Showing papers by "Sujit Roy published in 1995"
TL;DR: In this paper, the authors studied the yttria-yttria gels with coprecipitation and drying at 373 K. The gels undergo elimination of water over a wide temperature range of 373-673 K and the peak temperature of the endotherm corresponding to dehydration and the kinetic constants for the process were not influenced by the ytria content of the gel.
Abstract: Zirconia and zirconia-yttria gels containing 4 and 8 mol % yttria were obtained by coprecipitation and drying at 373 K. The dehydration and crystallization behavior of the dried gels was studied by DSC, TG, and XRD. The gels undergo elimination of water over a wide temperature range of 373–673 K. The peak temperature of the endotherm corresponding to dehydration and the kinetic constants for the process were not influenced by the yttria content of the gel. The enthalpy of dehydration observed was in good agreement with the heat of vaporization data. The dehydration was followed by a sharp exothermic crystallization process. The peak temperature of the exotherm and the activation energy of the process increased with an increase in yttria content, while the enthalpy of crystallization showed a decrease. The “glow effect” reduced with increasing yttria content. Pure zirconia crystallizes in the tetragonal form while the zirconia containing 4 and 8 mol% yttria appears to crystallize in the cubic form.
50 citations
TL;DR: Boron nitride films were grown for the first time by metal-organic chemical vapour deposition from trimethyl borazine as a single-source organometallic precursor containing boron and nitrogen.
22 citations
Journal Article•
2 citations
TL;DR: In this paper, the first examples of alkylation and oxidation of thiols by cobalt in weakly coordinating ligand (MeCN) environment is presented as a mimic to B12-dependent nonenzymatic reaction.
Abstract: The first examples of alkylation and oxidation of thiols by cobalt in weakly coordinating ligand (MeCN) environment is presented as a mimic to B12-dependent nonenzymatic reaction.