Syntheses, characteristics, and fluorescence properties of complexes of europium with benzoic acid and its derivatives

The binary complexes of europium with benzoic acid and its derivatives (phthalic acid, m-phthalic acid,o-aminobenzoic acid, salicylic acid, and sulfosalicylic acid) were synthesized and their compositions were identified by elemental analyses. UV and IR of the complexes have been investigated. The UV spectra indicated that the complexes‘ ultraviolet absorption were mainly the ligands‘ absorption. The IR spectra showed that the IR spectra of complexes are different from those of free ligands. The fluorescence properties of them were investigated by using luminescence spectroscopy, the results showed that only three complexes appear as better luminescence, they were Eu-benzoic acid,Eu-m-phthalic acid and Eu-phthalic acid, while the others exhibited the ligands‘ wideband emission.     

Characteristics of Tungsten,Titanium,Rare-Earths and Antimony Mineral Resources of China

Large area of old basements ofmetamorphic volcanic series,andmagmatic and sedimentary rocks of differ-ent ages are existing in China.They are lo-cated at the junction of plates.Especially,China is rich in Mesozoic granite rockswhich are closely related to nonferrousmetals ore deposits,and favourable for theformation of tungsten,titanium,rare—earths and antimony ore deposits.Tungsten and antimony ores of Chinaare world famous.Titanium andrare—earths ores have now caught up andsuroassed the two firsts.Geological pros-     

Cleavage nature,electrokinetics,aggregation and dispersion of kaolinite

1　INTRODUCTIONKaoliniteiscurrentlyusedinceramics ,papermanufacturing ,medicalapplications ,agriculturalchemicals ,chemicalengineering ,refractorymaterialanddefenseindustrybecausekaolinitehasmanyhighprocessingpropertiesasanindustrialmineralduetoitssurfaceproperties[1,2 ] .Inreverseflotationofdi asporicbauxite ,whichisveryimportantforthein dustryofaluminumoxideproduction ,kaoliniteisneededtoberemoved .Therefore ,Itisusefultoun derstandthecrystalstructure ,cleavagenature ,sur faceelectrokin…     

Electronic structures and physical properties of pure Cr,Mo and W

1　INTRODUCTIONIntheframeworkofthemetallicmaterialssys tematicscience[1] ,therearethreescientifictheorysystems :puremetalsystematicscience ,alloysphysicsandchemistry ,andalloysstatisticalthermodynamics .Thecoreofthepuremetalsystema ticscienceistheoneatomtheory (OA ) [2 5] ,andthatofthealloysphysicsandchemistryandalloysstatisticalthermody namicsisthecharacteristiccrystaltheory(CC) .Inordertomakethematerialsdesignstepfromempiricaltoscientificundertheguidanceofthemetallicmateri alssystemati…     

Syntheses, characteristics and fluorescence properties of complexes of terbium with benzoic acid and its derivatives

The binary complexes of terbium with benzoic acid and its derivatives (phthalic acid, iso-phthalic acid, oaminobenzoic acid, salicylic acid, sulfosalicylic acid) were synthesized and their compositions were identified by elemental analyses. UV, IR of the complexes were investigated. The UV spectra indicate that the complexes‘ ultraviolet absorption is mainly the ligands‘ absorption, but the location of peak drifts. The IR spectra show that the IR spectra of complexes are different from those of free ligands, and the band at 400 - 500 cm^-1 , due to the stretching vibration of Tb--O, is absent for free ligands. The fluorescence properties were investigated by using luminescence spectroscope, the results show that all the six complexes of terbium exhibit excellent luminescence, due to the transition from the lowest excited state ^5D4 to ^7F ground state manifold, the complexes of terbium with sulfosalicylic acid have the strongest fluorescence intensity, and is stronger than o-aminobenzoic acid-terbium, whose fluorescence intensity is regarded as the strongest one in the literature, and even stronger than some phosphor of terbium.     

Thermodynamic properties and mixing thermodynamic parameters of Ba-Al, Mg-Al, Sr-Al and Cu-Al metallic melts

Application of equations of mixing thermodynamic parameters formulated on the basis of the coexistence theory of metallic melts in Ba-Al, Mg-Al, Sr-Al and Cu-Al melts leads to fruitful results that not only the evaluated mass action concentrations agree well with the measured activities, but also the calculated mixing thermodynamic parameters are quite coincident with the experimental values. Moreover, the calculated mass action concentrations strictly obey the mass action law. The evaluated mixing thermodynamic parameters have very fine regularity: the mixing free energy is composed of standard free formation energies of all compounds and chemical potentials of all structural units at equilibrium; the mixing enthalpy consists of standard formation enthalpies of all compounds; the mixing entropy is composed of standard entropies of all compounds and configuration entropies of all structural units at equilibrium. As the equations of mixing thermodynamic parameters formulated are widely applicable to metallic melts involving compound formation, they can be used as the second practical criterion to determine whether thermodynamic models of metallic melts are correctly formulated.     

Recent progress in the determination of gallium, indium, and thallium

This mini-review covers the literatures of the determination of gallium, indium, and thallium by instrumental analysis with computer-assisted searching over the period of 1994 to 2003. Some papers appearing in the early of 2004 are also included. Because the rapid progress in the instnLment has been made, these new papers are prioritized in selection in the similar papers. The contents are considered to be separation and preconcentration, spectrophotometry, spectrofluorimetry,electroanalyses, atomic absorption spectrometry, inductively coupled plasma-atomic emission spectrometry, inductively coupled plasma-mass spectrometry and so forth.     

Thermodynamic Assessments of Ternary Ga-As-P,Ga-P-Sb,In-As-P and In-P-Sb Systems

1 ＩｎｔｒｏｄｕｃｔｉｏｎＭｕｃｈａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏⅢ Ⅴｓｅｍｉｃｏｎｄｕｃｔｏｒｃｏｍｐｏｕｎｄｓｆｏｒｄｅｃａｄｅｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｉｍｐｏｒｔａｎｔａｐｐｌｉｃａｔｉｏｎｓｉｎｏｐｔｏｅｌｅｃｔｒｏｎｉｃａｎｄｈｉｇｈｓｐｅｅｄｅｌｅｃｔｒｏｎｉｃｄｅ ｖｉｃｅｓ .Ｔｈｅｍａｔｅｒｉａｌｓｏｒｄｅｖｉｃｅｓｃａｎｂｅｇｒｏｗｎｂｙｌｉｑｕｉｄｐｈａｓｅｅｐｉｔａｘｙ (ＬＰＥ ) ,ｃｈｅｍｉｃａｌｖａｐｏｒｄｅｐｏｓｉｔｉｏｎ(ＣＶＤ) ,ｍｏｌｅｃｕ ｌａｒ…     

Synthesis,structure, and properties of a bentonite–magnetite composite

A bentonite–magnetite composite is obtained by means of bentonite intercalation with iron oxide Fe₃O₄. Using the methods of electron microscopy, low-temperature nitrogen vapor adsorption–desorption, and XRD phase analysis, the composite morphology, structure, and texture have been investigated. It is shown that the synthesized bentonite–magnetite composite can be used as a sorbent for wastewater purification from organic pollutants.     

Symposium of“Shaping and Forming of High Strength Steel,Titanium,and Light Metals”at 2010 MS&T Conference

<正>Enhancing the performance of materials under extreme conditions and promoting energy-efficient materials for manufacturing processes are two critical issues for the     

Heat Treatment and Properties of Nitrogen Alloyed, Martensitic, Corrosion-resistant Steels

This paper gives a short introduction to the typical process route and material properties of these steels in comparison to standard martensitic corrosiun-resistant steels. The typical response of these steels to various heat treatment parameters is shown and explained using the three grades M333, N360 and M340 (all made by Boehler Edelstahl GmbH) as examples, and the physical metallurgy of these steels and its consequences for practical heat treatment is explained. The correlation between tempering parameters and their effect on the toughness and corrosion properties is explained in particular detail, showing that these new steels not only offer far better properly combinations under the usual heat treatment parameters than standard martensitic corrosion-resistant steels, but that they also open the door to extending heat treatment combinations and properties.     

Structure,nitridation efficiency and magnetic properties of SmFe powders and its nitrides

The effect of annealing temperature(TA) at600-900℃ on structure and magnetic properties of the melt-spun Sm_8.6Fe_85.9Co_4.3Zr_1.2 alloys and its nitrides was investigated.Results show that the melt-spun powder is TbCu7-type SmFe₉ single phase.X-ray diffractometer(XRD) Rietveld refinement shows that the lattice parameter a increases,c and c/a decrease with the increase in T_A at600-700℃.This is due to the tendency of nitrogen entering ...     

Shandong University Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education of China

In 1995, the Key Lab of Liquid Structure andHeredity of Metals was set up by the approval ofShandong province, but the research work on theliquid structure and heredity of materials startedin the last three decades. In 2000, combining thelab of engineering ceramic and the institute ofjoining technology in Shandong University, thelab was established as Key Lab of LiquidStructure and Heredity of Materials, by theapproval of the Ministry of Education.Currently, prof. Zhuangqi HU, prominen…     

Effects of hot extrusion and annealing treatment on microstructures, properties and texture of AZ31 Mg alloy

Effects of extrusion deformation and heat treatment on microstructures, mechanical properties and texture of AZ31 Mg alloy were investigated. The results show that the microstructuses of as-cast AZ31 alloy are markedly refined aider hot extruding, the average grain size is about 25 μm and strong fiber texture （10 1 0） exists in the extruded AZ31 alloy. The mechanical properties are improved obviously. The grain size is somewhat inhomogeneous and strip structure emerges along the extrusion direction due to incomplete dynamic recrystallization during the extrusion process. With increasing annealing temperature, the small grain grows up and turns into equiaxed grain, and the texture is weakened with the visible growing up of grains.     

Microstructure, mechanical properties and age-hardening of Mg-Li alloy sheets

Mg-（5-22）（mass fraction, %）Li alloys with Zn addition were produced and studied. The density of studied alloys is 1.19- 1.62 g/cm^3. It is found that the alloy has excellent cold-workability and can be rolled to thin sheets at room temperature. The tensile tests were carried out at various tensile temperatures and strain rates. It is remarkable that the superplasticity occurs during uniaxial tensions at 150℃. In addition, the sheet is very sensitive to strain-rate even at room temperature. The age-hardening of the sheets at room temperature and 50℃ was investigated. The hardening may be caused by the precipitation of MgLi2Zn phase, and overaging occurs owing to the phase transformation from MgLi2Zn to MgLiZn observed by X-ray diffractometry.     

Electrolytic surface hardening of steel, cast iron and aluminium-bronze

T he electrolytic hardening is quite a m odern heat treatm entprocess,which can be applied to ferrous and non-ferrous alloys like alum inum bronzes. The norm al surfacehardeningprocessesare: (1)Flam ehardening (2)Induction hardening. (3)Laserhardening (4)Electrolytichardening H owever,out of the above four last two m ethods are m ore m odern.In this paperm odern process electrolytic hardening hasbeen discussed.Theeffortshavebeen m adeto setvarious process param eters, which give new approach…     

Surface tension of molten Ni-（Cr, Co, W） alloys and segregation of elements

Surface tension of molten Ni-(Cr, Co, W) alloys was measured at the temperature of 1 773-1 873 K in an Ar+3%H2 atmosphere using an improved sessile drop method. The segregation of Cr, Co and W in alloy was calculated and analyzed using Butler's equation. The results show a good agreement between measured and calculated data. The surface tension of molten Ni-(Cr,Co, W) alloys decreases with increasing temperature. In Ni-(Cr, Co, W) alloys, the element with lower surface tension tends to segregate on the surface of molten alloy while that with higher surface tension tends to segregate inside of the molten alloy. The larger the differences in surface tension, atom radius and electron configuration between solvent and solute are, the more significant the segregation is. As a result, Ni segregates onto the surface and Co and W segregate inside the alloys.     

Evaluation of TiO2 Nanoparticles Concentration and Applied Current Density Role in Determination of Microstructural,Mechanical, and Corrosion Properties of Ni–Co Alloy Coatings

Protection of Metals and Physical Chemistry of Surfaces - The goal of the present investigation is to evaluate the influences of plating parameters such as TiO2 nanoparticles concentration in the...     

Review Recent progress in the determination of gallium, indium, and thallium

This mini-review covers the literatures of the determination of galliumindiumand thallium by instrumental analysis with computer-assisted searching over the period of 1994 to 2003. Some papers appearing in the early of 2004 are also included because the rapid progress i nthe instrument has beeen made these new papers are peioritized in selecton in the simiar papers the contents sre considered to be separation and preconcentra sepectrophotomaetry electroanalyses atomic absorption spectrometry inductively coupled plasma-atomic emission spectrometry inductively coupled plasma-mass spectrometry and so forth