Hydrothermal synthesis and characterization of CaSO(4) pseudomicrorods
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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Title |
Hydrothermal synthesis and characterization of CaSO(4) pseudomicrorods
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Creator |
Nagabhushana, H
Nagaraju, G Nagabhushana, B M Shivakumara, C Chakradhar, R P S |
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Subject |
Engineering Materials
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Description |
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.
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Publisher |
Taylor & Francis
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Date |
2010
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cgcri.csircentral.net/824/1/nagabhushana.pdf
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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Relation |
http://cgcri.csircentral.net/824/
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