Thermoluminescence and defect study of MgSiO₃ ceramics

Abstract

Enstatite (MgSiO₃) ceramic powders were synthesised by a low-temperature initiated self-propagating, gas-producing solution combustion process. The prepared powders were characterised by powder X-ray diffraction, scanning electron microscopy and Brunauer–Emmer–Teller specific surface area measurements. Defect centres induced by radiation were studied using the techniques of thermoluminescence (TL) and electron spin resonance (ESR). A well-resolved glow with peak at 178°C and a shouldered peak at 120°C were observed. Two defect centres were identified by ESR measurements, which were carried out at room temperature, and these were assigned to an O⁻ ion and F⁺ centre. The O⁻ ion (hole centre) appears to correlate with the main TL peak at 178°C.

Keywords:

• ceramics
• luminescence
• enstatite
• gamma irradiation
• ESR

Acknowledgements

H.B. Premkumar and Nalina Anil thank Jain University for providing financial support to carry out this minor research project. Dr. RPSC thanks Dr. H.S. Maiti, Director CGCRI, and Dr. Ranjan Sen, Head, Glass Technology Laboratory, CGCRI, for their constant encouragement.