Gadolinium p toluenesulfonate highly soluble in organic solvent was prepared and was used as the electrolyte in DMF for the first time. The electrode process of the reduction of Gd(Ⅲ) to the Gd is irreversible studi...Gadolinium p toluenesulfonate highly soluble in organic solvent was prepared and was used as the electrolyte in DMF for the first time. The electrode process of the reduction of Gd(Ⅲ) to the Gd is irreversible studied by cyclic voltammetry, chronopotentiometry. A dense film of gadolinium with metallic luster was obtained by potentiostatic electrolysis. The transfer coefficient of electrode reaction Gd(Ⅲ)+3e=Gd and the diffusion coefficient of Gd(Ⅲ) were determined as 0.35 and 2.0×10 -7 cm 2s -1 at 25℃ respectively.展开更多
A chainlike coordination polymer [Gd（dca）3（phen）2（H2O）], （dca=dicyanamide, phen=1,10-phenanthroline） has been synthesized, and its crystal structure was characterized by X-ray single-crystal diffraction. The c...A chainlike coordination polymer [Gd（dca）3（phen）2（H2O）], （dca=dicyanamide, phen=1,10-phenanthroline） has been synthesized, and its crystal structure was characterized by X-ray single-crystal diffraction. The crystal belongs to monoclinic, space group P21/n with a=10.6581（13）, b=15.6129（16）, c=17.733（3）A°,β=90.499（5）°, V=2950.8（7）A°^3, Z= , C3oH18GdN13O, Mr=733.82, De= 1.652 g/cm^3, F（000）=1444, λ（MoKα）=0.71073A°,μ=2.297 mm^-1, R=0.0258 and wR=0.0616 for 4570 observed reflections （I〉 2σ（I））. In this complex, the gadolinium atom is nine-coordinated by four dca anions, two chelated phen ligands and one H2O molecule in a distorted tricapped trigonal prism. Two bridging dca anions connect the Gd（Ⅲ） ions yielding chainlike polymers that are linked by hydrogen bonds and π-π interactions to form a three-dimensional network.展开更多
采用CALPHAD(CALculation of PHAse Diagrams)方法重新对Mg-Al-Gd三元系进行评估,获得一套自洽的热力学参数。用Mg_(x)(TM,Mg)_(6)(RE,Mg)_(8)热力学模型(TM=过渡金属,RE=稀土金属)描述长周期堆积有序相14H和18R。计算代表性的等温截面...采用CALPHAD(CALculation of PHAse Diagrams)方法重新对Mg-Al-Gd三元系进行评估,获得一套自洽的热力学参数。用Mg_(x)(TM,Mg)_(6)(RE,Mg)_(8)热力学模型(TM=过渡金属,RE=稀土金属)描述长周期堆积有序相14H和18R。计算代表性的等温截面、垂直截面、液相线投影图和相关的零变量反应,与实验数据进行比较,表明所得热力学参数的可靠性。绘制了整个三元体系的反应图,并对几种Mg-Al-Gd合金的Scheil凝固路径和相分数进行计算和分析,清楚地描述了凝固过程中各相的形成以及γ和LPSO相的相分数随Gd成分的变化,这些是影响Mg-Al-Gd合金的显微硬度、极限抗拉强度和屈服强度的重要因素。展开更多
The heterobinuclear complex of formula Cu (oxap )Gd(phen)2 (CIO4 )3 has been synthesized, where oxap denotes the N, N'-bis (2-aminopropyl )oxamido dianion and phen represents 1,10-phenanthroline. The complex was c...The heterobinuclear complex of formula Cu (oxap )Gd(phen)2 (CIO4 )3 has been synthesized, where oxap denotes the N, N'-bis (2-aminopropyl )oxamido dianion and phen represents 1,10-phenanthroline. The complex was characterized with ESR and variable temperature magnetic susceptibility (4- 300K). The least-squares fit of the experimental sosceptibilities yielded J=2. 25cm-1. The observed Gd (Ⅲ)-Cu (Ⅱ) coupling is ferromagnetic.One Plausible mechanism that can cause a ferromagnetic coupling between Gd(Ⅱ) and Cu (Ⅱ) is discussed in terms of spin-polarization.展开更多
文摘Gadolinium p toluenesulfonate highly soluble in organic solvent was prepared and was used as the electrolyte in DMF for the first time. The electrode process of the reduction of Gd(Ⅲ) to the Gd is irreversible studied by cyclic voltammetry, chronopotentiometry. A dense film of gadolinium with metallic luster was obtained by potentiostatic electrolysis. The transfer coefficient of electrode reaction Gd(Ⅲ)+3e=Gd and the diffusion coefficient of Gd(Ⅲ) were determined as 0.35 and 2.0×10 -7 cm 2s -1 at 25℃ respectively.
基金Supported by the National Natural Science Foundation of China (20201008, 50272034)
文摘A chainlike coordination polymer [Gd（dca）3（phen）2（H2O）], （dca=dicyanamide, phen=1,10-phenanthroline） has been synthesized, and its crystal structure was characterized by X-ray single-crystal diffraction. The crystal belongs to monoclinic, space group P21/n with a=10.6581（13）, b=15.6129（16）, c=17.733（3）A°,β=90.499（5）°, V=2950.8（7）A°^3, Z= , C3oH18GdN13O, Mr=733.82, De= 1.652 g/cm^3, F（000）=1444, λ（MoKα）=0.71073A°,μ=2.297 mm^-1, R=0.0258 and wR=0.0616 for 4570 observed reflections （I〉 2σ（I））. In this complex, the gadolinium atom is nine-coordinated by four dca anions, two chelated phen ligands and one H2O molecule in a distorted tricapped trigonal prism. Two bridging dca anions connect the Gd（Ⅲ） ions yielding chainlike polymers that are linked by hydrogen bonds and π-π interactions to form a three-dimensional network.
基金The financial supports from the National Key Laboratory of Science and Technology on High-strength Structural Materialsthe National Natural Science Foundation of China(No.51771235)。
文摘采用CALPHAD(CALculation of PHAse Diagrams)方法重新对Mg-Al-Gd三元系进行评估,获得一套自洽的热力学参数。用Mg_(x)(TM,Mg)_(6)(RE,Mg)_(8)热力学模型(TM=过渡金属,RE=稀土金属)描述长周期堆积有序相14H和18R。计算代表性的等温截面、垂直截面、液相线投影图和相关的零变量反应,与实验数据进行比较,表明所得热力学参数的可靠性。绘制了整个三元体系的反应图,并对几种Mg-Al-Gd合金的Scheil凝固路径和相分数进行计算和分析,清楚地描述了凝固过程中各相的形成以及γ和LPSO相的相分数随Gd成分的变化,这些是影响Mg-Al-Gd合金的显微硬度、极限抗拉强度和屈服强度的重要因素。
文摘The heterobinuclear complex of formula Cu (oxap )Gd(phen)2 (CIO4 )3 has been synthesized, where oxap denotes the N, N'-bis (2-aminopropyl )oxamido dianion and phen represents 1,10-phenanthroline. The complex was characterized with ESR and variable temperature magnetic susceptibility (4- 300K). The least-squares fit of the experimental sosceptibilities yielded J=2. 25cm-1. The observed Gd (Ⅲ)-Cu (Ⅱ) coupling is ferromagnetic.One Plausible mechanism that can cause a ferromagnetic coupling between Gd(Ⅱ) and Cu (Ⅱ) is discussed in terms of spin-polarization.
