Physical and mechanical properties of highly textured polycrystalline NbAlC ceramic.

Highly textured polycrystalline NbAlC ceramic was fabricated by slip casting in a strong magnetic field followed by spark plasma sintering. Its Lotgering orientation factor was determined on the textured top and side surfaces as ∼1.0 and =0.

Photoluminescence properties of β-SiAlON:Yb, a novel green-emitting phosphor for white light-emitting diodes.

We have synthesized Yb-activated Si Al O N (0.05⩽⩽2.3, 0.

Potential use of only YbO in producing dense SiN ceramics with high thermal conductivity by gas pressure sintering.

YbO is an efficient sintering additive for enhancing not only thermal conductivity but also the high-temperature mechanical properties of SiN ceramics. Here we report the fabrication of dense SiN ceramics with high thermal conductivity by the gas pressure sintering of α-SiN powder compacts, using only YbO as an additive, at 1900 °C under a nitrogen pressure of 1 MPa. The effects of YbO content, sample packing condition and sintering time on the densification, microstructure and thermal conductivity were investigated.

An efficient and biocompatible fluorescence resonance energy transfer system based on lanthanide-doped nanoparticles.

This work demonstrates an efficient and bio-friendly fluorescence resonance energy transfer (FRET) system based on lanthanide-doped inorganic nanoparticles. A facile aqueous route was used to synthesize the CePO(4):Tb nanorods with homogeneous colloidal dispersion, which emits a bright green light with a high quantum yield (∼0.36) and a long fluorescence lifetime (∼3.

Electric current activated/assisted sintering (): a review of patents 1906-2008.

The electric current activated/assisted sintering () is an ever growing class of versatile techniques for sintering particulate materials. Despite the tremendous advances over the last two decades in ed materials and products there is a lack of comprehensive reviews on apparatuses and methods. This paper fills the gap by tracing the progress of technology from 1906 to 2008 and surveys 642 patents published over more than a century.

Effect of starting powders on the sintering of nanostructured ZrO ceramics by colloidal processing.

The effect of starting powders on the sintering of nanostructured tetragonal zirconia was evaluated. Suspensions were prepared with a concentration of 10 vol.% by mixing a bicomponent mixture of commercial powders (97 mol.

On-chip diamagnetic repulsion in continuous flow.

We explore the potential of a microfluidic continuous flow particle separation system based on the repulsion of diamagnetic materials from a high magnetic field. Diamagnetic polystyrene particles in paramagnetic manganese (II) chloride solution were pumped into a microfluidic chamber and their deflection behaviour in a high magnetic field applied by a superconducting magnet was investigated. Two particle sizes (5 and 10 μm) were examined in two concentrations of MnCl (6 and 10%).

Numerical simulation of chainlike cluster movement of feeble magnetic particles by induced magnetic dipole moment under high magnetic fields.

In this paper, the motion of a chainlike cluster of feeble magnetic particles induced by high magnetic field is discussed on the basis of the results of numerical simulations. The simulations were performed on glass particles with a diameter of 0.8 mm; and the viscosity, applied magnetic field and magnetic properties of the surrounding medium were changed.

Control of lattice spacing in a triangular lattice of feeble magnetic particles formed by induced magnetic dipole interactions.

We studied methods of controlling the spacing between particles in the triangular lattice formed by feeble magnetic particles through induced magnetic dipole interaction. Formation of a triangular lattice is described by the balance between the magnetic force and the interaction of induced magnetic dipoles. The intensity of the magnetic force is proportional to the volume of particles and the difference in the magnetic susceptibilities between the particles and the surrounding medium Δχ.

Magnetic orientation and magnetic anisotropy in paramagnetic layered oxides containing rare-earth ions.

The magnetic anisotropies and easy axes of magnetization at room temperature were determined, and the effects of rare-earth (RE) ions were clarified for RE-based cuprates, RE-doped bismuth-based cuprates and RE-doped Bi-based cobaltite regarding the grain orientation by magnetic field. The easy axis, determined from the powder orientation in a static field of 10 T, depended qualitatively on the type of RE ion for all three systems. On the other hand, the magnetization measurement of the -axis oriented powders, aligned in static or rotating fields, revealed that the type of RE ion strongly affected not only the directions of the easy axis but also the absolute value of magnetic anisotropy, and an appropriate choice of RE ion is required to minimize the magnetic field used for grain orientation.

Textured silicon nitride: processing and anisotropic properties.

Textured silicon nitride (SiN) has been intensively studied over the past 15 years because of its use for achieving its superthermal and mechanical properties. In this review we present the fundamental aspects of the processing and anisotropic properties of textured SiN, with emphasis on the anisotropic and abnormal grain growth of β-SiN, texture structure and texture analysis, processing methods and anisotropic properties. On the basis of the texturing mechanisms, the processing methods described in this article have been classified into two types: hot-working (HW) and templated grain growth (TGG).

An innovative energy-saving in-flight melting technology and its application to glass production.

The conventional method used for glass melting is air-fuel firing, which is inefficient, energy-intensive and time-consuming. In this study, an innovative in-flight melting technology was developed and applied to glass production for the purposes of energy conservation and environmental protection. Three types of heating sources, radio-frequency (RF) plasma, a 12-phase alternating current (ac) arc and an oxygen burner, were used to investigate the in-flight melting behavior of granulated powders.

observation of magnetic orientation process of feeble magnetic materials under high magnetic fields.

An microscopic observation of the magnetic orientation process of feeble magnetic fibers was carried out under high magnetic fields of up to 10 T using a scanning laser microscope. In the experiment, carbon fibers and needle-like titania fibers with a length of 1 to 20 μm were used. The fibers were observed to gradually orient their axes parallel to the direction of the magnetic field.

Urea coordinated titanium trichloride Ti(III)[OC(NH)2]6Cl3: a single molecular precursor yielding highly visible light responsive TiO2 nanocrystallites.

A coordination complex, Ti(III)[OC(NH2)2]6Cl3, was first synthesized via reacting hot alcoholic solutions of TiCl3 and urea, which was subsequently employed as a molecular precursor for nanocrystalline TiO2 via thermal decomposition. Fourier transform IR spectroscopy confirmed C=O-->Ti coordination bond formation, while Rietveld refinement revealed a hexagonal crystal structure (space group: Pc1) for the complex with a = b = 16.438(4) A, c = 15.