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IJPAP Vol.44(01) [January 2006] >


Title: Effect of preheating in biogenic shells—Thermostimulated luminescence and FTIR study
Authors: Ponnusamy, V
Ramasamy, V
Anandalakshmi, K
Keywords: Thermal treatment
Aragonite
Biogenic shells
Calcite
Glow curve characteristics
FTIR
Issue Date: Jan-2006
Publisher: CSIR
IPC CodeG01J 3/28
Abstract: The thermostimulated luminescence (TSL) and Fourier transform infrared (FTIR) measurements were carried out for ten biogenic shells at room temperature (RT) and various temperatures in the range 200-800°C, at an interval of 50°C, for 1 hr duration. The glow curves of unannealed sample show only one peak at 330°C. The sample irradiated with a gamma dose of 500 Gy shows an additional peak at 130°C, when recorded with linear heating rate of 10°C/s. The annealed sample also shows the same trend. Annealing treatment above 250°C increases the sensitivity of 130°C TSL peak. A sudden reduction in TSL sensitivity at 500°C is observed. At this temperature (500°C), FTIR study shows structural disorderedness or phase transition and formation of new structure in the major mineral content. On the other hand, preheating at 700°C caused a collapse in the TSL sensitivity.
Page(s): 13-19
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(01) [January 2006]

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