Materials Literature
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Abstract For the first time electric‐field‐induced atomic displacements (internal strains) in non‐ferroelectric polar BiB 3 O 6 single crystal plates (point symmetry 2) were investigated using X‐ray diffraction technique. The intensity variations of selected Bragg reflections were collected for three different orienta…
The crystal structures of the perovskites La1/3NbO3 and La1/3TaO3 were studied between 10 and 350 K using high-resolution neutron powder diffraction and compared with their radio-frequency dielectric response over the same temperature range. The structure of La1/3NbO3 remains orthorhombic Cmmm, while La1/3TaO3 undergo…
Abstract In this paper, all eight tensor components of the nonlinear optical susceptibility tensor for second harmonic generation were determined for monoclinic non‐centrosymmetric lithium sulfate monohydrate, Li 2 SO 4 ·H 2 O, using the Maker fringe technique at the wavelength λ=1064 nm. The largest component of the…
Abstract Poly(1,3‐butylene adipate) (PBA) as the plasticizer for poly(lactic acid) (PLA) and carbon black (CB) as conductive filler, electrically conductive polymer composites (CPC) with different CB and PBA contents were prepared. Fourier transform infrared revealed that the interaction existed between PLA/PBA matrix…
We report a formation method and an electrical characterization of aligned arrays of Au nanoparticles (∼20–40 nm). We synthesized the structure by immersing a substrate vertically into a solvent with nanoparticle and letting the solvent evaporate. The periodicity of the arrays has been controlled in 10–40 μm range by…
Abstract Lithium niobate crystals doped with ytterbium were studied using Electron Paramagnetic Resonance (EPR) and Electron Nuclear Double Resonance (ENDOR). The tremendous narrowing of EPR lines in nearly stoichiometric samples, when compared to those in congruent samples, allowed us to distinguish nine non‐equivale…
A new sonogenerated chemiluminescence (SCL) system has been developed to investigate the SCL behavior of acidinium ester (AE). The optimum parameters for this SCL system have also been investigated in detail. Under the optimum conditions, a typical SCL signal could be obtained in a mixture of DMF and alkaline water so…
Abstract Mechanical properties and adhesion phenomena of isotactic polypropylene/wollastonite/metallocene propylene‐ethylene copolymers (iPP/W/EPR) composites were studied as a function of metallocene propylene‐based copolymers content from 0 to 20 vol%. The composites with different surface treated wollastonites and…
At elevated temperatures the crystals of complex acid salts K m H n (SO 4 )(m + n)/2 . xH 2 O (0 ≤ x ≤ 1, m > 3, n ≥ 1) exhibit an anomalous temperature behavior of the dielectric permittivity and conductivity similar to the behavior observed in pure KHSO 4 at the structural phase transition or on melting. This unusua…
The roles of coordinating ligands (TOPO, OA, HDA, and TDPA) for the synthesis of ZnO nanoparticles are investigated. Various shapes (hexagonal cone, hexagonal plate, and rod) and sizes (5-100 nm) of ZnO nanoparticles are prepared in relation to the coordinating ligands. The hexagonal shapes (<TEX>$\leq$</TEX> 100 nm)…
Using the field-emission (FE)-induced evaporation technique, carbon-nanotube (CNT) caps with continuously varying radii from subnanometer to 2.5 nm are obtained on individual CNTs with a conical tip. It is found that 1 nm may be considered as a practical critical radius for the applicability of the Fowler–Nordheim the…
Abstract Penetration and perforation behavior of glass fiber reinforced plastic (GFRP) plates containing 20% sand filler have been investigated via high velocity impact tests using sharp tipped (30°) projectile and quasi‐static perforation tests. Two size sand filler (75 and 600 μm) were used in 4‐, 8‐, and 14‐layered…
Abstract TbB 3 O 6 , that suffers peritectic decomposition below its melting point, was obtained as single crystals by growth from borate flux. Depending on the borate flux, orthorhombic (space group Pnma ) TbB 3 O 6 belonging to the isomorphic series of rare earth triborates with small lanthanides, or monoclinic (spa…
The influence of glass-fiber (GF)/polypropylene (PP) commingled yarn structure on the impregnation quality of laminates is investigated by characterizing the microstructure and mechanical properties of the laminates. For this study, the degree of interlacing of the commingled yarns is taken as a measure of the structu…
We have developed tough nanofiber hydrogels incorporating ferritin nanoparticles with a core-shell structure that is suitable for stress concentration reduction. The swelling properties of the nanocomposite hydrogel under external forces were enhanced, leading to fast water absorption. The elastic modulus, tensile str…
Epitaxial thin films of hexagonal ErMnO3 fabricated on Pt(111)/Al2O3(0001) and yttria-stabilized zirconia(111) substrates exhibited both ferroelectric character and magnetic ordering at low temperatures. As the temperature was reduced, the ErMnO3 films first showed antiferromagnetism. At lower temperatures, the films…
Abstract A central target of theoretical studies on thermoelectric (TE) functionally graded materials (FGM) is to elaborate recipes for optimum design of TE elements, i.e. to identify optimum spatial profiles of the functional material parameters Seebeck coefficient S , electrical conductivity σ , and thermal conducti…
Abstract We have observed edge emission due to free excitons and electron–hole droplets in diamond by two‐photon excitation using subpicosecond laser pulses at 257 nm. We find that excitonic temperatures under two‐photon excitation are much lower than the case of one‐photon excitation. A minimum excitonic temperature…
Abstract We demonstrate that the optical reflectivity for s‐polarized light vanishes at a certain angle in a stratified metal–dielectric metamaterial numerically and experimentally. The metamaterial consists of a unit cell where a Ag layer of 30 nm thickness is sandwiched by Al 2 O 3 layers of 60 nm thickness. In orde…
Abstract Shape memory fibers (SMFs) were prepared via a melt spinning process. The fibers were subject to different heat treatments to eliminate internal stress and structure deficiency caused during the melt spinning process. The influences of heat treatments on the SMF thermal properties, molecular orientation, tens…