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Heterogeneous Acid Catalytic Esterification by Porous Polyoxometalate-tantalum Pentoxide Nanocomposites许蕾蕾1,GUOYihang2,MA Huiru1,官建国11. State Key Laboratory of Advanced Technology for Materials... in both redox and acid catalysis reactions since its catalytic features can be controlled at a molecular level. We investigated POM (POM = H3PW12O40 ) on tantalum pentoxide (Ta2O5) via hydrolysis......
in region A contains oxygen while in other positions (such as region B), the main component is free carbon, together with rare oxygen and small amount of tantalum. This implies that at the initial stage... and tantalum. With the increase of ablation time, the melt is oxidized to low valent tantalum-oxide and Ta2O5 is formed finally. During the melt cooling, needle-like crystals of Ta2O5 are precipitated......
世界采矿冶金大事记(五)梅建军摘 要:<正> 1800年,英国人斯坦诺普发明最早的全铁制印刷机,即斯坦诺普印刷机. 同年,军事工业开始使用金属锑制造榴散弹. 1801年,英国化学家哈契特(C.Hatchett)在分析矿石时发现一种新元素,因矿石来源于哥伦比亚(Columbia),故将新元素命名为Columbium(钶).1844年,德国化学家罗斯(H.Rose)宣称发现一种性质与金属钽(tantalum)很相似的"新"元素,因钽是以希腊神话人物Tantalus命名的,所以就以Tantalus女儿Niobe(尼奥柏)的名字给新元素定名为niobium(铌),1866年确定钶和铌是同一个元素.1951年国际化学联合关键词:......
; 文献标志码:A 文章编号:1672-7207(2011)11-3251-05 Direct electrosynthesis of pentakis(diethylamido)tantalum using sacrificing anode ...: Pentakis(diethylamido)tantalum(Ⅴ) was synthesized by electrochemical reactions of diethylamine in which diluted solvent of AB at sacrificial tantalum anode in the presence of tetrabutylammonium bromide......
forward. The multiple-structure made of alloying and coating layers of tantalum was achieved on the surface of TC4 (Ti6Al4V) using this method in double glow surface alloying process. The tantalized......
" phase was found at the boundary of the cellular structures,where the tantalum content was not high enough to suppress the bcc lattice transition completely but could suppress the β phase→α’ phase......
on tantalum foils by electrodeposition and heat treatment using RuCl3·3H2O as precursor. surface morphology, composition change and cyclic voltammetry from precursor to amorphous and crystalline RuO2·nH2O......
method was suggested to obtain high-concentration LiTaO3 precursor solution for simplified experimental conditions and thicker films, by mixing lithium acetate and tantalum ethoxide in a 1, 2-Propylene... with a stronger preferential orientation were obtained in 1, 2-Propylene glycol due to its higher boiling point and slower volatilization rate. On the other hand, the diffraction peak intensity of LiTaO3......
, niobium and tantalum can be comprehensively recycled as associated elements.Rubidium and other rare metals can be effectively enriched through recovering of mica minerals, indicating that Changchengling... Mining Corporation, Chenzhou 424200, China) Abstract: Changchengling deposit in southern Hunan was a newly discovered super-large rubidium deposit, which was associated with Li, Nb, Ta and other rare......
on the pretreated NiTi alloy by the sol–gel method. Thermal analyses indicate that the evaporation temperature of the organics decreases with the addition of tantalum ethoxide in the TiO2 sol......
