Chemical Analysis of Thermoluminescent Colorless Topaz Crystal Using Laser-Induced Breakdown Spectroscopy

• Published in: Minerals (Basel) Vol. 11; no. 4; p. 367
• Main Authors: Shahab Ahmed Abbasi, Muhammad Rafique, Taj Muhammad Khan, Adnan Khan, Nasar Ahmad, Mohammad Rashed Iqbal Faruque, Mayeen Uddin Khandaker, Pervaiz Ahmad, Abdul Saboor
• Format: Journal Article
• Language: English
• Published: MDPI AG 01-04-2021
• Subjects: CF-LIBS; energy-dispersive x-ray; laser fluence; topaz crystal; topaz plasma
• ISSN: 2075-163X
• DOI: 10.3390/min11040367

We present results of calibration-free laser-induced breakdown spectroscopy (CF-LIBS) and energy-dispersive X-ray (EDX) analysis of natural colorless topaz crystal of local Pakistani origin. Topaz plasma was produced in the ambient air using a nanosecond laser pulse of width 5 ns and wavelength 532 nm. For the purpose of detection of maximum possible constituent elements within the Topaz sample, the laser fluences were varied, ranging 19.6–37.6 J·cm−2 and optical emission from the plasma was recorded within the spectral range of 250–870 nm. The spectrum obtained has shown the presence of seven elements viz. Al, Si, F, O, H, Na and N. Results shows that the fluorine was detected at laser fluence higher than 35 J·cm−2 and plasma temperature of >1 eV. Al and Si were found as the major compositional elements in topaz crystals. The ratios of concentrations of Al and Si were found as 1.55 and 1.59 estimated by CF-LIBS and EDX, respectively. Furthermore, no impurity was found in the investigated colorless topaz samples.