水热法合成掺Mn橙色刚玉晶体

Hydrothermal Synthesis of Al_2O_3 : Mn Crystal

本文采用水热法 ,在 4 30℃、4 0MPa的压力下合成出了纯α Al2 O3 晶体。在同样的条件下 ,通过掺入Mn(NO3 ) 2合成了掺Mn橙红色刚玉晶体。掺入Mn(NO3 ) 2 时 ,合成产物有两种晶体 ,一种是无色刚玉晶体 ,体积较小 ,为六棱柱状 ,直径 30～ 4 0 μm ,高为 30～ 4 0 μm。另一种晶体为橙红色掺Mn刚玉晶体 ,其外形轮廓近乎球形 ,晶体表面有十分粗糙的生长阶梯 ,台阶高度为 2～ 5 μm ,晶体高 2 0 0～ 30 0 μm ,直径 2 0 0～ 30 0 μm。

In this paper, the pure α-Al_2O_3 crystal was synthesized by hydrothermal method at 430℃ and 40 MPa. The salmon pink Mn doped α-Al_2O_3 crystal was synthesized by doping Mn(NO_3)_2 in the precursors under the same condition. The resultant consists of two kinds of crystals. One is colorless pure α-Al_2O_3 crystal in the shape of hexagonal prism with a diameter from 30μm to 40μm and height from 30μm to 40μm, its bulk is on the small side;the other is orange-red Mn doped α-Al_2O_3 crystal. Its shape is close to sphere and the interface morphology appears rough ladder-shape, the height of ladder steps is 2-5μm.The height of the crystal is 200-300μm, and the diameter is 200-300 μm.