Abstract
Intrinsic and Ho3+ doped HfO2 nanopowder are obtained by the co-precipitation route calcined at 800 °C for 2 h. While using powder X-ray diffraction (PXRD) measurements it has been observed that there is a structural transformation from monoclinic to cubic phase, which is stabilized in 10.0 mol% of Ho doped HfO2 NPs. The elements analysis and morphology of the synthesized NPs are examined by FESEM-EDX. The presence of the water-related bonds in the samples is confirmed by FTIR spectroscopy. Raman measurement shows that the crystalline phase of monoclinic to cubic phase transformation and the evidence to the XRD. Photoluminescence spectra of Holmium dopant showed the characteristics peak of strong two green emission bands. The photoluminescence result indicates that the maximum emission occurs at a concentration of 2.5 mol% for Ho3+, which correlates with TL response. The defects/trap state of Ho doped of HfO2 NPs was identified using TL glow curve by 15 MV X-ray photon beam and this trap information is referred to by its kinetic parameters such as its activation energy, frequency factor, and order of kinetics which is determined by Glow Fit software. Ho (2.5 mol%): HfO2 NPs shows the best possible concentration for emission higher Integral TL intensity and it can be used as radiation dosimeter.
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