Abstract
In this study, the structural and spectroscopic properties of AWO4 (A = Ca, Sr, Ba, Mg, Zn and Cu) ceramics synthesized by conventional solid-state reaction technique were investigated. The local structure around the W and accessible various metal cations have been investigated using X-ray absorption spectroscopy (XAS). Local structural changes have been observed in scheelite-type structures and wolframite type structures. β-irradiated thermoluminescence (TL) glow curve for all samples were recorded and analyzed to obtain the trapping parameters, such as activation energy (E), order of kinetics (b) and frequency factor (s). The scheelite-type tungstates exhibited a distinct TL peak of second order kinetics indicating the presence of deeper traps, whereas wolframite-type tungstates did not exhibit such peak. Apart from BaWO4, and CuWO4, all the other samples demonstrated broad radioluminescence (RL) in the range 400 nm–700 nm when subjected to X-ray excitation. The RL and TL properties of the AWO4 ceramics are correlated with their respective crystallographic structure.
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