The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 8-hydroxyquinoline-5-sulphonic acid in the presence of diethylamine and ethanol have been measured by normal and third-de...The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 8-hydroxyquinoline-5-sulphonic acid in the presence of diethylamine and ethanol have been measured by normal and third-derivative spectrophotometry. Their molar absorptivities are 70.7 l.mol^(-1).cm^(-1) for Nd and 62.5 l.mol^(-1).cm^(-1) for Er. They are 7.6 times and 14.9 times greater than those of corresponding chlorides, respectively. Use of the third-derivative spectra both eliminates the interference of Ce(Ⅳ) and increases the sensitivity for Nd and Er. Beer,s Law was obeyed from 0-10 ug/ml of Nd and Er. The method has been applied to the determination of neodymium and erbium in rare earth mixtures.展开更多
The active mechanisms of rare earth element erbium ( Er ) in part of aluminum alloys were investigated. Based on the investigation of the effect of the unitary rare earth elements (Er, La, Y, Ce, Nd, Gd, and Sc) and t...The active mechanisms of rare earth element erbium ( Er ) in part of aluminum alloys were investigated. Based on the investigation of the effect of the unitary rare earth elements (Er, La, Y, Ce, Nd, Gd, and Sc) and the transition element zirconium on the aluminum alloys, it is concluded that, with Er alloyed, high purity aluminum and Al Mg alloys are featured with refined grain structure, superior heat stability and even higher hardness or tensile strength with unchanged ductility; but Er is not beneficial to the mechanical property of Al Cu alloy, so is Sc. It may also be concluded, to most of the aluminum alloys, Er can be an effective alloying element, like Sc; and for the lower price of Er, the cost of modifying aluminum alloys by Er will be reduced.展开更多
The sample preparation technique for a mixed rare earth (MRE)Er-Ba-Cu-O system by solid-state reaction method with the MRE-oxide containing 68.22% Er2O3 is reported in this paper. The results of superconductivity meas...The sample preparation technique for a mixed rare earth (MRE)Er-Ba-Cu-O system by solid-state reaction method with the MRE-oxide containing 68.22% Er2O3 is reported in this paper. The results of superconductivity measurements, crystal structure analysis by means of X-ray powder diffraction and scanning electron microscope (SEM) analysis are also presented.展开更多
In order to investigate the effect of erbium （Er） on the microstructure of orthorhombic Ti2A1Nb-based alloys, four testing alloys were prepared by adding differ- ent contents of the rare earth metal Er to Ti-22A1-25...In order to investigate the effect of erbium （Er） on the microstructure of orthorhombic Ti2A1Nb-based alloys, four testing alloys were prepared by adding differ- ent contents of the rare earth metal Er to Ti-22A1-25Nb alloy and optical microscopy, X-ray diffraction, scanning electron microscopy, electron probe microanalysis, energy- dispersive spectrometry, and transmission electron microscopy were used. The results show that the addition of Er is capable of grain refining and the refinement effect is more obvious with increasing content of Er. The Er203 dispersoids formed by internal oxidation and A13Er com- pound particles are observed in Er-doped alloys and the number of Er precipitates is increased with increasing Er addition. It is likely that the solubility of Er in the Ti2A1Nb alloy is very low and Er precipitates tend to segregate at grain boundaries, which together with the surface activity of rare earth elements is supposed to decrease the prior B2 grain size of Ti-22A1-25Nb alloy effectively.展开更多
The sorption behavior and mechanism of a novel macroporous weak acid resin(D113 resin) for Er(Ⅲ) were investigated. The optimal sorption condition of D113 resin for Er(Ⅲ) was pH 6.42 in HAc-NaAc medium. The statical...The sorption behavior and mechanism of a novel macroporous weak acid resin(D113 resin) for Er(Ⅲ) were investigated. The optimal sorption condition of D113 resin for Er(Ⅲ) was pH 6.42 in HAc-NaAc medium. The statically saturated sorption capacity was 272 mg·g-1 at 298 K in HAc-NaAc medium. The Er(Ⅲ) adsorbed on D113 resin could be reductively eluted by the mixed solution of HCl and NaCl. The elution percentage could reach 100%. The resin could be regenerated and reused without apparent decrease of sorption capacity. The apparent sorption rate constant was k298=1.98×10-5 s-1. The apparent activation energy was 8.60 kJ·mol-1. The sorption behavior of D113 resin for Er(Ⅲ) obeyed the Freundlich isotherm and Langmuir isotherm. The sorption parameters of thermodynamics were ΔH=44.0 kJ·mol-1, ΔS=223 J·mol-1·K-1, ΔG298 K=-22.3 kJ·mol-1, respectively. The molar coordination ratio of the functional group of D113 resin to Er(Ⅲ) was 3∶1. The sorption mechanism of D113 resin for Er(Ⅲ) was examined using chemical method and IR spectrometry.展开更多
The adsorption and desorption behaviors of Er(Ⅲ) ion on D113-Ⅲ resin were investigated.Batch adsorption studies were carried out with various Er(Ⅲ) ion concentrations,pH,contact time and temperature,indicating that...The adsorption and desorption behaviors of Er(Ⅲ) ion on D113-Ⅲ resin were investigated.Batch adsorption studies were carried out with various Er(Ⅲ) ion concentrations,pH,contact time and temperature,indicating that D113-Ⅲ resin could adsorb Er(Ⅲ) ion effectively from aqueous solution.The loading of Er(Ⅲ) ion onto D113-Ⅲ resin increased with increasing the initial concentration.The adsorption was strongly dependent on pH of the medium with enhanced adsorption as the pH turned from 3.45 to 6.75.In the batch s...展开更多
Three polymeric erbium(Ⅲ) complexes [Er(oba)(Hoba)(H 2O) 2]H 2O (A),[Er 2(oba) 3(H 2O) 4] (B), [Er 2(oba) 3(2,2′ bpy) 2] (C) (H 2oba=4,4′ oxybis(benzoic acid), 2,2′ bpy = 2,2′ bipyridine) were hydr...Three polymeric erbium(Ⅲ) complexes [Er(oba)(Hoba)(H 2O) 2]H 2O (A),[Er 2(oba) 3(H 2O) 4] (B), [Er 2(oba) 3(2,2′ bpy) 2] (C) (H 2oba=4,4′ oxybis(benzoic acid), 2,2′ bpy = 2,2′ bipyridine) were hydrothermally synthesized by altering the metal/carboxylate ratios or in the presence of an additional chelate 2,2′ bpy ligand, and characterized by single crystal X ray diffraction. The results show that different metal/carboxylate ratios can influence the polymeric structures and the presence of 2,2′ bpy ligand alters the topology of the framework from two dimensional to three dimensional.展开更多
The title complex was synthesized in aqueous solution, and its crystal structure was determined by X ray diffraction. The crystal is triclinic space group P 1 with a =1 00935(9) nm, b =1 20190(2) nm, c ...The title complex was synthesized in aqueous solution, and its crystal structure was determined by X ray diffraction. The crystal is triclinic space group P 1 with a =1 00935(9) nm, b =1 20190(2) nm, c =1 28432(8) nm, α =95 013(9)°, β =102 814(5)°, γ =113 368(9)°, V =1 3676(3) nm 3, Z =1, D c=1 962 g/cm 3. The complex is a dimeric molecule with four bridging carboxyl groups from four valine molecules between two erbium ions. Each erbium ion is coordinated by four oxygen atoms from four carboxyl groups and four oxygen atoms of four water molecules with the coordination number 8, taking a square antiprism arrangement.展开更多
A new tripodal ligand, N, N, N′, N′, N″, N″ hexaisopropyl 2, 2′, 2″ nitrilotris (2,1 ethoxy) triacetamide (L) and its new erbium picrate complex were prepared. The structure of the complex was determined by...A new tripodal ligand, N, N, N′, N′, N″, N″ hexaisopropyl 2, 2′, 2″ nitrilotris (2,1 ethoxy) triacetamide (L) and its new erbium picrate complex were prepared. The structure of the complex was determined by X ray crystal structure analysis. The result reveals that the Er 3+ is encapsulated by the three arms of the tripodal ligand, and nine coordinated by the bridged head nitrogen atom, all ether oxygen atoms and carbonyl oxygen atoms of the ligand, and two oxygen atoms of the bidentate picrate. The coordination polyhedron is a distorted mono-capped square antiprism.展开更多
Ring-opening polymerization of Ε-caprolactone was successfully carried out by diisopropylamido bis (methylcyclopentadienyl) erbium as the catalyst. It is found that organoerbium amide is a very active catalyst for Ε...Ring-opening polymerization of Ε-caprolactone was successfully carried out by diisopropylamido bis (methylcyclopentadienyl) erbium as the catalyst. It is found that organoerbium amide is a very active catalyst for Ε-caprolactone ring-opening polymerization. The activity increases with the increasing of polymerization temperature. Under certain conditions, the polymerization system shows a living characteristic.展开更多
The formation of ( t BuCp) 2ErOEt was discussed. Its single crystal structure was determined by X ray diffraction. The crystal is monoclinic, P 2(1)/ c space group, a =1.0191(2), b =1.6203(5), c ...The formation of ( t BuCp) 2ErOEt was discussed. Its single crystal structure was determined by X ray diffraction. The crystal is monoclinic, P 2(1)/ c space group, a =1.0191(2), b =1.6203(5), c =1.2118(3) nm, β =102.960(10)°, V =1.9500 (nm 3), Z =2, D c=1.566 mg·m -3 , R =0.0450, R w=0.1363. The complex is monomeric and solvent free in the solid state. The erbium ion is coordinated by two tert butyl cyclopentadienyl rings and one oxygen atom of ethoxy group to form a seven coordinated complex.展开更多
文摘The absorption spectra of 4f electron transitions of the complexes of neodymium and erbium with 8-hydroxyquinoline-5-sulphonic acid in the presence of diethylamine and ethanol have been measured by normal and third-derivative spectrophotometry. Their molar absorptivities are 70.7 l.mol^(-1).cm^(-1) for Nd and 62.5 l.mol^(-1).cm^(-1) for Er. They are 7.6 times and 14.9 times greater than those of corresponding chlorides, respectively. Use of the third-derivative spectra both eliminates the interference of Ce(Ⅳ) and increases the sensitivity for Nd and Er. Beer,s Law was obeyed from 0-10 ug/ml of Nd and Er. The method has been applied to the determination of neodymium and erbium in rare earth mixtures.
文摘The active mechanisms of rare earth element erbium ( Er ) in part of aluminum alloys were investigated. Based on the investigation of the effect of the unitary rare earth elements (Er, La, Y, Ce, Nd, Gd, and Sc) and the transition element zirconium on the aluminum alloys, it is concluded that, with Er alloyed, high purity aluminum and Al Mg alloys are featured with refined grain structure, superior heat stability and even higher hardness or tensile strength with unchanged ductility; but Er is not beneficial to the mechanical property of Al Cu alloy, so is Sc. It may also be concluded, to most of the aluminum alloys, Er can be an effective alloying element, like Sc; and for the lower price of Er, the cost of modifying aluminum alloys by Er will be reduced.
文摘The sample preparation technique for a mixed rare earth (MRE)Er-Ba-Cu-O system by solid-state reaction method with the MRE-oxide containing 68.22% Er2O3 is reported in this paper. The results of superconductivity measurements, crystal structure analysis by means of X-ray powder diffraction and scanning electron microscope (SEM) analysis are also presented.
基金financially supported by the Science and Technology Ministry of China to the National High Technology "863" Project (No. 2012AA062302)
文摘In order to investigate the effect of erbium （Er） on the microstructure of orthorhombic Ti2A1Nb-based alloys, four testing alloys were prepared by adding differ- ent contents of the rare earth metal Er to Ti-22A1-25Nb alloy and optical microscopy, X-ray diffraction, scanning electron microscopy, electron probe microanalysis, energy- dispersive spectrometry, and transmission electron microscopy were used. The results show that the addition of Er is capable of grain refining and the refinement effect is more obvious with increasing content of Er. The Er203 dispersoids formed by internal oxidation and A13Er com- pound particles are observed in Er-doped alloys and the number of Er precipitates is increased with increasing Er addition. It is likely that the solubility of Er in the Ti2A1Nb alloy is very low and Er precipitates tend to segregate at grain boundaries, which together with the surface activity of rare earth elements is supposed to decrease the prior B2 grain size of Ti-22A1-25Nb alloy effectively.
基金the Zhejiang Provincial Natural Science Foundation of China (Y404279)
文摘The sorption behavior and mechanism of a novel macroporous weak acid resin(D113 resin) for Er(Ⅲ) were investigated. The optimal sorption condition of D113 resin for Er(Ⅲ) was pH 6.42 in HAc-NaAc medium. The statically saturated sorption capacity was 272 mg·g-1 at 298 K in HAc-NaAc medium. The Er(Ⅲ) adsorbed on D113 resin could be reductively eluted by the mixed solution of HCl and NaCl. The elution percentage could reach 100%. The resin could be regenerated and reused without apparent decrease of sorption capacity. The apparent sorption rate constant was k298=1.98×10-5 s-1. The apparent activation energy was 8.60 kJ·mol-1. The sorption behavior of D113 resin for Er(Ⅲ) obeyed the Freundlich isotherm and Langmuir isotherm. The sorption parameters of thermodynamics were ΔH=44.0 kJ·mol-1, ΔS=223 J·mol-1·K-1, ΔG298 K=-22.3 kJ·mol-1, respectively. The molar coordination ratio of the functional group of D113 resin to Er(Ⅲ) was 3∶1. The sorption mechanism of D113 resin for Er(Ⅲ) was examined using chemical method and IR spectrometry.
基金supported by the Analysis Project under Zhejiang Provincial Scientific and Technological Research Planning (2008F70059)Zhejiang University Graduate Business Research Innovation Fund
文摘The adsorption and desorption behaviors of Er(Ⅲ) ion on D113-Ⅲ resin were investigated.Batch adsorption studies were carried out with various Er(Ⅲ) ion concentrations,pH,contact time and temperature,indicating that D113-Ⅲ resin could adsorb Er(Ⅲ) ion effectively from aqueous solution.The loading of Er(Ⅲ) ion onto D113-Ⅲ resin increased with increasing the initial concentration.The adsorption was strongly dependent on pH of the medium with enhanced adsorption as the pH turned from 3.45 to 6.75.In the batch s...
文摘Three polymeric erbium(Ⅲ) complexes [Er(oba)(Hoba)(H 2O) 2]H 2O (A),[Er 2(oba) 3(H 2O) 4] (B), [Er 2(oba) 3(2,2′ bpy) 2] (C) (H 2oba=4,4′ oxybis(benzoic acid), 2,2′ bpy = 2,2′ bipyridine) were hydrothermally synthesized by altering the metal/carboxylate ratios or in the presence of an additional chelate 2,2′ bpy ligand, and characterized by single crystal X ray diffraction. The results show that different metal/carboxylate ratios can influence the polymeric structures and the presence of 2,2′ bpy ligand alters the topology of the framework from two dimensional to three dimensional.
文摘The title complex was synthesized in aqueous solution, and its crystal structure was determined by X ray diffraction. The crystal is triclinic space group P 1 with a =1 00935(9) nm, b =1 20190(2) nm, c =1 28432(8) nm, α =95 013(9)°, β =102 814(5)°, γ =113 368(9)°, V =1 3676(3) nm 3, Z =1, D c=1 962 g/cm 3. The complex is a dimeric molecule with four bridging carboxyl groups from four valine molecules between two erbium ions. Each erbium ion is coordinated by four oxygen atoms from four carboxyl groups and four oxygen atoms of four water molecules with the coordination number 8, taking a square antiprism arrangement.
文摘A new tripodal ligand, N, N, N′, N′, N″, N″ hexaisopropyl 2, 2′, 2″ nitrilotris (2,1 ethoxy) triacetamide (L) and its new erbium picrate complex were prepared. The structure of the complex was determined by X ray crystal structure analysis. The result reveals that the Er 3+ is encapsulated by the three arms of the tripodal ligand, and nine coordinated by the bridged head nitrogen atom, all ether oxygen atoms and carbonyl oxygen atoms of the ligand, and two oxygen atoms of the bidentate picrate. The coordination polyhedron is a distorted mono-capped square antiprism.
文摘Ring-opening polymerization of Ε-caprolactone was successfully carried out by diisopropylamido bis (methylcyclopentadienyl) erbium as the catalyst. It is found that organoerbium amide is a very active catalyst for Ε-caprolactone ring-opening polymerization. The activity increases with the increasing of polymerization temperature. Under certain conditions, the polymerization system shows a living characteristic.
文摘The formation of ( t BuCp) 2ErOEt was discussed. Its single crystal structure was determined by X ray diffraction. The crystal is monoclinic, P 2(1)/ c space group, a =1.0191(2), b =1.6203(5), c =1.2118(3) nm, β =102.960(10)°, V =1.9500 (nm 3), Z =2, D c=1.566 mg·m -3 , R =0.0450, R w=0.1363. The complex is monomeric and solvent free in the solid state. The erbium ion is coordinated by two tert butyl cyclopentadienyl rings and one oxygen atom of ethoxy group to form a seven coordinated complex.
