Study on Oxygen Isotope Fractionation in RE Oxide Minerals

ＳｔｕｄｙｏｎＯｘｙｇｅｎＩｓｏｔｏｐｅＦｒａｃｔｉｏｎａｔｉｏｎｉｎＲＥＯｘｉｄｅＭｉｎｅｒａｌｓＦａｎｇＴａｏ（方涛），ＱｉｕＹｕｚｈｕｏ（裘愉卓）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｃｈｅｍｉｓｔｒｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｇｕｉｙａｎｇ５...     

氟碳铈矿稀土抛光粉与氟碳酸盐稀土抛光粉性能研究

采用差热热重分析、Ｘ射线粉末法、电子显微术、物理及化学分析等手段，对比分析了氟碳铈矿稀土抛光粉和氟碳酸盐稀土抛光粉的外观形貌、晶体结构、化学成份及物理性能，并探讨了两种试制样品性能差异的机理。     

Investigation of Interaction of Lanthanides with Hemoglobin and Effect on Oxygen-Carier Function

ＩｎｖｅｓｔｉｇａｔｉｏｎｏｆＩｎｔｅｒａｃｔｉｏｎｏｆＬａｎｔｈａｎｉｄｅｓｗｉｔｈＨｅｍｏｇｌｏｂｉｎａｎｄＥｆｅｃｔｏｎＯｘｙｇｅｎＣａｒｉｅｒＦｕｎｃｔｉｏｎＺｕｏＺｈｉｙｉｎｇ（左智颖），ＦｅｎｇＪｕｎｔｉｎｇ（冯俊婷），ＢｏＹｕｎｈｏ...     

HRTEM Study of Three New Regularly Mixed-layer Structures of B_8S_6 Type in Ca-RE Fluorocarbonate Minerals

ＨＲＴＥＭＳｔｕｄｙｏｆＴｈｒｅＮｅｗＲｅｇｕｌａｒｌｙＭｉｘｅｄｌａｙｅｒＳｔｒｕｃｔｕｒｅｓｏｆＢ８Ｓ６ＴｙｐｅｉｎＣａＲＥＦｌｕｏｒｏｃａｒｂｏｎａｔｅＭｉｎｅｒａｌｓＭｅｎｇＤａｗｅｉ（孟大维），ＷｕＸｉｕｌｉｎｇ（吴秀玲），ＰａｎＺｈ...     

对我国二十种土壤中稀土元素形态分组的研究

本文提出了土壤中稀土元素形态分组的方法,对我国20种土壤中稀土元素形态分组特征进行了评价。结果表明,土壤中稀土元素主要以残渣态存在,其次为氧化铁结合态和松结有机态。在碱性土壤中碳酸盐结合态仅次于氧化铁结合态,中酸性土壤中紧结有机态仅次于松结有机态,而碱性土壤中紧结有机态极低。土壤中交换态和氧化锰结合态稀土元素均比较低。     

Syntactic Intergrowth Structure in the Calcium-Rare Earth Fluorocarbonate Minerals

Ｔｈｅｃａｌｃｉｕｍｒａｒｅｅａｒｔｈｆｌｕｏｒｏｃａｒｂｏｎａｔｅｍｉｎｅｒａｌｓｅｒｉｅｓｉｓａｎｉｍｐｏｒｔａｎｔｍｉｎｅｒａｌｆａｍｉｌｙｉｎｒａｒｅｅａｒｔｈｆｌｕｏｒｏｃａｒｂｏｎａｔｅｓ，ｉｎｃｌｕｄｉｎｇｂａｓｔｎａｅｓｉｔｅ（Ｂ），...     

Oxygen vacancy enhanced biomimetic superoxide dismutase activity of CeO_2-Gd nanozymes

Cerium oxide-based nanozymes have recently drawn much attention in the field of biomedical and antioxidant applications,because of their unique regenerative or autocatalytic properties.Herein,we studied the biomimetic superoxide dismutase(SOD) nanozymes CeO_2-Gd that combines the fluorescence properties of rare earth Gd with the antioxidant properties of CeO_2 nanoparticles,which was prepared via facile route.The structure and composition of the CeO_2-Gd were measured and verified by X-ray powder diffraction(XRD),Raman spectroscopy,transmission electron microscopy(TEM),energydispersive X-ray spectroscopy(EDX),and X-ray electron spectroscopy(XPS).Confocal microscopy was used to image cells.Antioxidant performance and cell viability of these nanozymes were measured in vitro using BGC-803 cell.CeO_2-Gd nanozymes with a higher Ce~(3+)/Ce~(4+) ratio show higher superoxide dismutase(SOD) mimetic activity.Their antioxidant activity and fluorescence properties of CeO_2-Gd in BGC-803 cancer cells are enhanced by oxygen vacancies generated by doping rare-earth elements Gd.This work may guide the future design of CeO~2-Gd-based biomimetic nanozymes for anticancer and antioxidant applications.     

Effect of RE Oxide on Cracking Resistance of Hardfacing Metal

Ｓｉｎｃｅｎｏｔｏｎｌｙｔｈｅｈｏｔｒｏｌａｎｄｈｏｔｄｉｅｗｉｔｈｈｉｇｈｅｒｐｒｉｃｅａｒｅｃｏｎｓｕｍｅｄｉｎｌａｒｇｅｑｕａｎｔｉｔｉｅｓｂｕｔａｌｓｏｔｈｅｉｒｑｕａｌｉｔｙａｆｅｃｔｓｔｈｅｐｒｏｄｕｃｔｉｖｉｔｙ，ｔｈｅｙａｒｅｃｒｉｔ...     

Types, Characteristics and Formation Mechanisms of Ion-adsorpted RE Deposits

Ｔｙｐｅｓ，ＣｈａｒａｃｔｅｒｉｓｔｉｃｓａｎｄＦｏｒｍａｔｉｏｎＭｅｃｈａｎｉｓｍｓｏｆＩｏｎ－ａｄｓｏｒｐｔｅｄＲＥＤｅｐｏｓｉｔｓ￥ＬｉｎＣｈｕａｎｘｉａｎ（林传仙），ＷａｎｇＹｉｘｉａｎ（王一先），ＱｉａｎＺｈｉｘｉｎ（钱志鑫），ＺｈｅｎｇＺ...     

Enhancement of La_2O_3 to Li-Mn/WO_3/TiO_2 for oxidative coupling of methane

A series of La_2O_3-promoted Li-Mn/WO_3/TiO_2 catalysts were prepared by varying the concentration of La_2O_3 promoter.The effect of La_2O_3 promoter on its properties and catalytic performance for OCM was characterized with XRD,FT-IR,O_2-TPD,Raman,CO_2-TPD,H_2-TPR,XPS and CH_4-TPSR,The results show that all the La_2O_3-promoted Li-Mn/WO_3/TiO_2 catalysts possess a larger amount of strong basic sites and more abundant chemisorbed oxygen species in comparison with Li-Mn/WO_3/TiO_2,which is beneficial to OCM reaction.Furthermore,La_2O_3 promoter can enhance the mobility of the oxygen species and the Mn species redox ability,which can also be favorable for the improvement of the catalytic performance for OCM,Due to the optimal synergistic interaction of these factors,5 wt%La_2O_3-Li-Mn/WO_3/TiO_2 exhibits the best performance among all the catalysts,on which the highest C_2 yield of 19.2% is achieved at 750℃.     

Study on Structural Stability of RE/Fe Multilayers

ＳｔｕｄｙｏｎＳｔｒｕｃｔｕｒａｌＳｔａｂｉｌｉｔｙｏｆＲＥ／ＦｅＭｕｌｔｉｌａｙｅｒｓＬｉＳｈｅｎｇｌｉ（李胜利），ＷａｎｇＣｈａｎｇｚｈｅｎｇ（王长征），ＢａｏＷｅｎｌｉａｎｇ（鲍文良）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅ...     

Organic Metallogeny of Weathering Crust RE Deposit

ＯｒｇａｎｉｃＭｅｔａｌｏｇｅｎｙｏｆＷｅａｔｈｅｒｉｎｇＣｒｕｓｔＲＥＤｅｐｏｓｉｔＣｈｅｎＺｈｉｃｈｅｎｇ（陈志澄）（ＧｕａｎｇｄｏｎｇＣｏｌｅｇｅｏｆＰｈａｒｍａｃｙ，Ｇｕａｎｇｚｈｏｕ５１０２２４，Ｃｈｉｎａ）ＹｕＳｈｏｕｊｕｎ（俞受均金）...     

Highly dispersed CeO2–x nanoparticles with rich oxygen vacancies enhance photocatalytic performance of g-C3N4 toward methyl orange degradation under visible light irradiation

CeO₂/g-C₃N₄ photocatalysts have attracted tremendous attention in the photocatalytic degradation of organic pollutants. The design and construction of highly active CeO₂/g-C₃N₄ photocatalysts without harsh conditions are still challenging. Herein, highly dispersed CeO_2–x nanoparticles with rich oxygen vacancies were successfully precipitated on the surface of g-C₃N₄ under mild conditions. The fabricated CeO_2–x/g-C₃N₄ exhibits remarkable activity and stability for photocatalytic degradation of MO pollutant. The optimal rate constant of MO degradation over CeO_2–x/g-C₃N₄ is about 0.031 min^?1, which is three times higher than that of g-C₃N₄. A negligible activity decrease is observed after three cycling runs. The enhanced catalytic performance can be ascribed to the excellent dispersion of CeO_2–x with rich oxygen vacancies that benefit O₂ adsorption and visible light absorption. In addition, the proper band alignment between CeO_2–x and g-C₃N₄ is conducive to the highly efficient separation of photogenerated electron–hole pairs.     

关于我国稀土三基色荧光粉与灯的问题

阐述了国内稀土三基色粉和灯当前的情景,并提出了要改进的意见。     

RE 对 ZnAl4 合金组织和力学性能的影响

在ZnAl4合金中添加RE元素对其进行变质处理,通过金相组织和力学性能分析,研究了RE对该合金的显微组织和力学性能的影响。结果表明,基体中加入适量的稀土后,优化了组织结构,细化了晶粒,使合金的强度、硬度提10%以上,延伸率也有一定的提高。     

Study on RE-Modiffied Mordenite Catalysts for Amination Reaction

Ｉｎｏｒｄｅｒｔｏｉｍｐｒｏｖｅｔｈｅａｃｔｉｖｉｔｙａｎｄｓｅｌｅｃｔｉｖｉｔｙｔｏｄｉｍｅｔｈｙｌａｍｉｎｅ（ＤＭＡ）ｉｎａｍｉｎａｔｉｏｎｒｅａｃｔｉｏｎ，ｍａｎｙｒｅｓｅａｒｃｈｅｒｓｈａｖｅｄｏｎｅｍａｎｙｗｏｒｋｓｍａｉｎｌｙｏｎｔｈｅ...     

Fractionation of Rare Earth Elements in Plants Ⅰ. Fractionation Patterns and Their Forming Mechanisms in Different Organs of Triticum Aestivum

Fractionations of rare earth elements (REEs) and the forming mechanisms in plants were studied using Triticum aestivum as plant material with application of exogenous REEs and hydroponic culture. REEs were significantly fractionated in different parts of Triticum aestivum. M-type tetrad effect could be observed in both root and shoot of Triticum aestivum, which might result from the different abilities of REEs to form phosphate precipitation. Middle REEs (MREEs), light REEs (LREEs) and heavy REEs (HREEs) were enriched in root, stem and leaf of Triticum aestivum, respectively. REE speciation calculations using VMINTEQ program show REEs in simulated xylem solution mainly exist as REE-EDTA- and RE3 , but only HREEs are enriched in REE-EDTA-, while LREEs are enriched in the other REE species. It is suggested that the fractionation between LREEs and HREEs might be caused by the uptake of REE-EDTA- in Triticum aestivum leaves, but might result from the uptake of the other REE species in their stems.     

Thermochemical Properties of Ternary Complexes of RE Perchlorate withGlycine and Imidazole

Ｒａｒｅｅａｒｔｈｉｏｎｓｐｏｓｅｓｓｏｍｅｓｐｅｃｉａｌｆｕｎｃｔｉｏｎｓｉｎｂｉｏｌｏｇｉｃａｌｂｏｄｙ．Ａｍｉｎｏａｃｉｄｓａｒｅｔｈｅｓｔｒｕｃｔｕｒｅｕｎｉｔｏｆｐｒｏｔｅｉｎｓ．Ｉｍｉｄａｚｏｌｅｉｓｈｅｔｅｒｏｃｌｙｃｌｉｃｃｏｍｐ...     

Magnetic Properties of Fe/RE Multilayers and Change Mechanism

Ｍｕｔｉｌａｙｅｒｅｄｆｉｌｍｓｏｆｓｔａｃｋｉｎｇａｌｔｅｒｎａｔｅｌｙｆｅｒｒｏｍａｇｎｅｔｉｃａｎｄｎｏｎｍａｇｎｅｔｉｃｍａｔｅｒｉａｌｓｈａｖｅｂｅｅｎｗｉｄｅｌｙｓｔｕｄｉｅｄ．Ｆｉｌｍｓｅｘｈｉｂｉｔｆｅｒｒｏｍａｇｎｅｔｉｓｍｗｈｅｎｔｈｅｔｈｉｃｋｎｅｓｓｏｆｆｅｒｒｏｍａｇｎｅｔｉｃｌａｙｅｒｓｅｘｃｅｅｄｓｔｈｅｃｒｉｔｉｃａｌｖａｌｕｅ（～２－０ｎｍ）,ａｎｄｔｒａｎｓｆｏｒｍｉｎｔｏｐａｒａｍａｇｎｅｔｉｃｗｈｅｎｔｈｅｔｈｉｃｋｎｅｓｓｉｓｌｅｓｓｔｈａｎｔｈｅｃｒ…     

Absorption behavior of lattice oxygen in Ce_(0.8)Y_(0.2)O_(2-δ) at intermediate temperature

The absorption behavior of lattice oxygen for Ce_(0.8)Y_(0.2)O_(2-δ)(YDC) crystal was investigated. Combined with TG-DSC, XRD, Raman and XPS characterization, lattice oxygen absorption occurs at intermediate temperature(from 500 to 800 ℃),which is related to the oxygen vacancies consumption,and no phase change is observed in this process. In electric conductivity relaxation(ECR) experiment, prolonged oxygen diffusion process is observed above 600 ℃, which may be caused by oxygen absorption process. And through ECR experiments,the bulk diffusion coefficient D_(chem) and surface exchange coefficient K_(ex) for YDC dense sample are measured as 6,5×10~(-5)-2×10~(-4)cm~2/s and K_(ex)=2×10~(-4)-9×10~(-4)cm/s at intermediate temperature range.