Tarafder, Anal and Annapurna, K and Saikia Chaliha, Reenamoni and Karmakar, Basudeb and Tiwari, Vidya Sagar and Gupta, Pradeep Kumar (2011) Effects of Nano-LiTaO(3) Crystallization on the Dielectric and Optical Properties in Er(3+)-Doped Li(2)O-Ta(2)O(5)-SiO(2)-Al(2)O(3) Glasses. International Journal of Applied Ceramic Technology, 8 (5). pp. 1031-1041. ISSN 1546-542X

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The precursor glass of LiTaO(3) nanocrystals was prepared in a new Er(3+)-doped Li(2)O-Ta(2)O(5)-SiO(2)-Al(2)O(3) system by the melt-quench technique. They were isothermally crystallized at 680 degrees C for 3-100 h to obtain nanostructured glass-ceramics. The X-ray diffraction and transmission electron microscopy confirm the nanocrystallization of LiTaO(3) (16-34 nm) yielding transparent glass-ceramics. A steep rise in the dielectric constant with the heat-treatment time is attributed to ferroelectric LiTaO(3) crystallization. Photoluminescence spectra exhibit the (4)I(13/2) -> (4)I(15/2) emission transition of Er(3+) ions at 1570 nm when excited at 984 nm. Its intensity and lifetime decrease with an increase in heat-treatment time due to concentration quenching effect.

Item Type: Article
Subjects: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Jan 2012 06:35
Last Modified: 28 Mar 2012 10:45
URI: http://cgcri.csircentral.net/id/eprint/432

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