| Synthesis, Characterization and TL Studies of
Porous CaSiO3 Ceramic Powders |
R. P. Sreekanth Chakradhar, B. M. Nagabhushana, G. T. Chandrappa
H. Nagabhushana, K. P. Ramesh and J. L. Rao
Pages : 157-162
DOI :10.1080/0371750X.2005.11012206 |
| Abstract |
| Nanocrystalline porous CaSiO3 ceramic powders have been synthesized by a novel low temperature initiated self-propagating, gas producing solution combustion process and characterized by XRD, SEM, EDS (energy dispersive spectroscopy), porosity, surface area and thermoluminescence (TL) studies. The effect of temperature on crystalline phase formation, amount of porogens and particle size of porous CaSiO3 have been investigated. Single phase -CaSiO3 and -CaSiO3 were formed at 950° and 1200°C respectively. The phase transformation temperatures of combustion derived CaSiO3 were found to be low compared to the powders obtained via solid state reaction method. The microstructure and morphology were studied by SEM and it was noted that with increase in calcination temperature, the samples became more porous and the pore diameter increased from 0.25 to 8 µm. The samples calcined at 950°C for 3 h had 17.5% porosity, however, the porosity increased to 31.6% on calcination at 1200°C for 3 h. The surface areas of the as-formed and calcined (at 950° and 1200°C) CaSiO3 samples were found to be 31.93, 0.585 and 3.48 m2.g–1 respectively. The TL intensity in powder sample was more intense when compared to the pelletized CaSiO3 and it was further observed that there was a shift in glow peak temperatures in pelletized sample. This is attributed to the interparticle spacing and pressure-induced defects. |
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