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Electron Paramagnetic Resonance studies of Mn2+ activated willemite phosphor

Chakradhar, Sreekanth RP and Nagabhushana, BM and Chandrappa, GT and Ramesh, KP and Rao, JL (2003) Electron Paramagnetic Resonance studies of Mn2+ activated willemite phosphor. In: DAE Solid State Physics Symposium, Dec 26 - 30, 2003, Gwalior,India.

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Abstract

Manganese activated willemite phosphor (Zn2-xMnxSiO4) (0.1\leq x \leq 0.5) have been synthesized by a novel low-temperature initiated, self-propagating, gas producing combustion process. The crystal structure and lattice parameters calculated form XRD confirm that Zn2-xMnxSiO4 has a rhombohedral structure (space group R3H). The DTA shows a small broad exothermic peak at 910 degree C can be attributed to the conversion of \beta-willemite to \alpha-willemite phase. The EPR spectra of Mn2+ ions exhibit a sextet hyperfine structure centered around g \cong 2.02 with a total peak width of \cong 490 G. The hyperfine splitting (A) for Mn2+ indicates that the Mn2+ is in an ionic environment. The number of spins participating in resonance (N) and the calculated paramagnetic susceptibility increases with x. The Mn ions in doped Zn2SiO4 also have 4-coordination because they replace some of the Zn2+ ions in the lattice.

Item Type: Conference Poster
Keywords: Electron Paramagnetic Resonance;Mn2+; willemite phosphor
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 Jan 2005
Last Modified: 19 Sep 2010 04:17
URI: http://eprints.iisc.ernet.in/id/eprint/2603

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