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- W2078354930 abstract "We synthesized Cr doped Al2O3 ultrafine particles by the metal-alkoxide method at several heat treatment temperatures. The crystal structure changes from pseudoboehmite to α-Al2O3 through a few metastable structures as the heat treatment temperature increases. The optical absorption and the emission spectra reflect their crystal configuration around the Cr3+ site. The absorption bands of 4A2 → 4T2 and 4A2 → 4T1 transition shift to the blue side. The emission from Δ-Al2O3 is composed of the 2E → 4A2 and the 4T2 → 4A2 transitions, and the relative intensity of these spectra changes with the exciting wavelength. We also made Nd and Cr doped Al2O3 and studied energy transfer between these ions." @default.
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- W2078354930 date "1987-06-01" @default.
- W2078354930 modified "2023-10-18" @default.
- W2078354930 title "Optical study of Cr doped Al2O3 ultrafine particles synthesized by metal-alkoxide method" @default.
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- W2078354930 doi "https://doi.org/10.1016/0038-1098(87)90205-5" @default.
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