Materials Literature
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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.
The author's earlier work on dynamical response of ferroelectrics [Prog. Theor. Phys. 44 (1970) 1477] is extended to incorporate relaxational response into the anharmonic-oscillator model. Dynamical polarizability of an oscillator in a double-minimum potential inevitably possesses a vanishing imaginary component propo…
Adsorption of NO and coadsorption of NO and O2 on H-ZSM-5 have been studied at low and room temperature by means of FTIR spectroscopy. For better interpretation of the spectra, experiments involving isotopic labeled molecules have been performed. Low temperature adsorption of NO on H-ZSM-5 results initially in formati…
Using chemical-state-specific scanned-energy-mode photoelectron diffraction (PhD) from O 1s and C 1s photoemission, we have determined the local structure of the surface species produced on the rutile TiO 2 (110) surface as a result of room temperature exposure to formic acid. The results show clear evidence for the c…
In this study, highly permeable ion-selective membranes are prepared via immobilization of polyelectrolyte multilayer networks within the inner pore structure of a microporous (pore size = 0.2 microm) support. Electrostatic layer-by-layer assembly is achieved through alternate adsorption of cationic and anionic polyel…
The highly electron-deficient, beta-octafluorinated meso-tetrakis(pentafluorophenyl)-porphyrin (H(2)F(28)TPP) was metalated with platinum to afford the oxidatively robust luminophore [PtF(28)TPP], and its X-ray structure shows that the porphyrin core exists in a slightly saddle-shaped conformation. The absorption spec…
The structure of vaterite-type rare earth orthoborate (LnBO 3 ) has long been a subject of interest and controversy. In the present work, the crystal structures of two polymorphs of the vaterite-type rare earth orthoborates, i.e., the low- and high-temperature modifications of (Y 0.92 Er 0.08 )BO 3, were solved and re…
We study inelastic electron tunneling through a molecular junction using the non-equilibrium Green function (NEGF) formalism. The effect of the mutual influence between the phonon and the electron subsystems on the electron tunneling process is considered within a general self-consistent scheme. Results of this calcul…