V K Vaidyan
Articles written in Bulletin of Materials Science
Volume 2 Issue 4 November 1980 pp 265-270 Communications
Effect of an applied electric field on the oxidation rate of vacuum deposited aluminium thin films were studied at room temperature in the laboratory atmosphere. Above the critical field, a negative potential applied to the film enhanced the rate of oxidation, while a positive field retarded the rate. This suggests an oxidation mechanism involving cationic diffusion. The observed change in the rate of oxidation for an applied field agrees with the Mott-Cabrera theory.
Volume 10 Issue 3 May 1988 pp 223-231
Different stages of iron films evaporated under a vacuum of about 10−5 torr were investigated with and without the addition of aluminium impurity at different percentages. Micrographs of such films heated at 623 K for 2 h show similar network spreading of oxide growth. Addition of aluminium significantly improves the oxidation resistance of iron films by the formation of Al2O3 layer.
Volume 12 Issue 2 July 1989 pp 159-162
Thin films of Al-2 wt% Li alloy are prepared on well-cleaned glass substrates by vacuum evaporation at room temperature. Electrical conductivity studies of both alloy Al(Li) and pure Al films show that they obey the logarithmic rate law during the initial period of oxidation. The addition of lithium, however, increases the oxidation rate considerably during the initial period of oxidation. Surface analysis by laser Raman spectroscopy indicates the existence of LiO2 and Al2O3 as the most probable oxide components.
Volume 17 Issue 2 April 1994 pp 105-110
Calcium pyrophosphate dihydrate crystals, which are responsible for various arthritic diseases, were grown in sodium metasilicate gel. Variations in gel density, pH value and concentration of the reactants were found to have profound effect on the growth of the crystals. The grown crystals were characterized using IR, XRD, TGA and optical microscopy.
Volume 18 Issue 5 September 1995 pp 557-562
Stoichiometric polycrystalline tin oxide thin films were deposited by the reactive evaporation of tin and the SnO2 formation was found to be strongly dependent on the deposition parameters. The preferred orientation of the SnO2 films deposited on different substrates was varying due to the dislocation defects arising during the thin film formation. The X-ray diffraction (XRD) studies identified a tetragonal structure while the scanning electron microscopic (SEM) studies revealed a polycrystalline surface for the SnO2 films reactively deposited.
Volume 21 Issue 2 April 1998 pp 121-126
Anthraquinone, an oxidation product of anthracene, has been grown by gel aided solution technique employing sodium metasilicate. Needle shaped crystals were obtained in 0–5% (w/v) solution of anthraquinone for pH 5-5. The grown crystals were characterized by optical microscopy, SEM, IR, UV and XRD.
Volume 22 Issue 5 August 1999 pp 921-926 Thin Films
Zinc oxide thin films were prepared on glass substrates from an aqueous solution of zinc acetate by spray pyrolysis. These films were characterized using X-ray diffraction, scanning electron microscopy and optical transmission. The films were highly transparent to the visible radiation and electrically conductive. Films deposited at optimum conditions exhibited a resistivity of 3·15×10−3 Ωm along with a transmittance of 98% at 550 nm.
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