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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
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 Code: | G01J 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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