Research On Nd～(3+): Gd₃Ga₅O₁₂ Nanopowder

In this paper Nd³⁺: Gd₃Ga₅O₁₂ (GGG) powder with homogenously dispersive and small size was prepared for fabricating Nd³⁺: Gd₃Ga₅O₁₂ transparent ceramic as the starting materials. The sol-gel method and liquid phase co-deposited method have been adopted to prepare the samples.Nd:GGG polycrystalline precursor nanopowder of transparent laser ceramics was synthesized by sol-gel method. XRD, SEM, and fluorescence spectrum were used to study Nd³⁺: GGG nanopowder. Results indicated that pH value, complex agents, reactive temperature have impact greatly the formation on stable sol-gel. XRD patterns of the samples show that the samples exhibit the cube structure, the space group is Ia3d, its lattice constant is: A=12.37A. The crystaline grain grow gradually with increasing temperature. SEM shows the powder was sphere in shape and dispersed homogeneously. Pure Nd:GGG crystals were obtained at 1000℃ for 12h. Analysis of fluorescence spectrum showed that the fluorescence emission is at 1062.7nm by Nd³⁺(⁴F_3/2→⁴I_11/2) transition. NH₄HCO₃ co-deposited method has also been adopted to prepare GGG polycrystalline powder. XRD, SEM, and fluorescence spectrum were used to characterize the polycrystalline powder. The results showed that the pure Gd₃Ga₅O₁₂ crystals were obtained at 1100℃ for 15h by co-deposited method.In addition, we have also carried out the research work on erbium doped GGG XRD and SEM analysis results are similar to that of the Nd:GGG powder. While fluorescence spectrum of the Er:GGG sample shows the emission at 1533nm due to Er³⁺ (⁴I_13/2→⁴I_15/2) transition.