Dhananjaya, N. and Nagabhushana, H. and Nagabhushana, B. M. and Rudraswamy, B. and Shivakumara, C. and Chakradhar, R P S (2011) Hydrothermal synthesis, characterization and Raman studies of Eu(3+) activated Gd(2)O(3) nanorods. Physica B-Condensed Matter, 406 (9). pp. 1639-1644. ISSN 0921-4526

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Abstract

Eu(3+) (8 mol%) activated gadolinium oxide nanorods have been prepared by hydrothermal method without and with surfactant, cityl trimethyl ammonium bromide (CTAB). Powder X-ray diffraction (PXRD) studies reveal that the as-formed product is in hexagonal Gd(OH)(3):Eu phase and subsequent heat treatment at 350 and 600 degrees C transforms the sample to monoclinic GdOOH:Eu and cubic Gd(2)O(3):Eu phases, respectively. The structural data and refinement parameters for cubic Gd(2)O(3):Eu nanorods were calculated by the Rietveld refinement. SEM and TEM micrographs show that as-obtained Gd(OH)(3):Eu consists of uniform nanorods in high yield with uniform diameters of about 15 nm and lengths of about 50-150 nm. The temperature dependent morphological evolution of Gd(2)O(3):Eu without and with CTAB surfactant was studied. FTIR studies reveal that CTAB surfactant plays an important role in converting cubic Gd(2)O(3):Eu to hexagonal Gd(OH)(3):Eu. The strong and intense Raman peak at 489 cm(-1) has been assigned to A(g) mode, which is attributed to the hexagonal phase of Gd(2)O(3). The peak at similar to 360 cm(-1) has been assigned to the combination of F(g) and E(g) modes, which is mainly attributed to the cubic Gd(2)O(3) phase. The shift in frequency and broadening of the Raman modes have been attributed to the decrease in crystallite dimension to the nanometer scale as a result of phonon confinement.

Item Type:	Article
Uncontrolled Keywords:	Hydrothermal synthesis; Nanorods; Gd(2)O(3):Eu; XRD; SEM; TEM; FTIR; Raman
Subjects:	Microstructure and Characterization
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Jan 2012 12:10
Last Modified:	02 Mar 2012 10:56
URI:	http://cgcri.csircentral.net/id/eprint/211

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