Nanoparticles of potassium tantalate (KTaO3) and potassium niobate (KNbO3) were synthesized by oxidation of metallic tantalum in molten potassium nitrate with the addition of potassium hydroxide. Magnetization curves obtained on these ferroelectric nanoparticles exhibit a weak ferromagnetism, while these compounds are nonmagnetic in a bulk. The experimental data are used as a start point for th...

The stable configurations, electronic structure and magnetic properties of B16N16, B8C24, Al and P inserted (BC3)8 was studied by performing density functional theory (DFT) calculations of the NMR parameters. The results indicate that B8C24 has semiconductivity property and be effectively modified by inserti...

A study of the factors influencing the stability of typhus rickettsiae in vitro, initiated several years ago (Bovarnick et al., 1950), has been extended with the aim of ultimately achieving growth in vitro of these organisms. During these experiments it was noted that survival was increased consistently by addition of diphosphopyridine nucleotide (DPN) to the basal medium. In addition, diphosph...

Determination of the radionuclide iodine 129 using ICP-MS has been improved by the use of an Octopole Reaction System (ORS) ICP-MS, operated in oxygen cell mode. Oxygen reaction gas removes the background signal at m/z 129, which is due to the presence of Xe as an impurity in the Ar plasma gas and to the polyatomic ion IH2. NIST SRM standards with different 129I/127I ratios and at multiple conc...

We have shown earlier, that an oxygen impurity content of >0.4 at.% (4000 ppm) strongly degrades the hardness of the nc-TiN/a-Si3N4 nanocomposites. Here we show that such impurities also hinder the phase segregation and formation of stable and strong nanostructure consisting of 3-4 nm size TiN nanocrystals "glued" together by about 1 monolayer thick interfacial Si3N4-like layer, thus apparently...

The high manufacturing cost for metallic glasses hampers actual commercial applications of this class of fascinating materials. In this letter, the effect of oxygen impurity on the glass forming ability and tensile properties of Zr-BMG composites were studied. Our results have demonstrated that oxygen was absorbed and concentrated only in the precipitated β-Zr phase, leading that the remainder ...

The gas phase reaction of trimethylgallium (TMG) with ammonia was investigated because of its importance in the GaN chemical vapour deposition process. Water is the most important impurity in ammonia and therefore its reaction with TMG was investigated as a source of oxygen impurities in GaN Ðlms. Gas phase intermediates were studied in a Ñow tube reactor in the temperature range 294 to 1000 K ...