Phase structure and vibrational spectra of rare-earth-oxide ceramics of Dy2(1−x)Tm2xO3
Phase structure and vibrational spectra of rare-earth-oxide ceramics of Dy2(1−x)Tm2xO3
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Dy2(1−x)Tm2xO3 稀土氧化物陶瓷的相结构和振动光谱
DOI：
10.1007/s10853-011-5948-z
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发表时间：
2012
影响因子：
4.5
通讯作者：
Ji Zhou
中科院分区：
文献类型：
--
作者：
Xiaojian Fu;Yuanda Xu;Ji Zhou
稀土倍半氧化物陶瓷由于其优异的物理化学性能和低廉的成本在固体激光器中具有潜在的应用前景。本文采用球磨法制备了Dy2(1−x)Tm2xO3复合粉体，并采用无压烧结技术制备了相应的陶瓷。利用x射线衍射仪、拉曼光谱仪和傅里叶红外光谱仪研究了相结构和振动光谱。结果表明，在1100℃热处理4 h后，Dy2O3和Tm2O3的混合物转变为有序的体心立方结构固溶体，陶瓷的胞体常数随Tm2O3含量的增加而线性降低。拉曼光谱分析表明，键长在高频范围内对拉曼谱带的频率起主要作用，并且随着Tm2O3含量的增加，由于胞常数的降低，峰值位置呈现蓝移。在红外光谱中也观察到类似的现象，随着细胞体积的减小，红外波段频率呈线性增加。本文所采用的球磨法制备复合粉体及振动谱分析，为Dy2O3和Tm2O3激光陶瓷的研究提供了重要的参考。
Rare-earth-sesquioxide ceramics have been found to possess potential applications in solid-state lasers due to their excellent physical and chemical properties as well as low cost. In this paper, composite powders with the composition of Dy2(1−x)Tm2xO3 were prepared by ball milling method and corresponding ceramics were obtained using the pressureless sintering technique. Phase structure and vibrational spectra were investigated using X-ray diffraction, Raman spectrometer, and FT-IR spectrometer. It is shown that the mixture of Dy2O3 and Tm2O3 converts to an ordered solid solution of body-centered cubic structure after heat treatment at 1,100 °C for 4 h. It is also found that the cell constants of ceramics decrease linearly with the increase of Tm2O3 content. Raman spectra analysis demonstrates that bond length plays a major role in determining the frequencies of Raman bands at high-frequency range and that peak positions exhibit a blue shift with the increase of Tm2O3 content due to decreasing cell constant. Similar phenomenon is also observed in infrared spectra, which shows linearly increasing infrared band frequency with decreasing cell volume. The ball milling method used for preparing composite powders and vibrational spectra analysis in this work provide some important references for the study of laser ceramics containing Dy2O3 and Tm2O3.