The influence of Ti, B, RE (cerium-rich mixtures of rare earth) and Sr, applied in modification and refining processes, on A356 aluminum alloys has been studied with the aids of OM, etc. The results show that the grai...The influence of Ti, B, RE (cerium-rich mixtures of rare earth) and Sr, applied in modification and refining processes, on A356 aluminum alloys has been studied with the aids of OM, etc. The results show that the grain refining efficiency of Grain-Refining Aluminium Ingot (GRAI) and Al-Ti master alloys is similar. But the Tiaddition from GRAI has lower costs than that with Al-Ti master alloys. So A356 aluminum alloys produced with GRAI are feasible in economy. Grain refining with GRAI with 0.01%Ti plus additional 0.03% B offers significant advantages over that from GRAI with 0.1% Ti only in A356 aluminum alloys, which made the dendrite α(Al) grain structure transform into equiaxed α(Al) grain structure, plus a partially modified eutectic silicon structure. RE addition to A356 aluminum alloys with Sr modifier is enable to achieve small DAS, reduced pores, well-refined fibrous silicon, small and dispersive eutectic colonies.展开更多
A novel tetra-nuclear Nd(Ⅲ) coordination polymer, Nd4(μ3-OH)4(μ2-H2O)2(C6H4NO2)6(N3)2(H2O)2(1, C6H4N zide anion), was successfully prepared under hydrothermal conditions and fully characterized by C, H and N elemen...A novel tetra-nuclear Nd(Ⅲ) coordination polymer, Nd4(μ3-OH)4(μ2-H2O)2(C6H4NO2)6(N3)2(H2O)2(1, C6H4N zide anion), was successfully prepared under hydrothermal conditions and fully characterized by C, H and N elemental analysis, IR spectrum, thermal stability and single-crystal X-ray diffraction. It crystallizes in the triclinic system, space group P1, with Z = 1, a = 8.188(3), b = 12.516(5), c = 12.573(5) ?, α = 107.887(1)°, β = 104.681(2)°, γ = 98.086(6)°, V = 1152.2(8) ?3, M3 r = 1533.73, Dc = 2.210 g/cm, λ = 0.71073 ?, μ = 4.524 mm-1, F(000) = 736, R = 0.0332 and wR = 0.0901 for 3954 observed reflections with Ⅰ > 2σ(Ⅰ) and S = 1.071. The molecular structure of polymer 1 is constructed by four Nd3+ cations, four bridging μ3-OH- anions, two bridging μ2-H2 O, six C6 H4 NO2- anions, two linear azide anions and two coordinated water molecules. The structure of polymer 1 can be viewed as a 3-D supra-molecular network constructed by O-H···O and O-H···N hydrogen bonds between the adjacent chains. Moreover, its near-infrared luminescence and luminescence quenching for Cu2+ cation have also been investigated in detail.展开更多
A new binuclear cobalt(Ⅱ)complex,[Co2(C10H6NO2)2(C12H8N2)2(N3)2]·H2O(1,C10H6NO2-:isoquinoline-1-carboxylate,C12H8N2:1,10-phenanthroline(phen);N3-:azide),has been synthesized though a mixed-solvothermal method us...A new binuclear cobalt(Ⅱ)complex,[Co2(C10H6NO2)2(C12H8N2)2(N3)2]·H2O(1,C10H6NO2-:isoquinoline-1-carboxylate,C12H8N2:1,10-phenanthroline(phen);N3-:azide),has been synthesized though a mixed-solvothermal method using the pentanol and distilled water as solvent.The complex was characterized by elemental analysis,IR spectrum and single-crystal X-ray diffraction.It crystallizes in triclinic system,space group P1 with Z=2,a=1.777(5),b=11.815(5),c=17.141(7)?,α=74.496(6)°,β=70.537(6)°,γ=67.861(6)°,V=2055.4(14)?3,Mr=922.66,Dc=1.491 g/cm3,λ=0.71073?,μ=0.870 mm-1,F(000)=942,R=0.0455 and wR=0.1147 for 4960 observed reflections with I>2σ(I)and S=1.129.Its molecular structure is constructed by two Co2+cations,two chelating phen ligands,two chelating isoquinoline-1-carboxylate ligands,two bridging linear azide anions and two uncoordinated half-occupied water molecules.The 3-D supramolecular network results from the multiple hydrogen bonds andπ-πstacking interactions among three types of ligands.More importantly,its thermal stability,luminescent properties and magnetic properties have also been studied in detail.展开更多
文摘The influence of Ti, B, RE (cerium-rich mixtures of rare earth) and Sr, applied in modification and refining processes, on A356 aluminum alloys has been studied with the aids of OM, etc. The results show that the grain refining efficiency of Grain-Refining Aluminium Ingot (GRAI) and Al-Ti master alloys is similar. But the Tiaddition from GRAI has lower costs than that with Al-Ti master alloys. So A356 aluminum alloys produced with GRAI are feasible in economy. Grain refining with GRAI with 0.01%Ti plus additional 0.03% B offers significant advantages over that from GRAI with 0.1% Ti only in A356 aluminum alloys, which made the dendrite α(Al) grain structure transform into equiaxed α(Al) grain structure, plus a partially modified eutectic silicon structure. RE addition to A356 aluminum alloys with Sr modifier is enable to achieve small DAS, reduced pores, well-refined fibrous silicon, small and dispersive eutectic colonies.
基金Project supported by the National Natural Science Foundation of China (No. 21601095)。
文摘A novel tetra-nuclear Nd(Ⅲ) coordination polymer, Nd4(μ3-OH)4(μ2-H2O)2(C6H4NO2)6(N3)2(H2O)2(1, C6H4N zide anion), was successfully prepared under hydrothermal conditions and fully characterized by C, H and N elemental analysis, IR spectrum, thermal stability and single-crystal X-ray diffraction. It crystallizes in the triclinic system, space group P1, with Z = 1, a = 8.188(3), b = 12.516(5), c = 12.573(5) ?, α = 107.887(1)°, β = 104.681(2)°, γ = 98.086(6)°, V = 1152.2(8) ?3, M3 r = 1533.73, Dc = 2.210 g/cm, λ = 0.71073 ?, μ = 4.524 mm-1, F(000) = 736, R = 0.0332 and wR = 0.0901 for 3954 observed reflections with Ⅰ > 2σ(Ⅰ) and S = 1.071. The molecular structure of polymer 1 is constructed by four Nd3+ cations, four bridging μ3-OH- anions, two bridging μ2-H2 O, six C6 H4 NO2- anions, two linear azide anions and two coordinated water molecules. The structure of polymer 1 can be viewed as a 3-D supra-molecular network constructed by O-H···O and O-H···N hydrogen bonds between the adjacent chains. Moreover, its near-infrared luminescence and luminescence quenching for Cu2+ cation have also been investigated in detail.
基金Project supported by the National Natural Science Foundation of China (No. 21601095)。
文摘A new binuclear cobalt(Ⅱ)complex,[Co2(C10H6NO2)2(C12H8N2)2(N3)2]·H2O(1,C10H6NO2-:isoquinoline-1-carboxylate,C12H8N2:1,10-phenanthroline(phen);N3-:azide),has been synthesized though a mixed-solvothermal method using the pentanol and distilled water as solvent.The complex was characterized by elemental analysis,IR spectrum and single-crystal X-ray diffraction.It crystallizes in triclinic system,space group P1 with Z=2,a=1.777(5),b=11.815(5),c=17.141(7)?,α=74.496(6)°,β=70.537(6)°,γ=67.861(6)°,V=2055.4(14)?3,Mr=922.66,Dc=1.491 g/cm3,λ=0.71073?,μ=0.870 mm-1,F(000)=942,R=0.0455 and wR=0.1147 for 4960 observed reflections with I>2σ(I)and S=1.129.Its molecular structure is constructed by two Co2+cations,two chelating phen ligands,two chelating isoquinoline-1-carboxylate ligands,two bridging linear azide anions and two uncoordinated half-occupied water molecules.The 3-D supramolecular network results from the multiple hydrogen bonds andπ-πstacking interactions among three types of ligands.More importantly,its thermal stability,luminescent properties and magnetic properties have also been studied in detail.
