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Y 4 Al 2 O 9 (YAM) was prepared by a sol-gel process, using yttrium and aluminum citrate complexes as precursors. The sol-gel process produced single-phase YAM at 900 °C, as opposed to the conventional solid-state reaction, which led to the formation of other phases, even if at 1600 °C. The emission and excitation spectra of Eu 3+ and Tb 3+ in YAM showed the...
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