Optical properties of natural pyralspite garnets: The effect of electron beam irradiation
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Almandine, pyrope and spessartine garnets were investigated. The samples were irradiated with 10 MeV electron energy tofluencies of 2 × 1017 cm-2 for one hour. After irradiation, the Cr3+ ion absorption band decreased but the Fe2+ ion increased inthe UV-visible and Fourier transform infrared (FT-IR) spectra of pyrope garnets. In the spessartine samples, the absorptionbands of Mn2+ decreased but Fe2+ increased. However, there was no significant change in the almandine garnet spectra. Electron paramagnetic resonance (EPR) was used to measure the changes in the electrovalence of the pyrope and spessartinegarnets after irradiation. Pyrope garnets exhibited two peaks, a peak near g~1.98 attributed to Cr3+ in the octahedral positionand a peak near g~2.01 attributed to Fe3+ in the octahedral position. Spessartine garnets had only one peak near g~2.04,attributed to Fe3+ in the octahedral position.
Abstract
Almandine, pyrope and spessartine garnets were investigated. The samples were irradiated with 10 MeV electron energy tofluencies of 2 × 1017 cm-2 for one hour. After irradiation, the Cr3+ ion absorption band decreased but the Fe2+ ion increased inthe UV-visible and Fourier transform infrared (FT-IR) spectra of pyrope garnets. In the spessartine samples, the absorptionbands of Mn2+ decreased but Fe2+ increased. However, there was no significant change in the almandine garnet spectra. Electron paramagnetic resonance (EPR) was used to measure the changes in the electrovalence of the pyrope and spessartinegarnets after irradiation. Pyrope garnets exhibited two peaks, a peak near g~1.98 attributed to Cr3+ in the octahedral positionand a peak near g~2.01 attributed to Fe3+ in the octahedral position. Spessartine garnets had only one peak near g~2.04,attributed to Fe3+ in the octahedral position.
참고문헌 (15)
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