Materials Literature
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Abstract In order to gain a greater insight in the nature of the D⇄Sb transannular interaction in dibenzostibocines, a series of D(C 6 H 4 S) 2 SbHal complexes (D = S; Hal = Cl 1 , Br 2 , I 3 ; D = O, Hal = Cl 4 ) has been synthesised. X‐ray structure determinations of complexes 1 − 4 reveal that the antimony atom is…
The structure of telechelic polymers is investigated using off-lattice Monte Carlo simulations and the polymer reference interaction site model (PRISM) integral equation theory. The polymer molecules are modeled as tangent-sphere freely-jointed chains where all beads interact via a hard sphere potential and end beads…
13 C and 2 H NMR relaxation time measurements were performed on four linear styrene−isoprene tetrablock copolymers (SISI) of overall molecular weight about 12 000 g/mol in order to characterize the segmental dynamics of both components. The two isoprene blocks are equal in length as are the two styrene blocks. A wide…
We report a new method for the nucleation and growth of diamonds by employing an electron-temperature control technique in CH 4 /H 2 radio frequency glow discharge plasma under a low gas pressure of 100 mTorr. The electron temperature in the plasma is controlled under constant gas pressure in a range from 0.5 to 2.5 e…
The physical processes accompanying an illumination of azobenzene chromophores embedded in a polymer matrix with spatially modulated and linearly polarized light are studied experimentally and simulated using the Monte Carlo (MC) method. The MC simulations base on a simple three-channel kinetic model of trans-cis type…
Abstract The rate of exchange of the two water molecules coordinated to a Gd III centre in neutral complexes with heptadentate DO3A derivatives is modulated by the basicity of the macrocyclic nitrogen bearing the pendant group: a lower basicity results in a slower water‐exchange rate. (© Wiley‐VCH Verlag GmbH & Co…
Using first-principles density functional calculations we showed that quantum structures can be generated on a single carbon nanotube by modulating the adsorption of hydrogen atoms. The band gap of the hydrogen-free zone of the tube widens in the adjacent hydrogen covered zone. The sudden variation of the band gap lea…
The thermoelectric power, electrical conductivity, crystal structure, and Raman active phonon modes of the semiconductor β-K2Bi8Se13 have been studied under pressure. There is a large increase in the electrical conductivity in the pressure range 0–1 GPa and a sharp maximum in the magnitude of the thermoelectric power…
The domain structure of epitaxial (001) Bi4Ti3O12 thin films grown on (001) SrTiO3 substrates by reactive molecular beam epitaxy was studied using transmission electron microscopy. It was found that the Bi4Ti3O12 thin films contain randomly distributed rotation domains of two different types, which are related by a 90…
We have studied, by small-angle magnetic neutron scattering, the evolution induced by the application of a magnetic field on the coexistence of ferromagnetism and antiferromagnetism in a crystal of ${\mathrm{Pr}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}.$ The results are compared to magnetic measurements, which pr…
Results of broadband dielectric studies in glass-forming liquid crystalline chiral isopentylcyanobiphenyl (5(*)CB) are presented. Tests conducted as a function of temperature and pressure revealed the coexistence of glassy and critical properties. The latter are associated with the isotropic-cholesteric phase transiti…
The on-site Coulomb energy ${(U}_{\mathrm{dd}})$ and crystal-field splitting $(10Dq)$ of doped Mott-insulator ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3}$ have been estimated using resonant soft-x-ray emission spectroscopy (SXES). The Raman scattering of the ${e}_{g}$- and ${t}_{2g}$-resonant…
Abstract Lanthanide complexes of 2,6‐dihydroxybenzoic acid (2,6‐Hdhb), namely [ n Bu 4 N] 2 [Ln(2,6‐dhb) 5 (H 2 O) 2 ] [Ln = Sm ( 1 ) and Tb ( 2 )], were synthesized and their crystal structures determined by single‐crystal X‐ray diffraction studies. The 2,6‐dhb − ligand coordinates to the lanthanide cations through t…
Electric-arc produced as-prepared single-walled carbon nanotube (AP-SWNT) films have been purified by a selective oxidation process. The purification is monitored by near-infrared (NIR) spectroscopy, which gives a quantitative estimate of relative purities. This technique also gives an estimate of the change in relati…
We present a theoretical study of a single bottle-brush molecule, which consists of multiarmed polymer stars grafted densely onto a stiff backbone. Mean-field approximation and a variational approach are used to calculate the dominant trajectories of the grafted chains, the shape of the molecule, and the segment densi…
Magnetic and magnetotransport properties of Mn2−xCuxSb (x=0, 0.1, 0.2, and 0.4) compounds have been studied. A phase transition from a ferrimagnetic to an antiferromagnetic state occurs in the Cu-substituted compounds as the temperature is reduced. A magnetic field-driven transition takes place in the Cu-containing co…
Magnetically soft/hard exchange-coupled Ni80Fe20/Si3N4/Sm40Fe60 and Ni80Fe20/mixture/Sm40Fe60 layered structures with induced in-plane uniaxial anisotropy were deposited by sputtering on Si (100) substrates. The interfacial exchange coupling strength between the soft and hard layers was tailored by inserting a thin no…
The antiferroelectric (AFE) Pb0.97La0.02(Zr0.60Sn0.30Ti0.10)O3 ceramic has a composition near the morphotropic phase boundary that separates the AFE from the ferroelectric (FE) phase. Its structural changes as well as macroscopic properties were investigated over a temperature range of −180–300 °C using transmission e…
Nanocrystalline carbon films possessing a prevailing diamond or graphite character, depending on substrate temperature, can be deposited from a methane hydrogen mixture by the direct current glow discharge plasma chemical vapor deposition method. While at a temperature of ∼880 °C, following the formation of a thin pre…
The effect of substituting La with Dy in the ferromagnetic perovskite ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ has been studied in the series $({\mathrm{La}}_{(1\ensuremath{-}x)}{\mathrm{Dy}}_{x}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ $(x=0,$ 0.114, 0.243, and 0.347). Magnetic and transport p…