A new zero-dimensional(0D) thioborate compound Ba(13)(BS3)6(SnS6), the first one in the AE/B/Sn/Q(AE=alkali-earth metals; Q=S, Se, Te) family, has been synthesized by conventional high-temperature solid-stat...A new zero-dimensional(0D) thioborate compound Ba(13)(BS3)6(SnS6), the first one in the AE/B/Sn/Q(AE=alkali-earth metals; Q=S, Se, Te) family, has been synthesized by conventional high-temperature solid-state reaction. It crystallizes in the trigonal space group of R3(No. 148) with a=b=21.4634(6) , c=8.3653(5) , V=3337.4(2) 3, Z=3, Mr=2738.41, Dc=4.088 g/cm3, μ=12.977 mm(-1), F(000)=3576, the final R=0.0208 and w R=0.0505 with I 〉 2σ(I), 3.28〈θ〈27.49°, w=1/[σ2(Fo2) +(0.0253P)2 + 0.0000P], where P =(Fo2 + 2Fc2)/3, S=1.051,(Δρ)max=0.639 and(Δρ)min=–1.195 e/3. The structure is constructed by discrete [BS3](3–) trigonal planes and isolated [SnS6](8–) octahedra with Ba(2+) cations filled among them. The IR spectrum indicates the presence of lighter element boron. Its optical band gap shown by the UV-Vis-near-IR spectrum is about 2.69 e V, which agrees well with the electronic structure calculation.展开更多
The mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr(NO_3)_2 in graphite furnace AAS were discussed.X-ray diffraction and thermodynamic calculation were applied to study t...The mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr(NO_3)_2 in graphite furnace AAS were discussed.X-ray diffraction and thermodynamic calculation were applied to study the mechanism of boron atomization with and without matrix mo- difier Sr(NO_3)_2.The formation of boron atom is due to the sublimation of solid boron which derived from the reduction of B_2O_3 by carbon.The enhancement of boron signal in the presence of Sr(NO_3)_2 is due to the formation of SrB_6 before atomization,which decreased the volatization losses of B_2O_3 and retarded the formation of B_4C.展开更多
基金supported by the National Natural Science Foundation of China(21233009,21225104,91422303,21301175 and 21171168)
文摘A new zero-dimensional(0D) thioborate compound Ba(13)(BS3)6(SnS6), the first one in the AE/B/Sn/Q(AE=alkali-earth metals; Q=S, Se, Te) family, has been synthesized by conventional high-temperature solid-state reaction. It crystallizes in the trigonal space group of R3(No. 148) with a=b=21.4634(6) , c=8.3653(5) , V=3337.4(2) 3, Z=3, Mr=2738.41, Dc=4.088 g/cm3, μ=12.977 mm(-1), F(000)=3576, the final R=0.0208 and w R=0.0505 with I 〉 2σ(I), 3.28〈θ〈27.49°, w=1/[σ2(Fo2) +(0.0253P)2 + 0.0000P], where P =(Fo2 + 2Fc2)/3, S=1.051,(Δρ)max=0.639 and(Δρ)min=–1.195 e/3. The structure is constructed by discrete [BS3](3–) trigonal planes and isolated [SnS6](8–) octahedra with Ba(2+) cations filled among them. The IR spectrum indicates the presence of lighter element boron. Its optical band gap shown by the UV-Vis-near-IR spectrum is about 2.69 e V, which agrees well with the electronic structure calculation.
文摘The mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr(NO_3)_2 in graphite furnace AAS were discussed.X-ray diffraction and thermodynamic calculation were applied to study the mechanism of boron atomization with and without matrix mo- difier Sr(NO_3)_2.The formation of boron atom is due to the sublimation of solid boron which derived from the reduction of B_2O_3 by carbon.The enhancement of boron signal in the presence of Sr(NO_3)_2 is due to the formation of SrB_6 before atomization,which decreased the volatization losses of B_2O_3 and retarded the formation of B_4C.