Structural vacancy distribution in the crystal lattice of the tetragonal V52O64 superstructure which is formed on the basis of disordered superstoichiometric cubic vanadium monoxide VOy≡VxOz is experimentally determined and the presence of significant local atomic displacements and large local ...

The dose dependence on crystal structures and lattice parameters of carbon-implanted layers of polycrystalline titanium, vanadium and chromium plates has been investigated by X-ray diffraction (XRD) measurements. Implantations of 12C+-ions were performed at doses between 1 × 1017 and 2 × 1018 ...

Inter-particle neck growth kinetics of vanadium carbide powder during initial stages of conventional and spark-plasma sintering has been investigated. Vanadium carbide (V8C7) micron-size powder has been subjected to both Free Pressureless Spark Plasma Sintering (FPSPS) and conventional sintering...

In this paper we will report the results obtained by femtosecond Pulsed Laser Deposition on vanadium carbide. These results, compared with those obtained for another group 5 carbide, tantalum carbide, evidence large analogies between the two systems. Optical emission spectroscopy shows in both c...

The crystal structure, micro- and nanostructure of coarse- and nanocrystalline powders of ordered vanadium carbide V8C7 have been examined by X-ray and neutron diffraction and electron microscopy methods. The synthesized coarse-crystalline powder of ordered vanadium carbide has flower-like morph...

In this study, nano crystalline vanadium carbide was synthesized by mechanical alloying method. V2O5, C and Mg powders were placed in a planetary ball mill and sampled after different milling times. XRD and FESEM were used for characterization of synthesized powder. Studies showed that crystalli...

Crystal orbital (CO) schemes are proposed for presenting the chemical bonding in solids. The CO scheme, based on the total DOS curve, shows interactions controlling main features of the electronic structure of a solid compound in a compact form. Its construction must be preceded by a detailed an...

WC-TiC composite with six different values of TiC in the range 1–15 wt% was prepared by arc plasma (Ar) melting. Characterizations of the in situ melt-cast composite as well as its powder by XRD, FESM, TEM, SAED and EDS show the composite to consist of related carbide, sub-carbide and mixed car...

Coatings obtained by electron-beam overlaying of “titanium - titanium carbide” composite powders were investigated. The composite powders have been prepared by self-propagating high-temperature synthesis (SHS) in titanium and carbon reactive powder mixtures. Structural studies of the powders s...

Diamond is a great importance material for the industry because of its physical and chemical properties. One of the applications that it is utilized a large scale is the cutting of ornamental rocks. This activity exposes them to ideal conditions for the occurrence of two phenomena responsible fo...

The carburizing of tantalum samples under different carbon flow rates has highlighted the influence of the carbon flow rate on the structure of tantalum carbides. XRD analyses enabled the identification of surface structures that were revealed by optical micrographs. Four carbon flow rates were ...

Salecan is a linear microbial polysaccharide obtained from the fermentation of Agrobacterium sp. ZX09. Salecan is suitable for the preparation of hydrogels for biomedical applications, given its prominent physicochemical and biological properties. Herein, we described a novel microwave-assisted ...

Sintering kinetics and densification of tantalum carbide (TaC) based ultra-high temperature ceramics (UHTC) processed using spark plasma sintering (SPS) were investigated. Samples sintered in the temperature ranging from 1600 °C to 2300 °C for 15 min under uniaxial pressure of 50 MPa showed in...

Tantalum carbide (TaC) nanopowders were synthesized by a novel method combining the sol–gel and spark plasma sintering (SPS) processes using tantalum pentachloride (TaCl5) and phenolic resin as the sources of tantalum (Ta) and carbon (C), respectively. Gels of Ta-containing chelate with good un...

Tantalum carbide ceramics with high volume fractions of the ζ-Ta4C3 phase have been shown to exhibit high fracture strength and toughness as compared to those in absence of this phase. In this work, we investigated how microcracks propagated in this these high toughness ceramics using Knoop and...

Tantalum carbide (TaC) was synthesized by polycondensation and carbothermal reduction reactions from an inorganic hybrid. Tantalum pentachloride (TaCl5) and phenolic resin were used as the sources of tantalum and carbon, respectively. FTIR of as-synthesized dried complexes revealed formation of ...

Tantalum carbide (TaC) nanofibers and coatings were synthesized using multiwall carbon nanotubes (MWCNTs) with different structures as templates and the carbon source in a KCl-LiCl molten salt mixture (41.2/58.8 mol/mol). The TaC and MWCNTs were characterized by scanning electron microscopy, tra...

Polycrystalline tantalum-carbide-incorporated diamond coatings have been made on unpolished side of Si (100) wafer by hot filament chemical vapor deposition process. Morphology of the coatings has been found to vary from (111) triangular-facetted to predominantly (111) square-faceted by increasi...

With the increase in the national and world energy demand, we have sought the development of new processes of energy production that have a positive cost-benefit ratio with low environment risk, and that is ease for transportating and using. In recent years transitional metal carbides have recei...

Depolymerization of lignin into aromatic compounds in high yield for production of fuels and chemicals is vital to realize an economically competitive biorefinery. In this study, undoped and nickel-doped bulk molybdenum carbides were synthesized and evaluated in reductive depolymerization of lig...