论文部分内容阅读
Cd-rich portion of the pseudo-binary system Cd_3B_2O_6-Zn_3B_2O_6 was investigated. A new cadmium zinc borate, Cd_(2.42)Zn_(0.58)B_2O_6, 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 ?, β = 93.157°, V = 1500.7(2) ?~3, Dc = 5.683 g/cm~3, F(000) = 2301, Z = 24, R = 0.0351 and w R = 0.0741. In its structure, BO3 triangle, CdO_6 and Cd O5(or ZnO 5) polyhedra are joined together by sharing bridging O atoms to form an intricate three-dimensional framework. A comparison of the structures of Cd_(2.42)Zn_(0.58)B_2O_6, α-Cd_3B_2O_6 and β-Cd_3B_2O_6 is presented. The IR spectrum confirms the presence of BO3 unit. The UV cut-off wavelength of Cd_(2.42)Zn_(0.58)B_2O_6 is 313 nm. The differential thermal analysis(DTA) suggests that Cd_(2.42)Zn_(0.58)B_2O_6 is an incongruent melting compound.
Cd-rich portion of the pseudo-binary system Cd_3B_2O_6-Zn_3B_2O_6 was investigated. A new cadmium zinc borate, Cd_ (2.42) Zn_ (0.58) B_2O_6, was synthesized successfully by a traditional solid- space group C2 / c with a = 17.3048, b = 8.4356, c = 10.2962 ?,? = 93.157 °, V = 1500.7? 2?? 3, Dc = 5.683 g / Z = 24, R = 0.0351 and w R = 0.0741. In its structure, BO3 triangle, CdO_6 and Cd O5 (or ZnO 5) polyhedra are joined together by sharing bridging O atoms to form an intricate three-dimensional framework. the structures of Cd_ (2.42) Zn_ (0.58) B_2O_6, α-Cd_3B_2O_6 and β-Cd_3B_2O_6 are presented. The IR spectrum confirms the presence of BO3 unit. The UV cut-off wavelength of Cd_2.42 Zn_ (0.58) B_2O_6 is 313 nm. The differential thermal analysis (DTA) suggests that Cd_ (2.42) Zn_ (0.58) B_2O_6 is an incongruent melting compound.