Materials Literature
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Binder removal characteristics of injection molded zirconia (ZrO2) ceramics in the form of one-closed end tubes were studied by thermal analysis methods such as thermogravimetry and calorimetry. Only a thermal teratment for the binder removal from the molded parts with thin walls is not suitable because of deformation…
Abstract. Several ceramic materials have been chosen and synthesized by Selective Fusion by Laser (SFL). These materials have been selected because their refractory condition, high hardness and good colouring power, that make them useful to be used as ceramic pigments. In the present work it is shown the structural an…
Abstract. Fine ceramics such as SiC, Si3N4 and ZrO2 and hard ceramic coatings such as DLC and CNx show attractive tribological properties of low friction and low wear in vacuum, air or water which cannot be observed with metals. Some typical observations are introduced and mechanisms are discussed in this paper.
Infrared (IR) absorption spectroscopy has been used to probe the evolution of microscopic vibrational states upon the temperature- and photo-induced spin crossovers in [Fe(2-picolylamine)3]Cl2EtOH (Fe-pic). To overcome the small sizes and the strong IR absorption of the crystal samples used, an IR synchrotron radiatio…
Abstract. Corrosion measurements on a set of alumina-mullite-zircon refractories have been carried out using a static crucible test consisting of a “hole in a block”. Rates of corrosion of the refractory at 1370 °C for 72 h by a standard soda-lime glass were evaluated by measuring selected dimensions within the hole,…
Colourless single crystals of Na3YCl6, crystallizing in the cryolite structure type and isotypic with Na3GdCl6-II and Na3MCl6 (M = Sc, Dy–Lu), were prepared from a flux of YCl3, NaCN and NaN3; the trivalent yttrium is octahedrally coordinated by chlorine atoms with an average Y—Cl distance of 2.62 Å. The Y atom and on…
The complete oxidation of Bi 2 S 3 in the temperature range from 50 to 1000 °C was studied using a combination of temperature-programmed oxidation mass spectrometry (TPO-MS) and in situ X-ray diffraction (XRD). The TPO-MS oxygen consumption and SO 2 liberation profiles exhibit three peaks with onset temperatures at 44…
Spark Plasma Sintering (SPS) has been successfully applied in the sintering of nanocrystalline BaTiO3 and γ-Al2O3 in order to reach fully dense nanostructured ceramics at moderate pressure and temperature. BaTiO3 compacts with densities exceeding 97% and grain size of 50 nm have thus been prepared at temperatures not…
or the rest of the paper, please use Times New Roman 12 Abstract. A new class of electroconductive materials, constituted by an insulating matrix (a composite AlN-SiC) that contains 30 vol % of an electroconductive phase (MoSi2, ZrB2, or ZrC), was densified through hot pressing and characterized. Toughness, hardness,…
Mullite whiskers were produced by firing of kaolin at 1400o-1550oC. CuSO4 was used as fluxing agent. Before firing, spray drying and baking with flour and leaven were employed to give free space to the powders. The influence of preparation parameters and firing temperature on the crystalline structure and phase transf…
Abstract. Shape memory alloys transform at low temperature by a martensitic reaction , which implies formation of a domain structure (similar to ferromagnetic, ferroelectric transformations). This microstructure allows complex pseudo-plastic deformability (high degree of freedom). Reversion of into restores a definite…
Abstract. Nanoparticles of phase-pure tetragonal ZrO2 are obtained by means of a water-based solution-gel route. By coordinating the Zr4+-ion in a peroxo-citrato-complex, a stable aqueous Zr-precursor is prepared which is transformed into an amorphous gel by evaporation of the solvent. The gel is subsequently thermall…
In this paper, a thermal-optical light modulator was developed based on a surface micromachined vanadium dioxide (VO 2 ) array. VO 2 thin film undergoes a reversible semiconductor-to-metal phase transition at about 68 °C, which is accompanied by an abrupt transformation from a transparent semiconductor phase at low te…
Samples of Na(13)(Cd(1-x)Tl(x))(27) crystallize with a cubic Bergman-type Im3 structure (formerly called the R-phase) (Z = 4, a approximately 15.92 A) and exhibit a small phase width, 0.24 < x < 0.33. The crystal structure exhibits a Cd/Tl (=M) network of concentric empty M(12) and Cd(12) icosahedra and M(60) buckybal…
Humic acids (HAs) form coatings on clays and minerals that can play an important role in nutrient and contaminant migration in soil and water. Humic acid-clay mineral interactions are known to be affected by pH and ionic strength, but little attention has been paid to the effects of temperature. In this paper we repor…
The deprotonated form of the pyrazine-2,3-diselenol (pds) ligand, pds(2-), reacts with Ni(II) inorganic salts to form the nickel compounds [Ni(II)(pds)(2)](nBu(4)N)(2) (1), [Ni(II)(pds)(2)]Na(2).2H(2)O (2), and [Ni(III)(pds)(2)](2)Na(2).4H(2)O (3), depending on the reaction conditions. They are characterized by NMR, E…
Air-stable Fe/Fe 3 C nanocrystalline particles have been prepared by sonicating Fe(CO) 5 in diphenylmethane solutions under argon and subsequently annealing the amorphous as-prepared product in an inert atmosphere. Changing the sonication conditions and annealing temperature allows control of the size of the particles…
In the present article, we discuss the results of investigations of the influence of hydrostatic pressure (up to 1.2 GPa) on the spin transition behavior in [Fe(phen) 2 (NCS) 2 ] polymorph II and [CrI 2 (depe) 2 ]. It is demonstrated that pressure effect studies are very helpful in elucidating the mechanism of coopera…
We present a theoretical and numerical study of the quasi-static motion of large wetting bubbles in microfluidic channels with contractions. In most cases the energy of a bubble increases when it is moved from a wide channel to a narrow one, and the bubble thus tends to clog the flow of the fluid. A certain pressure,…
[reaction: see text] Titration of porphyrin-fullerene rotaxanes with DABCO or 4,4'-bipyridine led to photo- and redoxactive catenanic architectures, which upon photoexcitation undergo a sequence of short-range energy and electron transfer events to give a long-lived charge-separated radical-pair state.