Effect of 10 MeV electron irradiation on hydroxyapatite (HAP)

To understand the impact of radiation doses, polycrystalline hydroxyapatite (HAP) samples were exposed to 10 MeV electron irradiation, reaching doses of up to 20 MGy and their structural–thermal–optical properties were compared with unirradiated sample by using powder X–ray diffraction (XRD), energy...

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Bibliographic Details
Published inBulletin of materials science Vol. 47; no. 3; p. 170
Main Authors Raj, Athira K V, Banerjee, Rumu H, Sengupta, P
Format Journal Article
LanguageEnglish
Published Bangalore Indian Academy of Sciences 23.07.2024
Springer Nature B.V
Subjects
Charge transfer
Chemistry and Materials Science
Doppler effect
Electron irradiation
Engineering
Excitation spectra
Fourier transforms
Hydroxyapatite
Infrared analysis
Lattice vacancies
Materials Science
Morphology
Nuclear power plants
Optical properties
Oxygen
Particle size
Phase stability
Photoluminescence
Radiation
Radiation dosage
Radioactive wastes
Red shift
Scanning electron microscopy
Surface defects
Surface stability
Thermogravimetric analysis
defect luminescence
electron beam irradiation
Hydroxyapatite (HAP)
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Summary:To understand the impact of radiation doses, polycrystalline hydroxyapatite (HAP) samples were exposed to 10 MeV electron irradiation, reaching doses of up to 20 MGy and their structural–thermal–optical properties were compared with unirradiated sample by using powder X–ray diffraction (XRD), energy-dispersive X–ray fluorescence (EDXRF), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and photoluminescence (PL) measurements. The results suggest that the samples exhibit high-phase stability, though irradiation induces the formation of surface defects and oxygen vacancies, while leaving morphology unchanged. It was noted that the lattice contracts, leading to reduced bond lengths and an increase in bond covalency, consequently resulting in a decrease in charge transfer (CT) energy. This nephelauxetic (covalency) effect is associated with a red shift observed in the excitation spectrum. Additionally, a noticeable enhancement of luminescence intensity was exhibited by HAP-1MGy sample attribute to the structured alignment of defects and oxygen vacancies within the lattice. These findings imply the exceptional radiation durability of HAP even after exposure to high electron-irradiation doses.
ISSN:0973-7669
0250-4707
0973-7669
DOI:10.1007/s12034-024-03257-6