UNSPECIFIED (2005) Nanocrystalline Macroporous Wollastonite Ceramics - A Spectroscopic View. In: 50th DAE Solid State Physics Symposium, Dec. 5 - 9, 2005., Bhabha Atomic Research Centre, Mumbai.
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Abstract
Nanocrystalline macroporous $CaSiO_{3}$ ceramic powders have been synthesized by a novel low temperature initiated self-propagating, gas producing solution combustion process. The effects of temperature on crystalline phase formation, amount of porogens and particle size of porous $CaSiO_{3}$ have been investigated. Single phase \beta-$CaSiO_{3}$ and \alpha-$CaSiO_{3}$ are formed at much lower temperatures to the powders obtained via solid state reaction method. On calcination the samples becoming more porous and the pore diameter increases from 2 to 8 \mu m. The samples calcined at 950 degree C has 17.5 % porosity, and the porosity increases to 31.6 % at 1200 degree C. The surface area of as formed and calcined at 950 and 1200 degree C of $CaSiO_{3}$ samples were found to be 31.93 $m^{2}$/g, 0.585 $m^{2}$/g and 3.48 $m^{2}$/g respectively. The TL intensity in powdered sample is more when compared to the pelletized $CaSiO_{3}$ and it is further observed that there is a shift in glow peak temperatures in pelletized sample. This is attributed to the inter particle spacing and pressure-induced defects. The structure of $CaSiO_{3}$ has been investigated by $^{29}Si$ MAS NMR.
| Item Type: | Conference Proceedings |
|---|---|
| Series.: | 50th |
| Publisher: | Prime Time Education |
| Keywords: | Nanocrystalline;Macroporous;Wollastonite;Ceramics;NMR;FTIR; XRD;Porosity;Surface area;Thermo-luminescence |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 12 Dec 2005 |
| Last Modified: | 19 Sep 2010 04:22 |
| URI: | http://eprints.iisc.ac.in/id/eprint/4417 |
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