中文摘要：

通过氨水加碳酸氢铵复合沉淀剂合成了Nd3＋掺杂的氧化镥纳米晶粉体。经马弗炉900℃煅烧2h，获得了分散性好、晶粒尺寸约为40nln的高质量的Nd：Lu2O3纳米晶粉体。采用无压流动H2气氛对所得素坯进行两步烧结致密化（T1=1720℃，T2=1620℃）获得了半透明的纳米Lu2O3陶瓷。荧光光谱表明在808nm波长激发下，纳米陶瓷发光强度明显超过微米级陶瓷。同步辐射研究表明，随着晶粒尺寸减小，纳米陶瓷中Nd原子的局域环境混乱度增大，无序度相对变大。在Nd掺杂浓度相同情况下，对同一光子能量的X射线吸收系数纳米陶瓷小于微米级陶瓷。

英文摘要：

Nd doped Lu2 03 nanocrystalline powders were synthesized by a wet chemical processing derived by mixed solution of NH4OH ＋ NH4HCO3. The powders are uniform and the average size is about 40 nm. Green compacts were sintered in flowing H2 atmosphere by two-step sintering at T1 = 1720 %, T2 = 1620 ℃ for 12 h. Translucent nano-ceramic was obtained, which present a stronger luminescent intensity in fluorescence spectrum, comparing to the micron ceramic. EXAFS research showed that with decreasing grain size, higher degree of disorder factor of the local environment of Nd atoms doped in the nano- ceramic was discovered. The nano-ceramic X-ray absorption coefficient of the same photon energy is less than a micron ceramic.