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Er3+-doped Al2O3 nanopowders have been prepared by the non-aqueous sol-gel method using the aluminum isopropoxide as precursor, acetylacetone as a chelating agent, nitric acid as a catalyzer, and hydrated erbium nitrate as a dopant under isopropanol environment. The different phase structure, including three crystalline types of (Al, Er)2O3 phases, α, γ, θ, and an Er–Al–O stoichiometric compound phase,...
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