v-PrBO_3的晶体结构、相变和光学性质（英文）  

Crystal Structure,Phase Transition and Optical Properties of ν-PrBO_3

作　　者：金滕滕[1,2] 张志军[1] 张辉[1] 赵景泰[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,中国科学院透明光功能无机材料重点实验室,上海200050 [2]中国科学院大学,北京100039

出　　处：《无机材料学报》2013年第10期1153-1157,共5页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China(11104298)

摘　　要：采用高温固相合成法分别在1200和1500℃合成了λ-PrBO3和ν-PrBO3样品,并通过单晶X射线衍射确定了-PrBO3的晶体结构。结果表明该结构为三斜晶系,空间群为P 1,晶胞参数为a=0.6302(4)nm,b=0.6521(4)nm,c=0.6525(4)nm,α=94.312(7)o,β=107.335(7)o,γ=106.455(7)o,V=0.2417(2)nm3,Z=4。同时研究了从λ-PrBO3到ν-PrBO3的相变过程,并从漫反射光谱得出λ-PrBO3和ν-PrBO3的光学带隙均为4.96 eV。在X射线和紫外激发下,均未观测到λ-PrBO3和ν-PrBO3样品在紫外可见波长范围内的Pr3+特征发光。The praseodymium orthoborates λ-PrBO3 and ν-PrBO3 were synthesized from Pr6Oi1 and H3BO3 by solid state reaction method at 1200 and 1500℃, respectively. The crystal structure of v-PrBO3 was refined on the basis of single-crystal X-ray diffraction data. It crystallizes in the triclinic system belonging to space group P T with lattice pa- rameters： a = 0.6302 （4） nm, b = 0.6521 （4） nm and c = 0.6525 （4） nm, and a = 94.312（7）°, β = 107.335（7）°, y = 106.455（7）°, V= 0.2417（2） nm3, Z = 4. The phase transition process from rBO3 was also investigated. The optical band gaps of L-PrBO3 and v-PrBO3 are both determined to be about 4.96 eV according to the diffuse re- flection spectra. There is no emission of Pr3＋ in the visible range for both of λ-PrBO3 and v-PrBO3 trader X-ray and UV excitation.

关 键 词：ν-PrBO3晶体结构 相变 光学性质 

分 类 号：O78[理学—晶体学]