论文部分内容阅读
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 samples of λ-PrBO3 and ν-PrBO3 were synthesized by high temperature solid-state synthesis at 1200 and 1500 ℃, respectively, and the crystal structure of -PrBO3 was confirmed by single crystal X-ray diffraction. The results show that the structure is triclinic, the space group is P 1, the unit cell parameters are a = 0.6302 (4) nm, b = 0.6521 (4) nm, c = o, β = 107.335 (7) o, γ = 106.455 (7) o, V = 0.2417 (2) nm3, Z = 4. The phase transition from λ-PrBO3 to ν-PrBO3 was also investigated. The optical band gaps of λ-PrBO3 and ν-PrBO3 were 4.96 eV from the diffuse reflectance spectra. Under both X-ray and UV excitation, no Pr3 + emission of the λ-PrBO3 and ν-PrBO3 samples was observed in the UV-visible range.