Saikia Chaliha, Reenamoni and Annapurna, K and Tarafder, Anal and Tiwari, V S and Gupta, P K and Karmakar, Basudeb (2010) Structure, dielectric and optical properties of transparent Nd(3+):KNbO(3) nanocrystalline glass-ceramics. Optical Materials , 32 (9). pp. 1202-1209. ISSN 0925-3467

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Abstract

Here, glass in the composition of 25K2O–25Nb2O5–50SiO2 (mol%) doped with Nd2O3 (0.5 wt.% in excess)was isothermally crystallized at 800 C for 1–100 h. Their structures, dielectric and optical properties were analyzed with the progress of nanocrystallization of Nd3+: KNbO3 by XRD, FESEM, TEM, FTIRRS, DC, optical absorption and fluorescence measurements. Crystallization of KNbO3 is confirmed from XRD and the appearance of 749 cm-1 band in the FTIRRS spectra. The crystallite size estimated from XRD and TEM is found to vary in the range 7–11 nm. The formation of ferroelectric nano-crystalline KNbO3 phase is also attributed by a steep rise in the dielectric constant (e) of glass–ceramics with heat-treatment time. The measured photoluminescence spectra have exhibited emission transitions of 4F3/2?4IJ (J = 9/2, 11/2 and 13/2) from Nd3+ ions upon excitation at 817 nm. It is observed that the photoluminescent intensity and excited state lifetime of Nd3+ ions initially decrease and then gradually increase with increase in heat-treatment time. The absorption spectra and fluorescence measurements disclose that the Nd3+ ions gradually enter into the KNbO3 nanocrystals.

Item Type:	Article
Uncontrolled Keywords:	Transparent glass-ceramic; Nano-crystallized Nd(3+):KNbO(3); Luminescence; Ferroelectric crystals; Dielectric constant
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	09 Feb 2012 07:58
Last Modified:	28 Mar 2012 10:46
URI:	http://cgcri.csircentral.net/id/eprint/631

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