Materials Literature
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Response of various elasto-plastic models is compared at large strains under cyclic loading. In contrast to the small strain case, the cyclic instability is observed at large strains for some elasto-plastic material models with a kinematic hardening. The cyclic instability manifests itself as changing of shape, size o…
Oxidation behavior of silicon nitride (Si 3 N 4 ) was investigated in flowing air (2.45 cm/s) containing 10%–50% H 2 O at a total pressure of 1.8–10 atm at 1300°–1500°C for 100 h. The oxidation of Si 3 N 4 progressed with volatilization of the SiO 2 scale; it was more enhanced at a high partial pressure of H 2 O rathe…
We investigate the pressure-induced structural transformation in liquid Al 2 O 3 by a molecular dynamics (MD) method. Simulations were done in the basic cube, under periodic boundary conditions, containing 3000 ions with Born–Mayer-type pair potentials. The structure of the liquid Al 2 O 3 model with a real density at…
We have measured the electrical resistivity, Hall effect, and magnetization of a $\mathrm{Nd}{\mathrm{B}}_{6}$ single crystal, in a temperature range from $2\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and in magnetic fields of up to $7\phantom{\rule{0.3em}{…
In this paper we map out the 1300°C isothermal section in the Ti–In–C ternary system. Two ternary compounds exist: Ti 2 InC α and Ti 3 InC δ . At 1300°C TiC x is in equilibrium with all phases, Ti 3 InC δ is in equilibrium with all the phases except C, and Ti 2 InC is in equilibrium with all phases except Ti and C. Th…
Electron field-emission properties of as-grown, etched, and regrown carbon nanotube thin films were investigated. The aligned carbon nanotube films were deposited by the microwave plasma-assisted chemical vapor deposition technique. The surface of the as-grown film contained a carbon nanotube mat of amorphous carbon a…
We show that the intercalating of alkali atoms with adequate concentration can transform a metallic single-walled carbon nanotube (SWCNT) into a semiconductor tube or a semiconductor SWCNT into a semiconductor tube with different band gaps due to a unique feature of the band structures in some SWCNTs as quasi-one-dime…
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In this work, the unique synthesis of mechanically milled silicon nanocrystals (Si nc) embedded in tetraethylorthosilicate (TEOS) thin films is reported. A series of Si nc, with sizes ranging from 10to25nm, have been synthesized using mechanical milling. For both the milled Si nc and milled Si nc embedded in TEOS thin…
Thermodynamic phase diagrams of alloys are usually computed or experimentally determined under the assumption of perfect crystallinity of the material. Here, we show that dislocations can change the phase stability of alloys and increase the size of the miscibility gap. This dislocation-induced destabilization of the…
The electronic structure of the Si(1 1 1):GaSe van der Waals-like surface termination has been determined by angle-resolved photoelectron spectro- scopy using photons in the energy range h ν = 12–170 eV supplied by the BESSY and ALS synchrotron light sources. The Si(1 1 1):GaSe surface is isoelectronic to the passivat…
Abstract A well‐regulated striped pattern was produced on a thin gold film with the following very simple procedure. Gold was deposited by ion sputtering onto an elastic silicone sheet that was prestretched. The obtained gold film was observed without the release of the stretching. A well‐regulated striped pattern spo…
Previous literature has shown that when a crack extends across a compressive layer within a two‐phase laminar ceramic, the crack can bifurcate under special conditions. These special conditions appeared to require that a second crack (known as an edge‐crack) had to preexist along the center line of the compressive lay…
Mullite–ZrO 2 composites have been fabricated by attrition milling a powder mixture of zircon, alumina, and aluminum metal with MgO or TiO 2 as sintering additives, heating at 1100°C to oxidize the aluminum metal, and consolidation by spark plasma sintering (SPS). The influence of the SPS temperature on the formation…
Gas feed composition and reaction temperature were varied to identify the thermodynamic threshold conditions for the nucleation and growth of SWNT from methane on supported Fe/Mo catalyst. These reaction conditions closely approximate the pseudoequilibrium conditions that lead to the nucleation and growth of SWNT. The…
The orientation distribution of sheared isotactic polypropylene (iPP) containing different amount of sodium benzoate (SB) has been investigated through the gradient of shear flow field using microbeam of synchrotron wide-angle x-ray techniques. The degree of the overall orientation of α-phase crystal is found to incre…
The influence of ball‐milling methods on microstructure and mechanical properties of silicon nitride (Si 3 N 4 ) ceramics produced by pressureless sintering for a sintering additive from MgO–Al 2 O 3 –SiO 2 system was investigated. For planetary high‐energy ball milling, the mechanical properties of Si 3 N 4 ceramics…
We present a detailed theoretical study of the magnetic ordering in heavy rare-earth compounds with a face-centered-cubic structure. In addition to the exchange interactions which are counted up to the third nearest neighbors, the effect of the dipolar interactions and magnetic anisotropic effect are also included in…
The oxygen partial pressure ( p O 2 )‐dependent structural behaviors of two dense tubular ceramic membranes in composition SrFe 0.2 Co 0.8 O x with cubic perovskite structure have been investigated by high‐temperature neutron powder diffraction: one in “static” mode and one in simulated‐operation mode in which one sid…
Magnetocaloric properties of perovskite-type manganese oxides with double Mn-O layers of composition La2−2xSr1+2xMn2O7 (x=0.33 and 0.4) have been investigated. A broad peak of magnetic entropy change (−ΔSM) was observed at the Curie temperature. The shape of −ΔSM is strongly dependent on the Sr concentration. In contr…