Materials Literature
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Lead- and bismuth-free Ba(Ti 1- x Zr x )O 3 (BTZ) thin films were fabricated on Pt(111)/Ti/SiO 2 /Si(100) substrates by the chemical solution deposition (CSD) process. The BaTiO 3 and BTZ005 thin films fabricated by the conventional process were observed to have a remarkable difference in grain size along the depth of…
Superlattice-structured Bi 4 Ti 3 O 12 -BaBi 4 Ti 4 O 15 (BiT-BBTi) ceramics and single crystals were prepared, and their crystal structure and polarization properties were compared with those of constituent BiT and BBTi. The Curie temperature ( T C ) of the BiT-BBTi crystals was 540°C, which was 40°C higher than that…
Metallic epitaxial LaTiO 3 /SrTiO 3 superlattice films were fabricated on SrTiO 3 (100) substrates. The superlattice structure maintained compressive epitaxial strain on LaTiO 3 and stabilized the perovskite LaTiO 3 crystal phase, which is not thermodynamically stable in thick films on SrTiO 3 . The superlattice films…
The ac performance of carbon nanotube field-effect transistors (CNFETs) has been characterized using two approaches involving: 1) time- and 2) frequency-domain measurements. A high input impedance measurement system was used to demonstrate time-domain switching of CNFETs at frequencies up to 100 kHz. The low level of…
Hydrothermal ZnO(0001) substrates with high crystalline quality were employed in the fabrication of polarity-controlled ZnO films using laser molecular beam epitaxy. The repolished Zn- and O-polar surfaces of ZnO substrates displayed atomically flat surfaces and high crystalline quality even after annealing at high te…
A Sn-nanorod-templated process was used for the first synthesis of single-crystalline wurtzite-type ZnS nanotubes. The as-grown ZnS nanotubes are structurally uniform single crystals and are partially filled with Sn (see picture). Most of the tubes are straight with lengths ranging from several to tens of micrometers,…
Abstract The aim of the study was to find and investigate some blends of polysaccharides, that could be used as binders and plasticizers in the basic conditions of aqueous alumina suspensions. Aqueous suspensions containing 45% (v/v) α‐alumina and maltodextrin combined with small quantities of other polysaccharides (t…
A reação de cura entre amostras de resina epoxídica (EP) e compostos à base de mercaptana (SH), amino-fenol e amina modificada foi estudada nas regiões espectrais do infravermelho médio (MIR) e próximo (NIR). Observou-se, basicamente, que a espectroscopia FT-NIR evidencia melhor as alterações espectrométricas ocorrida…
Self-assembled PbTiO 3 nanoislands were prepared on Pt(110)/SrTiO 3 (110) and Pt(100)/SrTiO 3 (100) by metalorganic chemical vapor deposition (MOCVD), and their microstructures were investigated. On Pt(110)/SrTiO 3 (110), the shapes of (101)-PbTiO 3 islands changed from square to rectangular ones elongated along the &…
Amorphous boron carbo–nitride films, BCxNy, (0.05⩽x⩽1.51,0.05⩽y⩽0.67), were deposited on SiO2 at 360°C and 1Torr using dimethylamine borane [NH(CH3)2:BH3] with ammonia and/or ethylene. The film composition could be controlled by varying the flow of ammonia and ethylene. X-ray photoelectron spectroscopy indicated a cha…
The influence of cross-linking reagent, glutaraldehyde, on the biostability of collagen films was examined. With greater cross-linking, water absorption ability, swelling degree and degradation rate were all decreased. Based on scanning electron microscopy observations, the collagen films changed from a compact struct…
Elementary analyses of a standard compression test and a new test configuration for combined compression and shear illuminate the mechanisms of deformation of dry fiber bundles in fiber preforms under multi-axial loads. Such stress states are central to fiber bundle behavior in thick preforms that are being manipulate…
Abstract We have recently investigated the structure and properties of biodegradable polymer based blends. The biodegradable polymers studied in our work include poly(3‐hydroxybutyrate) (PHB), poly(3‐hydroxybutyrate‐hydroxyvalerate) (PHBV), poly(butylene succinate) (PBSU), poly(ethylene succinate) (PES) and poly(ϵ‐cap…
Regularities of the formation of the relaxor and dipole-glass states in the systems of mixed ferroelectric-antiferroelectric crystals of the potassium dihydrogen phosphate family are discussed. The problems related to the crystal structure, lattice dynamics, and relaxation processes in dipole glasses and relaxors impl…
Abstract. The problem of similarity is one of explaining the causes of striking resemblances between patterns and architectural themes that recur in organisms at various scales of biological organization. Classical explanations that have considered only the alternatives of homology and analogy overlook similarities of…
Planar defects in the metastably retained h‐BaTiO 3 exhibiting α‐fringe pattern have been characterized via transmission electron microscopy (TEM). The eligible fault vectors were determined by adopting the invisibility criteria of 2πg·R = 0 or 2 n π augmented by high‐resolution imaging. Three stacking faults, F 1 , F…
This paper presents an experimental study of a tracking control of a shape memory alloy (SMA) wire actuator using a nonlinear robust compensator. The control design uses the sliding-mode approach and requires no detailed information about the SMA model. To test the effectiveness of the proposed controller, experiments…
Three-dimensional networks with periodicity of several nanometres consisting of platinum crystallites have been examined by a combination of transmission electron microscopy, electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. It has been clarified that the average three-d…
Lasing behavior has been studied in cholesteric liquid crystals (CLCs) doped with three oligothiophene (OT) derivatives such as α,α'-dimethylquaterthiophene (DMQtT) as laser dyes. CLCs spontaneously form a distributed feedback cavity, in which OT molecules are highly oriented parallel to the local director of CLCs wit…
The improvement of the piezoelectric properties of low-temperature-fabricated 0.375Pb(Mg 1/3 Nb 2/3 )O 3 -0.25PbZrO 3 -0.375PbTiO 3 (PMNZT) ceramics with a LiBiO 2 sintering aid was investigated by adopting a post-annealing process. The sinterability of PMNZT powders was markedly enhanced by liquid phase sintering wit…