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采用共沉淀法,以NH4OH为沉淀剂制备了1%(原子分数)Nd3+:Gd3Sc2Al3O12前驱体,并在不同的温度下对前驱体进行煅烧。用X射线衍射(XRD)和红外光谱(FT-IR)技术对前驱体及煅烧后粉体的结构、微观形貌进行了研究。结果表明,前驱体在1000℃下煅烧可获得纯GSAG多晶相粉体。用X射线衍射宽化法估算粉体的平均晶粒尺寸为25 nm。通过X射线粉末衍射,用Rietveld全谱拟合方法对晶体结构进行了精修,得到1000℃下煅烧所得Nd:GSAG粉体的晶胞参数为a=b=c=1.24164(5)nm,α=β=γ=90°。在室温下,测定了激发波长为808nm的发射谱和检测波长为942 nm的激发谱。另外,测定了942和1064 nm处的荧光衰减曲线,并用单指数函数进行了拟合,得到对应的荧光寿命分别为0.529和0.512 ms。
The coprecipitation method was used to prepare 1% (atomic fraction) Nd3 +: Gd3Sc2Al3O12 precursor with NH4OH as precipitating agent, and the precursor was calcined at different temperatures. The structure and microstructure of precursor and calcined powder were studied by X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). The results show that the pure GSAG polycrystalline powder can be obtained by calcining the precursor at 1000 ℃. The average grain size of the powder was estimated to be 25 nm by XRD. The crystal structure was refined by X-ray powder diffraction and Rietveld full-spectrum fitting method. The unit cell parameters of Nd: GSAG powder calcined at 1000 ℃ are a = b = c = 1.24164 (5) nm, α = β = γ = 90 °. At room temperature, the emission spectrum at excitation wavelength of 808 nm and the excitation spectrum at 942 nm were measured. In addition, the fluorescence decay curves at 942 and 1064 nm were measured and fitted with a single exponential function, resulting in corresponding fluorescence lifetime of 0.529 and 0.512 ms, respectively.