نتایج جستجو برای: vanadium loading

تعداد نتایج: 84124  

2009
Christian Lorber

The synthesis and solution and solid-state structural characterization of a family of amine bis(phenolate) [ONNO]-vanadium complexes is reviewed. These compounds have oxi dation states ranging from vanadium(II) to vanadium(V), and were evaluated as olefin polymerization catalysts. In association with EtAlCl2 cocatalyst, we studied the homo polymerization of ethylene, propene, and 1-hexene, as w...

2003
Y. Huttel G. van der Laan C. M. Teodorescu P. Bencok S. S. Dhesi

We report the observation of a magnetic moment on vanadium embedded in copper. Using x-ray-absorption spectroscopy and x-ray magnetic circular dichroism we show that the vanadium atomic magnetic moment is strongly dependent on the formation temperature of the VCu alloy. The absorption spectra allow us to distinguish the electronic transitions which are the signature of the magnetic state from t...

2009
Hongfang Shen Qing Guo Zhiman Zhao Guozhong Cao

The present research investigated the sol–gel preparation, dielectric and ferroelectric properties of PZT films doped with 5 mol% vanadium oxide. Stable PZTV sols can be readily formed, and homogeneous, micrometer thick and pinhole-free PZTV films were obtained by using spin coating followed with rapid annealing. The X-ray diffraction patterns revealed that no parasitic or secondary phases were...

Journal: :Dalton transactions 2016
Ryan D Desautels Michael P Rowe John W Freeland Michael Jones Johan van Lierop

FeCo nanoparticles (4 ± 1 nm), encapsulated by SiO2, were synthesized with and without a 2% (atomic ratio) vanadium doping. The impact from the presence of vanadium, an additive often used in the bulk to alter both physical and mechanical properties, on the nanomagnetism was probed by element-specific X-ray spectroscopy and magnetometry techniques. While the nanostructure was unaffected by the ...

2010
ASPHALTITES I. AYDIN F. AYDIN E. KILINC C. HAMAMCI

Vanadium is found in many rocks and minerals, including asphaltite. Asphaltite is one of the naturally occurring black, solid bitumens, which are soluble at heating in carbon disulfide and fuse. Asphaltite is also a solidified hydrocarbon compound derived from petroleum. Determination of vanadium in asphaltite ash was performed by microwave-acid digestion followed by inductively coupled plasma-...

2009
Masahiro Tahashi Zunyi Wu Hideo Goto Youji Hayashi Toshiyuki Ido

Vanadium-doped ZnSe films were epitaxially grown on (100) GaAs substrates by metal-organic vapor phase epitaxy. The crystal structure and the state of vanadium in the ZnSe crystal were investigated using X-ray diffractometry, infrared absorption, and photocurrent. It was revealed that zinc sites in the ZnSe crystal were substituted by vanadium atoms on the basis of the results of infrared absor...

2003
Nathalie Calin Christian Serre Slavi C. Sevov

The title compound was hydrothermally synthesized from elemental vanadium, phosphoric and boric acids, and ethylenediamine. It is isostructural with the mixed-valence titanium phosphate TiTi(HPO4)4?enH?H2O (TPO-2) but differs in electronic states and in its magnetic properties. The structure [tetragonal, I41, a ~ 6.3881(4) and c ~ 16.608(1) Å] is of the open-framework type and is composed of co...

2017
Zhenhua Sun Jingqi Zhang Lichang Yin Guangjian Hu Ruopian Fang Hui-Ming Cheng Feng Li

Although the rechargeable lithium-sulfur battery is an advanced energy storage system, its practical implementation has been impeded by many issues, in particular the shuttle effect causing rapid capacity fade and low Coulombic efficiency. Herein, we report a conductive porous vanadium nitride nanoribbon/graphene composite accommodating the catholyte as the cathode of a lithium-sulfur battery. ...

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