Nagabhushana, H and Nagaraju, G and Nagabhushana, B M and Shivakumara, C and Chakradhar, R P S (2010) Hydrothermal synthesis and characterization of CaSO(4) pseudomicrorods. Philosophical Magazine Letters, 90 (4). pp. 289-298. ISSN 0950-0839

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Abstract

Calcium sulphate (CaSO(4)) pseudomicrorods have been synthesized by a low-temperature hydrothermal method using CaSO(4) powder as a precursor and hexadecylamine as a surfactant at 180 degrees C for at different intervals of time. The powder X-ray diffraction pattern indicates that the as-formed pseudomicrorods are of orthorhombic phase with lattice parameters a = 7.0023(4) angstrom, b = 6.9939(5) angstrom and c = 6.2434(4) angstrom. Scanning electron microscopy images show that the pseudomicrorods have diameters of about 0.2-2.5 mm and lengths of about 2-10 mm. Fourier transform infrared spectroscopy shows a strong doublet near 609 and 681 cm(-1) arising from nu(4) (SO(4)(2)) bending vibrations. The strongest band observed at 1132 cm(-1) is associated with nu(3) (SO(4)(2-)) stretching vibrations. The band near 420-450 cm(-1) is attributed to nu(2) (SO(4)(2-)) bending vibrations. The Raman spectrum exhibits an intense peak at 1008 cm(-1) associated with the SO(4)(2-) mode. The photoluminescence spectrum exhibits UV bands (330, 350 nm), strong green bands (402, 436 nm) and weak blue bands (503 nm). A widening of the optical band gap was observed as the particle size decreased.

Item Type:	Article
Uncontrolled Keywords:	Hydrothermal; CaSO(4) pseudomicrorods; FT-IR; Raman spectroscopy; Photoluminescence
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	14 Feb 2012 12:40
Last Modified:	29 Mar 2016 06:57
URI:	http://cgcri.csircentral.net/id/eprint/824

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