits bands characteristic of Cr3+ ions in distorted octahedral symmetry. The ligand field parameter Dq and the Racah interelectronic repulsion parameters B and C have been evaluated from the excitation spectrum. The emission spectrum exhibits an intense band centered at 700nm (14,286cm−1) and this band has been attributed to 2Eg→4A2g transition.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2014.02.043