摘要
Cd-rich portion of the pseudo-binary system Cd3B2O6-Zn3B2O6 was investigated. A new cadmium zinc borate, Cd2.42Zn0.58B2O6, was synthesized successfully by a traditional solid-state reaction method. The compound crystallizes in the monoclinic space group C2/c with a = 17.3048, b = 8.4356, c = 10.2962 A^°, β = 93.157°, V = 1500.7（2） A^°3, Dc = 5.683 g/cm^3, F（000） = 2301, Z = 24, R = 0.0351 and wR = 0.0741. In its structure, BO3 triangle, CdO6 and CdO5 （or ZnO5） polyhedra are joined together by sharing bridging O atoms to form an intricate three-dimensional framework. A comparison of the structures of Cd2.42Zn0.58B2O6, α-Cd3B2O6 and β-Cd3B2O6 is presented. The IR spectrum confirms the presence of BO3 unit. The UV cut-off wavelength of Cd2.42Zn0.58B2O6 is 313 nm. The differential thermal analysis （DTA） suggests that Cd2.42Zn0.58B2O6 is an incongruent melting compound.
Cd-rich portion of the pseudo-binary system Cd3B2O6-Zn3B2O6 was investigated. A new cadmium zinc borate, Cd2.42Zn0.58B2O6, was synthesized successfully by a traditional solid-state reaction method. The compound crystallizes in the monoclinic space group C2/c with a = 17.3048, b = 8.4356, c = 10.2962 A^°, β = 93.157°, V = 1500.7（2） A^°3, Dc = 5.683 g/cm^3, F（000） = 2301, Z = 24, R = 0.0351 and wR = 0.0741. In its structure, BO3 triangle, CdO6 and CdO5 （or ZnO5） polyhedra are joined together by sharing bridging O atoms to form an intricate three-dimensional framework. A comparison of the structures of Cd2.42Zn0.58B2O6, α-Cd3B2O6 and β-Cd3B2O6 is presented. The IR spectrum confirms the presence of BO3 unit. The UV cut-off wavelength of Cd2.42Zn0.58B2O6 is 313 nm. The differential thermal analysis （DTA） suggests that Cd2.42Zn0.58B2O6 is an incongruent melting compound.
基金
supported by the Special Foundation for Young Scientists of Beijing(No.2014000020124G009)
