期刊
CERAMICS INTERNATIONAL
卷 40, 期 7, 页码 9629-9636出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.02.043
关键词
BaAl12O19; Combustion; Luminescence; Cr3+; EPR
资金
- University Grants Commission, New Delhi
- KU Research Professor Program of Konkuk University
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 700 nm (14,286 cm(-1)) and this band has been attributed to E-2(g)->(4)A(2g), transition. (c) 2014 Published by Elsevier Ltd and Techna Group S.r.l.
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