以Lu(NO3)3和NH4HCO3为原料, 采用沉淀法制备了平均粒径约为40nm的Lu2O3粉体, 以该粉体和市售的Al2O3、CeO2超细粉体为原料, 采用固相反应工艺, 经1760℃真空烧结10h, 制备出透明的Ce:LuAG陶瓷, 该透明陶瓷在可见光范围内的透过率为56%, X射线激发下的发射光谱为Ce3+的特征发射, 范围在470~650nm, 和同类单晶的光谱一致, 正好在硅光电二极管的高敏感曲线范围内, 满足于闪烁体的性能要求, 是一种有应用前景的闪烁材料.
Lu2O3 powders with an average particle size of about 40nm were produced by a precipitation methed using Lu (NO3)3 and NH4HCO3 as starting materials. The precipitation precursor is amorphous and transforms into pure Lu2O3 phase by calcining at 600℃ for 2h. The resultant Lu2O3, Al2O3 and CeO2 powders were mixed by ball milling, and then sintered into a fully transparent Ce:LuAG ceramic body by vacuum sintering at 1760℃ for 10h and annealed at 1450℃ for 20h. The resultant transparent ceramic has a uniform microstructure with an average grain size of about 4μm. The polished Ce:LuAG ceramic disk with 1.2mm
thickness is highly transparent. The transmittance in the visible region reaches 56%, which is 72% of the theoretical value. The emission spectrum at 470~650nm with the double peak structure (517nm and 552nm) excited by
X-ray is the characteristic spectrum of Ce3+ due to the 5d-4f transition, is consistent with that of LuAG:Ce single crystals, well coupled with the silicon photodiodes and satisfies the property requirements of a scintillator. Ce:LuAG transparent ceramics is a promising scintillating material.
参考文献
| [1] | Kuwano Y, Suda K, Ishizawa N, et al. J. Cryst. Growth, 2004, 260: 159--165. [2] Nikl M, Mihokova E, Mares J A, et al. Phys. Stat. Sol. (a), 2000, 181: R10--12. [3] Maresa J A, Nikla M, Beitlerovaa A, et al, Nucl. Instrum. Methods Phys. Res. A, 2005, 537: 271--275. [4] Cicillini S A, Pires A M, Serra O A. J. Alloys Compd., 2004, 374: 169--172. [5] Ogino H, Yoshikawa A, Lee J H, et al. Opt. Mater., 2004, 26: 535--539. [6] Ogino H, Yoshikawa A, Lee J H, et al. J. Cryst. Growth, 2003, 253: 314--318. [7] Yoshikawa A, Nikl M, Ogino H, et al. J. Cryst. Growth, 2003, 250: 94--99. [8] Zhou Y H, Lin J, Yu M, et al. Mater. Lett., 2002, 56: 628--636. [9] 符锡仁, 郭祝昆(FU Xi-Ren, et al). 硅酸盐学报(Journal of Inorganic Materials), 1982, 10 (1): 105--115. [10] Ikesue A, Yoshida K, Yamamoto T. J. Am. Ceram. Soc., 1997, 80 (6): 1517--1522. [11] Cheng J, Agrawal D, Zhang Y, et al. Mater. Lett., 2002, 56: 587--592. |
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