Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Ti 3 Si C 2 ∕ Al 2 O 3 composites were prepared by hot-pressing sintering process. The dielectric permittivity and electromagnetic interference (EMI) shielding effectiveness (SE) is measured for the composites at the frequency range of 12.4–18GHz (Ku band). The experimental results show that the composites exhibit hig…
The dielectric response and anisotropic properties of natural rubber with embedded multiwall carbon nanotubes (CNTs) are studied in the 0.2–3THz frequency range using terahertz transmission spectroscopy. Natural rubber acts as an invisible and insulating medium in this frequency range, allowing examination of isolated…
The critical behavior of a multilayered system of alternating ferroelectric and ferromagnetic thin films on a substrate of finite thickness is studied. A thermodynamic approach via the Ginzburg–Landau formulation is followed. Our interest is in the magnetoelectric effects exhibited in the critical behavior of the mult…
Many microsystems fabrication technologies currently employ a metallic overlayer, such as gold, in electrical contact with silicon structural layers. During postprocessing in hydrofluoric-based acid solutions, a galvanic cell is created between the silicon and the metallic layer. Micromachined tensile specimens reveal…
The magnetic properties of the nanoparticles of hexacyanometallate based molecular magnetic compound Fe[Fe(CN)6]⋅xH2O have been investigated using dc magnetization and the frequency dependent real part of ac susceptibility χac′ techniques. The magnetic properties of these nanoparticles with an average particle diamete…
The low temperature dielectric and ferroelectric properties of SrTiO3, with constant averaged A-site ionic size but different A-site disorder degrees induced by A-site cation size mismatching through the codoping of Ca and Ba, are investigated. Upon the increasing A-site disorder degree, the dielectric property shows…
The structure, mechanical properties, and friction properties of hydrogenated graphitelike carbon film and typical hydrogenated diamondlike carbon film were investigated comparatively that the hydrogenated graphitelike carbon film has relatively high sp2 content and low bonded hydrogen content and possessed high hardn…
In practical use, ammonia (NH3) can be burned directly in internal combustion (IC), diesel or Stirling engines. However, because NH3 has such a low flame temperature and is hard to ignite, it has generally not been widely used in these applications. Because NH3 can be easily reformed into hydrogen (H2), and as part of…
The effect of vacuum annealing on local structure reconstruction, evolution of photoluminescence (PL) and paramagnetic defects in carbon-rich a-Si1−xCx:H films (x=0.7) was studied. Strong enhancement of visible (white-green) PL was observed after annealing in the temperature range of 400–500 °C. Such enhancement was c…
Optical and electronic properties of metal (Pb, Bi, Sn, and In) doped Zn4Sb3 are reported in the temperature range 80–300 K, which covers the β, α, and α′ structural phases of this thermoelectric material. Metal doping alters the subtle balance between Zn disorder and Zn deficiency present in β-Zn4Sb3 and changes its…
First principles density functional methods were used to investigate the atomistic behavior of hydrogen, helium, and oxygen in β-phase ErH2. The ground state for hydrogen was indeed determined to be the tetrahedral position as commonly assumed, but if the surrounding tetrahedral sites are filled, any additional hydrog…
Optical detection of magnetic resonance (ODMR) and electron paramagnetic resonance (EPR) spectra are investigated in ZnO single crystals. The strong negative ODMR line with axial symmetry of the g-tensor around the c axis with g∥=2.0133±0.0001 and g⊥=2.0135±0.0001 is ascribed to Pb3+ ions. The strongest Pb3+ ODMR spec…
Four CoFe2O4/Pb(Zr0.52Ti0.48)O3 (CFO/PZT) bilayered thin films with increasing PZT constituent layer thicknesses have been fabricated in order to investigate the optimized PZT layer thickness and the thickness effect on the magnetic and ferroelectric behaviors of the heterolayered multiferroic thin films. These hetero…
Advanced aeronautic and space structures need active components that can function at high frequencies and temperatures. Piezoelectric materials can provide frequency response but their use at elevated temperatures is limited. The reason for the lack of insertion of piezoelectric for high temperature active component a…
Miniaturization of electronics to the nanoscale brings new challenges. Because of their small size and immense information and power processing capacity, large temperature gradients exist across nanoelectronics and power electronics solder joints. In this paper, a fully coupled thermomechanical-diffusion model is intr…
The transition temperature from monoclinic to orthorhombic and the thermal expansion of the orthorhombic phase were investigated for three systems of the family A{sub 2}M{sub 3}O{sub 12}: Cr{sub 2x}Fe{sub 2-2x}Mo{sub 3}O{sub 12}, Al{sub 2x}Fe{sub 2-2x}Mo{sub 3}O{sub 12} and Al{sub 2x}Cr{sub 2-2x}Mo{sub 3}O{sub 12}. It…
Three halotolerant bacterial strains; Rhodobacter sphaeroides ES16 (the wild type) and the two mutant strains of R. sphaeroides ES16, namely N20 and U7, were cultivated in glutamate-malate (GM) medium and screened for production of polyhydroxybutyrate (PHB). The mutant strains N20 and U7 were found to accumulate PHB (…
While it is widely known that nanowires show strong size dependence on their elastic modulus and yield strength, the study on the asymmetric tensile and compressive yield strengths is scarce. In particular, the effect of the surface stress needs to be clearly revealed. In this paper, a theoretical framework is propose…
Magnetoelectric (ME) laminate composite consisting of optimal crystal cut thickness-polarized piezoelectric 0.7Pb(Mg1∕3Nb2∕3)O3–0.3PbTiO3 (PMN-PT) single crystal and the length-magnetized magnetostrictive Tb0.3Dy0.7Fe1.92 (Terfenol-D) alloy has been fabricated. The cut optimization of PMN-PT crystal greatly enhances t…
In order to improve the upconversion (UC) luminescence of lanthanide-doped nanoparticles (NPs), different sized Y2O3:Tm3+, Yb3+ NPs were synthesized using the Pechini type sol-gel method, and their surfaces were coated with different thickness of SiO2 or TiO2 shells using the Stöber method. The results indicate that l…