Purification and optical properties of TlBr crystals-猫眼课题宝

TlBr晶体的纯化和光学性质

DOI：

10.1016/j.nima.2009.01.022

发表时间：

2009-04

期刊：

Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment

影响因子：

1.4

通讯作者：

中科院分区：

物理与天体物理3区

文献类型：

作者：

Hu, Yunxiang;Wang, Chuan;Zheng, Zhiping;Zhou, Dongxiang;Gong, Shuping;Quan, Lin;Yu, Shijin

用化学沉淀法合成了TlBr，水热重结晶法提纯，垂直布里奇曼法生长。采用电感耦合等离子体质谱进行ppb/ppm水平的痕量元素分析。随着冷却速度的增加，杂质浓度显著降低。水热重结晶后，Ca、Fe、Mg、K、Zn、Cu、Na、Si等杂质元素的含量明显降低。此外，利用400-600和2500-20000 nm波长范围的光谱对TlBr片的光学性质进行了比较。与重结晶粉末生长的晶片相比，未净化粉末生长的晶片在450-600 nm范围内具有较大的吸收系数和较小的透过率，吸收边向较长的波长区域移动，平均红外透过率降低。

TlBr was synthesized by chemical precipitation, purified by the hydrothermal re-crystallization method, and grown by the vertical Bridgman method. Trace element analysis at ppb/ppm level was made using inductively coupled plasma mass spectroscopy. A significant reduction of the impurity concentration was observed as a function of the cooling rate. The concentrations of impurities of Ca, Fe, Mg, K, Zn, Cu, Na, and Si decreased obviously after hydrothermal re-crystallization. In addition, the optical properties of TlBr wafers were compared using spectra in the wavelength ranges of 400–600 and 2500–20000nm. Compared to the wafer grown from the re-crystallized powder, the wafer grown from the non-purified powder exhibits a large absorption coefficient and small transmission in the range of 450–600nm, a shift of the absorption edge to a longer wavelength region, and a decrease of the average IR transmittance value.