Materials Literature
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Different types of dense β‐Si 6− z Al z O z N 8− z ( z =1, 1.5, 2, 2.5, 3, 3.5, and 4) ceramics have been prepared following a conventional reaction sintering process at 1675°–1700°C using α‐Si 3 N 4 , α‐Al 2 O 3 , AlN, and 3–7‐wt% Y 2 O 3 as raw materials. Sintered materials were thoroughly characterized for bulk den…
Recently, the fabrication and development of novel solid oxide fuel cell (SOFC) structures were conducted with the aim of enhancing power generation. Newly cathode‐supported honeycomb‐type SOFC with a promising power/volume ratio is under development. However, the conventional processing techniques used for the fabric…
Combined CV studies and UV-Vis-NIR spectroelectrochemical investigations revealed an unusual stability of the p- and n-doped PMOThOD in the wide potential window of 4 V. The n-doping process occurs in this polymer down to -2.7 V (vs. Ag/Ag+) in a non-destructive way with the characteristic development of the omega3 tr…
The resistance switching characteristic and electric displacement-voltage hysteresis loop have been observed in BaTiO3−δ∕Si p-n heterostructures fabricated by laser molecular beam epitaxy. The ferroelectric response of BaTiO3−δ can be enhanced by the interface polarization of the junction. The resistance switching pro…
The dynamic polar nanoregions (PNRs) which form below the Burns temperature and determine the unique properties of relaxor ferroelectrics were predicted [Tinte et al., Phys. Rev. Lett. 97, 137601 (2006)] to be pinned to the quenched chemically ordered regions (CORs) usually observed in lead-containing relaxors. In Pb[…
Abstract A novel η 6 ‐complex of N ‐allylcarbazole containing chromium tricarbonyl was synthesized. This complex was hydrosilylated with polymethylhydrosiloxane to afford a substituted polymer. Both the complex and the polymer were characterized by classical spectroscopy techniques (FTIR, NMR, and UV–vis), gel permeat…
Abstract Mixed spinel ferrites Zn 0.5 Co 0.5 Fe 2 O 4 (Zn‐Co) and Zn 0.5 Ni 0.5 Fe 2 O 4 (Zn‐Ni) thin films were prepared on silicon (100) substrates by pulsed laser deposition (PLD) technique, operating at 248 nm. Single phase formation of spinel structure was confirmed by X‐Ray Diffraction (XRD). Optical measurement…
The energy band structure of a transparent, green, room-temperature ferromagnetic FeBO3 has been calculated using density functional theory within the generalized gradient approximation (GGA) and the GGA+U approach. The electronic structure of FeBO3 is predicted to be antiferromagnetic and insulating, both in perfect…
The spontaneous decay process of a two-level atom embedded in a one-dimensional structure containing left-handed material (LHM) is investigated. We first consider the case of the atom being in front of a LHM layer mounted on a mirror, where it has been claimed that the atomic decay would be inhibited completely. Here…
The nonisothermal kinetics of thermal decomposition of SrCO 3 and BaCO 3 was studied by thermo‐gravimetry following non‐Arrhenius integral approach of Harcourt and Esson. Variation of activation energy of these two carbonates with fraction decomposition was compared and the average activation energy in the decompositi…
We report the synthesis of microscopic α‐SiC ribbons (belts) on the surface of a graphite rod at 1800°–1900°C by a carbothermal process. The width of the ribbons produced ranged from 500 nm to 5 μm and the aspect ratio was up to 400. The ribbon thickness ranged from 50 to 800 nm. Their growth mechanism was explained b…
Abstract Structure, morphology and optical properties of ZnO thin films grown by electrodeposition under different conditions changing both solvent (water or dimethylsulfoxide) and substrate (polycrystalline FTO or monocrystalline GaN) are reported. The results point out the advantage of using dimethylsulfoxide when u…
Abstract In the framework of the foam process modelling, this paper presents a numerical strategy for the direct 3D simulation of the expansion of gas bubbles into a molten polymer. This expansion is due to a gas overpressure. The polymer is assumed to be incompressible and to behave as a pseudo‐plastic fluid. Each bu…
Equiaxed yttrium–lanthanum phosphate nanoparticles (Y 0.7 ,La 0.3 )PO 4 ·0.7H 2 O were made and used to continuously coat Nextel ™ 720 fiber tows. The particles were precipitated from a mixture of yttrium and lanthanum citrate chelate and phosphoric acid (H 3 PO 4 ), and characterized with differential thermal analysi…
The dependence of the electrical conductivity of pure (99.999%) and tin‐doped indium oxide (In 2 O 3 ) ceramics on oxygen partial pressure was investigated at 800° and 850°C. The doping amount of tin was 100–1000 ppm, which is within the solubility limit at the temperatures measured. The conductivity of doped ceramics…
Utilizing the ion beam of a focused ion beam (FIB)/scanning electron microscope (SEM) microscope to investigate non-conductive samples, we observe a mirror image very much similar to the one that is commonly obtained with the electron beam and the same samples. To our knowledge this is the first observation of what ca…
Small angle x-ray scattering has been used to investigate the in situ immersive wetting of ultrarough surfaces which exhibit superhydrophobicity with extreme water contact angle (θA=169°). Reduced scattering contrast observed from rough surfaces when partially or totally wetted reveals significant physical differences…
The bulk moduli of some superhard materials were calculated by using the chemical bond method. For simple crystals, such as diamonds, c-BN, SiC, Si, BP, and Ge, the calculated results agree with experimental and theoretical values. For crystals of complex structure, such as β-BC2N crystal and various structural C3N4 c…
The magnetic properties of doped pellets of poly(3-methylthiophene) showing room temperature ferromagnetic behaviour have been discussed in a previous article. The magnetic behaviour was attributed to a weak ferromagnetic phase, due to the superexchange interaction of polarons via the dopant anions. The Dzialoshinsky–…
Porous γ‐alumina with a bimodal pore size distribution has been developed by adding nanosized polystyrene beads to boehmite sol as templating units. The primary pore diameter is in the range of 4–6 nm and the secondary pore diameter is ca. 50 nm with minor pore shrinkage. The unsupported γ‐alumina with different porou…