利用差热分析法研究了EuC l3-B aC l2二元系相图,发现该体系有一个固液同组成化合物3EuC l3.2B aC l2,体系相变点为950℃,EuC l360%(摩尔分数);一个异份熔化化合物2EuC l3.3B aC l2,转熔点为630℃,EuC l343.6%(摩尔分数);2个低共熔点分...利用差热分析法研究了EuC l3-B aC l2二元系相图,发现该体系有一个固液同组成化合物3EuC l3.2B aC l2,体系相变点为950℃,EuC l360%(摩尔分数);一个异份熔化化合物2EuC l3.3B aC l2,转熔点为630℃,EuC l343.6%(摩尔分数);2个低共熔点分别为320℃,EuC l351%(摩尔分数)和330℃,EuC l379%(摩尔分数)。同时探讨了相图的某些规律。展开更多
The structure of the La-LaCl_3-KCl molten system at 1223K has been investigated by computer simulation using Monte Carlo method.The partial radial distribution functions of some ion pair as well as the potential and i...The structure of the La-LaCl_3-KCl molten system at 1223K has been investigated by computer simulation using Monte Carlo method.The partial radial distribution functions of some ion pair as well as the potential and internal energy of the system at 1223K have been calculated.The results implies that about 50% of La(Ⅲ)is six coordinated and LaCl_4^(2-) tetrahedron is the predominant configuration for La(Ⅱ). It is also concluded that the distribution of free space in the molten system is not uniform.There exist many fissures and empty holes in the molten salt.展开更多
The knowledge on the ionic structure of YCl_(3)-KCl molten system is of guiding significance for the practical production of yttrium metals and yttrium alloys via molten salt electrolysis using this system as electrol...The knowledge on the ionic structure of YCl_(3)-KCl molten system is of guiding significance for the practical production of yttrium metals and yttrium alloys via molten salt electrolysis using this system as electrolyte.In this paper,the theoretical Raman spectra of the ionic groups which may exist in YCl_(3)-KCl molten system are simulated by quantum chemical calculation using Gaussian09 and Gauss View 5.0 programs based on density functional theory(DFT).Then the ionic structures of 20 mol%-60 mol%YCl_(3)-KCl molten salt systems are studied by comparing the Raman shift values of the bands in the theoretical Raman spectra of different ionic groups with the experimental spectra of this system.YCl_(6)^(3-),Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)are thought to exist in the molten system.With the increase of temperature,the relative content of YCl_(6)^(3-)ionic groups increases while those of Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)ionic groups decrease.Moreover,the"lifetime"of all ionic groups decreases within the temperature range of 692-730℃.Meanwhile,the relative contents of Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)increase with the increase of YCl_(3)content,while that of YCl_(6)^(3-)decreases.The wave function analysis of the four ionic groups(YCl_(6)^(3-),Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-),and Y_(2)Cl_(9)^(3-))is carried out by Multiwfn program.The net charge in each group,the direction of electron migration during the formation of each group,the sites where electrophilic and nucleophilic reactions are most likely to occur in each ionic group,and the order of bond breaking during chemical reactions for the four groups are obtained.展开更多
Effect of EuCl3 on the callus growth and cell ultrastructure of Rheum was studied. The effect of EuCl3 on the growth of the callus was a biphasic one, with stimulation at low concentrations, and inhibition at higher c...Effect of EuCl3 on the callus growth and cell ultrastructure of Rheum was studied. The effect of EuCl3 on the growth of the callus was a biphasic one, with stimulation at low concentrations, and inhibition at higher concentrations. The explants would die when the concentration of EuCl3 was 100 mgL-1. The stimulative effect of EuCl3 could be inhibited by calmodulin antagonistchlorpromazine. 10 mgL-1 of EuCl3 would cause variations of the cell ultrastructure.展开更多
文摘利用差热分析法研究了EuC l3-B aC l2二元系相图,发现该体系有一个固液同组成化合物3EuC l3.2B aC l2,体系相变点为950℃,EuC l360%(摩尔分数);一个异份熔化化合物2EuC l3.3B aC l2,转熔点为630℃,EuC l343.6%(摩尔分数);2个低共熔点分别为320℃,EuC l351%(摩尔分数)和330℃,EuC l379%(摩尔分数)。同时探讨了相图的某些规律。
文摘The structure of the La-LaCl_3-KCl molten system at 1223K has been investigated by computer simulation using Monte Carlo method.The partial radial distribution functions of some ion pair as well as the potential and internal energy of the system at 1223K have been calculated.The results implies that about 50% of La(Ⅲ)is six coordinated and LaCl_4^(2-) tetrahedron is the predominant configuration for La(Ⅱ). It is also concluded that the distribution of free space in the molten system is not uniform.There exist many fissures and empty holes in the molten salt.
基金financially supported by the National Natural Science Foundation of China (No.51974081)the Fundamental Research Funds for the Central Universities (No.N2225045)MOE of China and WEIQIAO Industry-Education Cooperation Project (No.2021021800102)。
文摘The knowledge on the ionic structure of YCl_(3)-KCl molten system is of guiding significance for the practical production of yttrium metals and yttrium alloys via molten salt electrolysis using this system as electrolyte.In this paper,the theoretical Raman spectra of the ionic groups which may exist in YCl_(3)-KCl molten system are simulated by quantum chemical calculation using Gaussian09 and Gauss View 5.0 programs based on density functional theory(DFT).Then the ionic structures of 20 mol%-60 mol%YCl_(3)-KCl molten salt systems are studied by comparing the Raman shift values of the bands in the theoretical Raman spectra of different ionic groups with the experimental spectra of this system.YCl_(6)^(3-),Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)are thought to exist in the molten system.With the increase of temperature,the relative content of YCl_(6)^(3-)ionic groups increases while those of Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)ionic groups decrease.Moreover,the"lifetime"of all ionic groups decreases within the temperature range of 692-730℃.Meanwhile,the relative contents of Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)increase with the increase of YCl_(3)content,while that of YCl_(6)^(3-)decreases.The wave function analysis of the four ionic groups(YCl_(6)^(3-),Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-),and Y_(2)Cl_(9)^(3-))is carried out by Multiwfn program.The net charge in each group,the direction of electron migration during the formation of each group,the sites where electrophilic and nucleophilic reactions are most likely to occur in each ionic group,and the order of bond breaking during chemical reactions for the four groups are obtained.
文摘Effect of EuCl3 on the callus growth and cell ultrastructure of Rheum was studied. The effect of EuCl3 on the growth of the callus was a biphasic one, with stimulation at low concentrations, and inhibition at higher concentrations. The explants would die when the concentration of EuCl3 was 100 mgL-1. The stimulative effect of EuCl3 could be inhibited by calmodulin antagonistchlorpromazine. 10 mgL-1 of EuCl3 would cause variations of the cell ultrastructure.
