Study on Electronic Structure of Rare Earth Complex with Dioxygen

The electronic structure and chemical bonding of[Ce(CO_3)_3O_2]_2~(8-) have been studied by INDO(Intermediate Neglect of Differentiated Overlap)method in this paper.The results obtained show that theHOMO of[Ce(CO_3)_3O_2]_2~(8-) is mainly composed of the anti-bonding π orbitals of the pcroxide ion(O_2~(2-))and the LUMO is mainly composed of the 4f orbitals of the Ce(Ⅳ).The peroxide ion coordinates to ceric ionby means of σ and π dative bonds.After coordination the O-O bond of the peroxide ions is strengthened.Bycomparison with cerous complexes,the contribution of the 4f orbitals to bonding increases in the ceric com-plex.     

Study on Copolymerization of Rare Earth－Carboxylic Acid Complex

Complex of rare earth with carboxylic acid was prepared by precipitation and direct method. It was copolymerized with such monomers as acrylic acid and other ones to synthesize ionomer of rare earth and organic polymer with different rare earth contents. Its glass-transition temperature and heat stability were analyzed by TG and DTA. Infra-red detector was used to show its structure. The effect of rare earth complex prepared by different methods on copolymerization and properties of copolymers was also discussed.     

Study on the Formation of Crystalline Rare Earth Carbonates from Rare Earth Ore Leaching Liquors

The crystalline precipitate of rare earth carbonates has been produced by the ammonium bicar-bonate precipitation method in the recovery of RE from the ammonium sulfate leaching liquor of the weath-ered leach-deposited rare earth ore.Various influencing factors such as time,temperature and reagent con-centration have been studied.And chemical analysis,XRD,SEM,IR spectrography,TGA and DTA havebeen used to analyze and examine the crystalline RE carbonates.Good results were obtained.     

Study on Rare Earth Ferrocene Monocarboxylate Complexes

ＳｔｕｄｙｏｎＲａｒｅＥａｒｔｈＦｅｒｒｏｃｅｎｅＭｏｎｏｃａｒｂｏｘｙｌａｔｅＣｏｍｐｌｅｘｅｓＬｉＭｅｉ（李梅）（ＢａｏｔｏｕＲａｒｅＥａｔｈＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｂａｏｔｏｕ０１４０１０，Ｃｈｉｎａ）ＳｕｎＹｕａｎｈｏｎｇ（孙元洪...     

Study on Laser Drilling in Rare Earth Magnets

ＳｔｕｄｙｏｎＬａｓｅｒＤｒｉｌｉｎｇｉｎＲａｒｅＥａｒｔｈＭａｇｎｅｔｓＬｉｕＬｉｍｉｎ（刘丽敏），ＬｉＣｈａｎｇｊｉａｎｇ（李长江）（ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＣｈｅｍｉｃａｌＴｅｃｈｎｏｌｏｇｙ，Ｂｅｉｊｉｎｇ１０００２９，Ｃｈｉｎ...     

Study on Mechanism of Rare Earth PVC Stabilizer

Rare earth compounds can be used as PVC thermal stabilizers. According to the infrared spectra of the mixture of PVC and some stearates, the mechanism of stabilization of different stearates was studied. The specialty of rare earth stabilizers was found. They can change the conformation of PVC and restrain the elimination of HCI. From this aspect, the unique synergetic effect with other stabilizers of rare earth compounds can be explained.     

Study on Adsorption of Rare Earth Elements by Kaolinite

Rareearthelements (REEs)werewidelyappliedtotracingthesourcesofmaterialsandtostudyingtheirevolutionprocessesinmanyfieldsofearthscienceinconsiderationoftheirsimilarityandsystematicdiffer enceinchemicalproperties .Furthermore ,lanthanidesarebothimportantprod…     

Study on Y-Base Rare Earth Alloy in Ultra-High Hardfacing

The effect of Y-base rare earth alloy in ultra-high hardfacing was observed by means of OM, SEM and XRD. Precipitated carbide can be metamorphosed and spheroidized in surfacing by adding Y-base rare earth alloy, which contributes to the increase of precipitated carbide. Rare earth combined with oxygen and sulfur can improve the morphology of slag inclusion as well as purify surfacing. The result shows proper rare earth alloy in surfacing can fine its microstmcture, improve hardness and impact toughness.     

Study on the Interaction between Rare Earth and Carbon in High Carbon Steel

ＳｔｕｄｙｏｎｔｈｅＩｎｔｅｒａｃｔｉｏｎｂｅｔｗｅｅｎＲａｒｅＥａｒｔｈａｎｄＣａｒｂｏｎｉｎＨｉｇｈＣａｒｂｏｎＳｔｅｅｌ￥ＬｉｎＱｉｎ（林勤），ＦｕＴｉｎｇｌｉｎｇ（付廷灵），ＹｕＺｏｎｇｓｅｎ（余宗森），ＹｅＷｅｎ（叶文）（Ｕｎｉｖｅｒｓｉｔ...     

Study of Electroplex Emission from Organic Electroluminescent Devices with Rare Earth Complex

A novel organic electroluminescent device was made with the structure of ITO/PVK：Tb0.5Eu0.5（TTA）3 Dipy/ BCP/Alq3/Al（a） which utilized the rare earth complex Tb0.5Eu0.5（TTA）3 Dipy as the emitting layer. When it was driven under a direct electric field, 612 nm emission from EU^3＋ and 410 nm emission from PVK were observed. In addition, in the EL spectrum a new peak at 490 nm appeared. From the analysis of different devices, the mechanism of the new emission was studied. It was concluded that the new emission was the electroplex originating from the interface between the ligand （TTA）3Dipy and BCP.     

稀土元素在洁净重轨钢中存在状态的热力学模型研究

建立了可以定量描述洁净稀土重轨钢凝固过程中成分偏析与夹杂物析出的耦合热力学模型,经文献验证,模型具有较高精度。通过模型分析了稀土加入量对洁净钢中夹杂物的析出规律与稀土存在状态的影响。得出在洁净重轨钢中加入稀土可以变质钢中MnS、Al₂O₃夹杂;钢中首先析出稀土氧硫化物(或稀土铝酸盐),其次是稀土硫化物,最后是稀土氮化物;在同一稀土加入量条件下,固溶La的量要大于固溶Ce的量。     

The Thermodynamic Property of Rare Earth Complexes with L-Threonine

In this paper the stability constants and thermodynamic parameters for complexes of rare earth elementswith L-threonine have been measured systematically by potentiometry and calorimetry at 25℃ and ionicstrength of 0.15 mol/L(NaCl).The thermodynamic values for protonation of the anion of L-threonine havebeen obtained.The dependence of stability,enthalpy and entropy change of the complex upon atomic number ofcation is investigated,and the coordination of L-threonine to rare earth is also discussed in detail.     

Study on Rare Earth Interconnector of La 1-x Ca x CrO 3

Ｌａｎｔｈａｎｕｍｃｈｒｏｍｉｔｅ（ＬａＣｒＯ３）ｉｓｐａｒｔｉｃｕｌａｒｌｙｓｕｉｔａｂｌｅｆｏｒｕｓｉｎｇａｓａｎｉｎｔｅｒｃｏｎｎｅｃｔｅｒｏｆｓｏｌｉｄｏｘｉｄｅｅｌｅｃｔｒｏｌｙｔｅｆｕｅｌｃｅｌｌ（ＳＯＦＣ）ｂｅｃａｕｓｅｏｆｉｔｓｐｒｏｐｅｒｔｉｅｓｏｆｔｈｅｈｉｇｈｅｌｅｃｔｒｏｎｉｃｃｏｎｄｕｃｔｉｖｉｔｙｉｎｔｈｅｆｕｅｌａｎｄｏｘｉｄａｎｔａｔｍｏｓｐｈｅｒｅｓ,ｔｈｅｓｔａｂｉｌｉｔｙｏｆｏｐｅｒａｔｉｎｇｉｎｔｈｅｆｕｅｌｃｅｌｌｅｎｖｉｒｏｎｍｅｎｔ,ａｎｄｔｈｅ…     

稀土气态配合物LnAl_3Cl_(12)稳定性的线性分析

对稀土气态配合物ＬｎＡｌ３Ｃｌ１２的稳定性进行线性分析，发现其稳定常数的对数值，与镧系离子势（Ｚ＋／ｒ）之间存在线性关系，将镧系稀土分为两组，Ｌａ－Ｇｄ和Ｔｂ－Ｌｕ；与镧系离子基态角量子数存在斜Ｗ效应，将镧系稀土分为四组，Ｌａ－Ｎｄ，Ｐｍ－Ｇｄ，Ｔｂ－Ｈｏ，Ｅｒ－Ｌｕ。在每一组内，ＬｎＡｌ３Ｃｌ１２的稳定常数呈线性变化     

Report on Rare Earth Market Evolution and Involvement of Rhone－Poulenc in the Market

ＲｅｐｏｒｔｏｎＲａｒｅＥａｒｔｈＭａｒｋｅｔＥｖｏｌｕｔｉｏｎａｎｄＩｎｖｏｌｖｅｍｅｎｔｏｆＲｈｏｎｅ－ＰｏｕｌｅｎｃｉｎｔｈｅＭａｒｋｅｔＭａｔｔｈｅｗｓＪＤ；ＶａｎｄｅｒｓｔｒｉｃｈｔＪＰ（Ｒｈｏｎｅ－ＰｏｕｌｅｎｃＲａｒｅＥａｒｔｈｓａｎｄ...     

Effect of Rare Earth Metals on Microstructure of Directional Solidified Al－3Li Alloy

ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＭｅｔａｌｓｏｎＭｉｃｒｏｓｔｒｕｃｔｕｒｅｏｆＤｉｒｅｃｔｉｏｎａｌＳｏｌｉｄｉｆｉｅｄＡｌ－３ＬｉＡｌｌｏｙ￥ＷａｎｇＬｉ－Ｍｉｎ；ＤａｎｇＰｉｎｇ；ＤｕＦｕ－Ｙｉｎｇ；ＺｈａｏＭｉｎ－Ｓｈｏｕ（Ｃｈａｎｇｃｈｕ...