Rare Earth-Boronizing and Its Applications

１ＥｘｐｅｒｉｍｅｎｔａｌＴｈｅｔｅｃｈｎｏｌｏｇｙｏｆｂｏｒｏｎｉｚｉｎｇｏｎｓｐｅｃｉｍｅｎｓｏｆ４５ｓｔｅｅｌｉｓｓｈｏｗｎｉｎＴａｂｌｅ１．Ｒａｒｅｅａｒｔｈａｌｏｙｗａｓａｄｄｅｄｉｎｔｈｅｐａｃｋｂｏｒｏｎｉｚｉｎｇａｇｅｎｔ．Ｔｈｅｂｒ...     

Rare Earths and Magnetic Refrigeration

Modern coolingis almost entirely based on a com-pression/expansion refrigeration cycle .It is a high-en-ergy demand industry with annual energy consumptionmeasured in billions kWh.Over the years ,all parts ofa conventional refrigerator ,i .e ., compressors , heatexchangers , refrigerants , and packaging have beenconsiderably i mproved by an extensive research anddevelopment effort ,and partly by government edicts .This was made possible by a continuous dollar influxfromboth federal and industr…     

Review of Rare Earths and Fluid-Rock Interaction

As demonstrated by a great amount of geologic and experimental evidences, RE of rock systems may be mobilized during fluid-rock interaction when solutions are rich in F^-, Cl^-, CO3^2- , HCO3^-, CO2, HPO4^2- , HS^-,S^2- , SO4^2- , though little has been known about the mobilizing mechanism of these anions or ligands. The fractionation of RE resulted from hydrothermal alterations, i. e., fluid-rock interactions, are distinctive. One set of field data implies the preferential mobility of the LRE, while another set of field observations demonstrates the dominant mobilization of the HRE, and some theoretical prediction is not consistent with the field evidence. The Eu anomalies caused by fluid-rock interaction are complex and compelling explanation is not available due to inadequate experimental approaches. To know the exact behavior of RE during fluid-rock interaction and to solve the contradiction between some theoretical predictions and field observations, the following works remain to be done : ( 1 ) experimental investigations of RE mobility and fractionation as a function of fluid chemistry, e.g., the activity of F^-,Cl^-, CO3^2- , HCO3^-, CO2, HPO4^2- , HS^-, S^2- , SO4^2- , etc. ; (2) experimental determination of RE mobility and fractionation as a function of T, P, pH, Eh and water/rock ratios; (3) investigation of the mechanism and the controlling factors of RE partitioning between hydrothermal minerals and fluids. It was demonstrated that RE mobility is a potentially useful method for exploration.     

Syntheses and Photosensitive Effects of Rare Earth Carboxylate Complexes

ＳｙｎｔｈｅｓｅｓａｎｄＰｈｏｔｏｓｅｎｓｉｔｉｖｅＥｆｆｅｃｔｓｏｆＲａｒｅＥａｒｔｈＣａｒｂｏｘｙｌａｔｅＣｏｍｐｌｅｘｅｓＬｉｎＹｉｃｈａｏ（林宜超）（ＦｕｊｉａｎＩｎｓｔｉｔｕｔｅｏｆＴｅｓｔｉｎｇＴｅｃｈｎｏｌｏｇｙ，Ｆｕｚｈｏｕ３５０００...     

Distribution and Behaviour of Rare Earths in Laser Coating

ＴｈｅｒｅａｒｅｍａｎｙｍｅｔｈｏｄｓｏｆａｄｄｉｎｇＲＥｉｎｔｏｓｔｅｅｌｓｕｒｆａｃｅ［１］，ｏｆｗｈｉｃｈｔｈｅｄｉｆｕｓｉｏｎｐｅｎｅｔｒａｔｉｏｎｍｅｔｈｏｄｉｓａｎｅｗｏｎｅ．Ｔｈｅｌａｓｅｒｔｒｅａｔｅｄｓｕｒｆａｃｅｓｏｆｂｏｔｈｔ...     

Molecular Design and Electronic Structure of Polynuclear Rare Earth Complexes and Clusters

Studies on the electronic structure,molecular design,syntheses of some novel series of tetranuclear rareearth complexes in our laboratory have been reviewed.Spin-unrestricted localized INDO method was used tocalculate the electronic structure and the chemical bonding in the typical rare earth cluster Sc[Sc_6Cl_(12)Co]wasdiscussed.     

Synthesis and Characterization of Rare Earth Complexes of Ferrocenylcarbonylhydrazine

Ｔｈｅｍｅｔａｌｃｏｍｐｌｅｘｅｓｏｆｈｙｄｒａｚｉｄｅｓｈａｖｅａｔｔｒａｃｔｅｄｃｏｎｓｉｄｅｒａｂｌｅｉｎｔｅｒｅｓｔｏｗｉｎｇｔｏｔｈｅｉｒａｎｔｉｆｕｎｇａｌａｎｄａｎｔｉｂａｃｔｅｒｉａｌａｃｔｉｖｉｔｉｅｓ[1 ,2 ] .Ｔｈｅｙｃａｎａｌｓｏｂｅｕｓｅｄａｓａｎａｌｙｔｉｃａｌｒｅａｇｅｎｔｓ[3 ]ａｎｄｅｘｔｒａｃｔｉｎｇａｇｅｎｔｓｆｏｒｍｅｔａｌｓａｌｔｓ[4 ] .Ｍａｎｙｃｏｍｐｌｅｘｅｓｏｆｈｙｄｒａｚｉｄｅｓｈａｖｅｂｅｅｎｓｙｎｔｈｅｓｉｚｅｄａｎｄｃｈａｒａｃｔｅｒｉｚｅｄ[5]…     

Preparation and Characteristics of Rare Earth Loaded Titanium Dioxide

Composite oxide catalysts Eu/TiO2, Ce/TiO2, Y/TiO2 (RE/TiO2) were prepared by impregnation method and characterized by means of UV-Vis spectroscopy, TEM and BET. The results indicate that the size of TiO2 has different elfeet on the modification efficiency. The catalytic activity of micron scale TiO2 increases by 136% and 59% owing to the addition of Y and Ce, respectively, while the catalytic activity of nanoscale TiO2 decreases due to the doping of Y and Ce.     

Interactions and Biological Activity of Rare Earth Perchlorate Complexes with Alanine and Imidazole

Interactions and Biological Activity of Rare Earth Perchlorate Complexes with Alanine and Imidazole     

Synthesis and Properties of Rare Earth Complexes with p-Methoxybenzoyl-Benzoylmethane and / or Amines

p-Methoxybenzoyl-benzoylmethane(HA)and its complexes LnA_4QH and LnA_3·xH_2O(for Ln=La～Yb,Q=n-tributyl amine,diethyl amine,hexahydropyridine)were synthesized and characterized by elementalanalysis,molar conductivity measurement,infrared spectroscopy,UV-visible absorption spectroscopy,thermalanalysis and ~1H NMR spectra.Possibilities of using praseodymium and europium complexes as shift reagent arealso discussed.     

China Limits the Mining Quantity of Tungsten and Rare Earth

Based on a notice issued by the Ministry of Land Resources, China's tungsten mining quantity in 2006 will be controlled to 59,060 tons in concentrates form, which include 4,250 tons of recycled tungsten. And the rare earth mining quantity in 2006 will also be controlled to 86,620 tons (REO) including 8,320 tons of heavy rare earth and 78,200 tons of light rare earth.     

Chemical Bond and Spectral Effect of Rare Earth Compound Crystals

The chemical bond parameters and ionic polarizabilities in complex crystals are calculated.Themechanism of host influence on the nephelauxetic effect and hypersensitive transition is discussed.     

Coprecipilation Reaction Synthesis and Photoluminescence of Rare Earth Phosphate-Vanadate Phosphors

By coprecipitation reaction ,rare earth doped yttrium phosphate-vanadate phosphors were prepared.These phosphors were characterized by XRD,SEM,and photoluminescence under 147 or 254nm excitation.The SEM image shows that the size of the phosphor particles is uniform and less than 1μm.     

Research and Development of Rare Earth Advanced Materials in China

ＲｅｓｅａｒｃｈａｎｄＤｅｖｅｌｏｐｍｅｎｔｏｆＲａｒｅＥａｒｔｈＡｄｖａｎｃｅｄＭａｔｅｒｉａｌｓｉｎＣｈｉｎａＷａｎｇＤｉａｎｚｕｏ（王淀佐），ＷａｎＱｕｎ（万群），ＹａｎｇＹｕｃｈｕｎ（杨遇春）（ＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ...     

Accumulation and Fractionation of Rare Earth Elements in Soil-Rice Systems

Rare earth elements(REEs)have been widelyapplied in agriculture as micro-fertilizer in China,andit has become an urgent taskto understand their cont-ents,distribution,translocation and accumulation inthe soil-crop systems and their ecological effects,inor…     

Synthesis and Properties of Heteropoly Tungstovanadogermanic Complexes with Rare Earths

Ｈｅｔｅｒｏｐｏｌｙｃｏｍｐｏｕｎｄｉｓａｎｅｗｃａｔａｌｙｓｔｗｉｔｈｍａｎｙｆｕｎｃｔｉｏｎｓｉｎｃｈｅｍｉｓｔｒｙｉｎｄｕｓｔｒｙ .Ｉｔｓｅｘｃｅｌｌｅｎｔｃａｔａｌｙｔｉｃｐｅｒｆｏｒｍａｎｃｅｉｓｄｅｔｅｒｍｉｎｅｄｂｙｉｔｓｃｏｍｐｏｓｉｔｉｏｎａｎｄｓｔｒｕｃｔｕｒｅ .Ｉｔｈａｓｓｉｍｐｌｅｃｏｍｐｏｓｉｔｉｏｎａｎｄｆｉｘｅｄｓｔｒｕｃｔｕｒｅ ,ａｌｔｈｏｕｇｈｉｔｍａｙｃｏｎｓｉｓｔｏｆｍａｎｙｅｌｅｍｅｎｔｓ .Ｉｔｓｓｔｒｕｃｔｕｒｅａｎｄｐｒｏｐｅｒｔｙｃａｎｂｅｃｈａｎｇ…     

Blue-Light Emission from Undoped and Rare Earth-Doped Wide Bandgap Oxides

Blue-light emitting materials have been receivingconsiderable attention due to their applications for avariety of optoelectronic devices and display technolo-gies . Rare earth-doped compounds have long founduses as blue phosphors in a variety of devices due totheir intensely luminescent f-d and f-f electronictransitions[1]. Metal sulfides ,such as ZnS have beenutilized as conventional phosphors due to their excel-lent brightness . However ,the life span of the displaydevices is li mited due t…     

Advances in Rare Earth Application to Semiconductor Materials and Devices

The development of rare earths (RE) applications to semiconductor materials and devices is reviewed. The recent advances in RE doped silicon light emitting diodes (LED) and display materials are described. The various technologies of incorporating RE into semiconductor materials and devices are presented. The RE high dielectric materials, RE silicides and the phase transition of RE materials are also discussed. Finally, the paper describes the prospects of the RE application to semiconductor industry .