Materials Literature
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Photovoltaic responses, including photovoltage, photocurrent, illuminated J-V curve, and light-to-electricity power conversion efficiency, were investigated in chemical-solution-derived polycrystalline and epitaxial (Pb0.97La0.03)(Zr0.52Ti0.48)O3 (PLZT) thin films sandwiched between different metal and oxide electrode…
In a magnetostrictive-piezoelectric bilayer the interaction between the magnetic and electric subsystems occurs through mechanical deformation. A model is discussed here for the resonance enhancement of such magnetoelectric (ME) interactions at frequencies corresponding to bending oscillations. The thickness dependenc…
Photoluminescence (PL) measurements were used to study the effect of postdeposition treatments by annealing and CdCl2 activation on polycrystalline CdS layer grown by close-spaced sublimation (CSS) and chemical bath deposition (CBD). CdS films were either annealed in a temperature range of 200–600 °C or CdCl2 treated…
We report the magnetotransport properties of self-assembled Co@CoO nanoparticle arrays at temperatures below 100 K. Resistance shows thermally activated behavior that can be fitted by the general expression of R∝ exp{(T0/T)ν}. Efros–Shklovskii variable range hopping (ν=1/2) and simple activation (hard gap, ν=1) domina…
In the present work, nonlocal elasticity theory has been implemented to study the vibration response of single-layered graphene (SLGS) sheets. The nonlocal elasticity theory accounts for the small size effects when dealing with nanostructures. Influence of the surrounding elastic medium on the fundamental frequencies…
The complex permittivity of conducting polyaniline and zeolite-polyaniline blends was measured in the frequency range of 10−2–2×106 Hz from room temperature to liquid nitrogen temperature. A loss peak is detected for 25, 35, and 50 wt % zeolite blends. Its position in the frequency domain, activation energy, and inten…
The influence of the deposition pressure (PO2) and substrate temperature (TS) during the growth of Bi2FeCrO6 thin films grown by pulsed laser deposition has been investigated. It is found that the high volatility of Bi makes the deposition very difficult and that the growth of pure Bi2FeCrO6 thin films on SrTiO3 subst…
Radial elastic corrugation of multiwalled carbon nanotubes under hydrostatic pressure is demonstrated by using the continuum elastic theory. Various corrugation patterns are observed under a pressure of several GPa, wherein the stable cross-sectional shape depends on the innermost tube diameter D and the total number…
We have performed charge transfer phase formation studies on the donor/acceptor system bis(ethylendithio)tetrathiafulvalene,(BEDT-TTF)/tetracyanoquinodimethane,(TCNQ) by means of physical vapor deposition. We prepared donor/acceptor bilayer structures on glass and Si(100)/SiO_2 substrates held at room temperature and…
The crystal structures of six industrially produced benzimidazolone pigments [Pigment Orange 36 (beta phase), Pigment Orange 62, Pigment Yellow 151, Pigment Yellow 154 (alpha phase), Pigment Yellow 181 (beta phase) and Pigment Yellow 194] were determined from laboratory X-ray powder diffraction data by means of real-s…
A high dispersion of Co 3 O 4 and Mn 3 O 4 nanoparticles on SBA-15 mesoporous silica was carried out thanks to a two-solvent impregnation method. This kind of preparation allows a proper control of both the metal oxides loading (7 or 30 wt.%) and the particle sizes (10–12 nm). A complete set of physico-chemical charac…
Abstract Periodic DFT calculation supports quantitatively the energy of ammonia adsorption on zeolite Brønsted acid sites, which was measured by ammonia IRMS–TPD experiment as an index of the acid strength.
The crystal structure of the nanocrystalline alpha phase of Pigment Yellow 213 (P.Y. 213) was solved by a combination of single-crystal electron diffraction and X-ray powder diffraction, despite the poor crystallinity of the material. The molecules form an efficient dense packing, which explains the observed insolubil…
The precipitation in as aged duplex stainless steel 2101 with composition Fe–21Cr–5·7Mn–1·2Ni–0·23N–0·3Mo was investigated. The precipitates were detected by XRD and TEM and confirmed to be mainly Cr 2 N, together with some Cr 23 C 6 particles. The precipitation was observed at 650–900°C. TEM analysis showed that plat…
Single crystals and microcrystalline samples of the calcium tellurate(IV) phases alpha-, beta-, beta'- and gamma-CaTeO3 as well as of two solid solutions Ca(x)Sr(1-x)TeO3 (x = 0.55 and 0.77) have been synthesized and characterized by X-ray diffraction and thermal analysis. A comparative description of the structures a…
The crystal structures of two industrially produced laked yellow pigments, Pigment Yellow 183 [P.Y. 183, Ca(C16H10Cl2N4O7S2), alpha phase] and Pigment Yellow 191 [P.Y. 191, Ca(C17H13ClN4O7S2), alpha and beta phases], were determined from laboratory X-ray powder diffraction data. The coordinates of the molecular fragme…
The structural evolution of selected perovskites containing Jahn–Teller cations has been investigated in the light of a formal analysis of symmetry hierarchies for phase transitions driven by octahedral tilting and Jahn–Teller cooperative distortions. General expressions derived from the strain/order-parameter couplin…
This review paper summarizes recent advances in self-assembly of complex polymers, focusing on three characteristic polymeric systems. The first is star-branched polymers of the ABC type, the second one consists of multiblock terpolymers with different chain lengths, while the third comprises supramacromolecular assem…
The structure of jute fibre has been modified using caustic soda up to a limit in order to improve its performance. The SEM micrographs of untreated jute fibres show a smooth surface, while alkalised jute fibres show rough and void regions between individual fibre cells. The study showed that the tensile strength and…
Space groups, order-parameter and strain/order-parameter coupling relationships in ABX3 perovskite structures which combine cooperative Jahn-Teller distortions and octahedral tilting have been investigated from the perspective of group theory using the computer program ISOTROPY. Two common Jahn-Teller ordering schemes…