Materials Literature
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The world of organic luminophores has been confined for a long time to fairly standard biological labeling applications and to certain analytical tests. Recently, however, the field has undergone a major change of direction, driven by the dual needs to develop novel organic electronic materials and to fuel the rapidly…
The magnetic phase diagram of single-crystalline Ho 1− x Er x MnO 3 below T N (antiferromagnetic transition temperature) is determined by measuring the magnetic susceptibility (χ), specific heat ( C P ), and dielectric constant (ε). Er doping enhances the P 6 3 c m magnetic phase above T SR (spin-reorientation tempera…
The electrical conduction of Li 2 O–B 2 O 3 , Na 2 O–B 2 O 3 and K 2 O–B 2 O 3 glasses seems, at first sight, to be dominated by the activation energy. Regardless of the size of the alkali ion, there is a unique dependence of conductivity, at a certain temperature, on the alkali–alkali distance and thus on N (the numb…
Thermal expansions (TEs) of dense and porous samples were studied for mixed conductor Sr(Co 0.9 Nb 0.1 )O 3−δ (SCNb). In Ar, the TEs of the porous samples were almost the same as those of a dense sample, which had the character of conventional TEs. In air, on the other hand, the TEs of porous samples were larger than…
Lithium manganese oxide thin films have been grown using a gas jet based, electron beam directed vapor deposition technique. The deposition rate could be controlled by the electron beam power as well as the gas jet density and speed. This enabled films to be grown at deposition rates up to 16nm∕s which is a significan…
Abstract Vertically aligned double‐walled carbon nanotubes (DWCNTs) with the highest selectivity of 90% were synthesized by a controlled heating method and their electric double‐layer capacitor characteristics were evaluated. DWCNT arrays had a specific capacitance of 83 F/g, which is one of the highest values among C…
We report the experimental evidence of significant change of the valence band structure during crystallization of Ge2Sb2Te5 (GST). Amorphous GST, prepared by sputter deposition at room temperature (RT), transforms successively into face-centered-cubic (fcc) and a hexagonal-close-packed (hcp) structures at around 150 a…
X‐ray photoelectron spectroscopy was performed to elucidate the catalytic activity of CH 4 oxidation on perovskite‐type Ca(Mn 1− x Ti x )O 3−δ synthesized at 1173 K in a flow of oxygen from a gel with citric acid and ethylene glycol. The Mn ion content decreases and the ratio of the Mn 3+ ion in the Mn ion increases w…
We describe a strategy for fabricating devices on perforated silicon nitride membranes that is ideal for systems with modulated structure, in particular for nanotubes with endohedral inorganic compounds or molecules, or nanotubes externally functionalized with soft materials. It uses dynamic nanostenciling and focusse…
We report the results of a spectroscopic study of a single layer of metallic single closed ring resonators on freestanding thin membrane at near normal and grazing angles of incidence. When the magnetic component of the light is perpendicular to the ring plane, we observe a negative index of refraction down to −1 arou…
The influence of supports on the preparation of TiO 2 nanoparticles by the adsorption phase technique is studied in detailed. Series temperature experiments of two types of supports (named as SiO 2 A and B) were used. Energy‐dispersive analysis by X‐ray indicates that the concentration of TiO 2 on both supports decrea…
Microstructural features of La2∕3Ca1∕3MnO3 layers of various thicknesses grown on top of (001) LaAlO3 substrates are studied by using transmission electron microscopy and electron energy loss spectroscopy. Films are of high microstructural quality but exhibit some structural relaxation and mosaicity both when increasi…
Composite NiO–CGO (Ce 0.9 Gd 0.1 O 1.95 ) films were deposited on CGO substrates using the electrostatic‐assisted ultrasonic spray pyrolysis (EAUSP) method. Deposition parameters were varied systematically to investigate their effects on film microstructure and electrochemical performance. The X‐ray diffraction patter…
This paper describes a straightforward and rapid on-line characterization using high-performance liquid chromatography/electrospray ionization tandem mass spectrometry (HPLC/ESI-MS(n)) of the enzymatic degradation products of 2,2'-bis(2-oxazoline)-linked poly-epsilon-caprolactone (PCL-O). These new PCL-O polymers are…
Thin films of VO 2 doped with aluminium, or with nanoscale grain sizes, have been produced. They display semiconductor resistive behaviour above the transition temperature T c , but a metallic and plasmonic optical response. All samples optically switch over almost identical large ranges at the transition, but have qu…
Using combined neutron spectroscopy and first-principles calculations, we investigated the electronic structure and vibrational dynamics of the recently discovered class of ternary hydrides ${\mathrm{Li}}_{4}{\mathit{Tt}}_{2}\mathrm{H}$ ($\mathit{Tt}=\mathrm{Si}$ and Ge). In these compounds, all hydrogen atoms are loc…
Ba 0.6 Sr 0.4 Ti O 3 (BST) thin films buffered with Pb0.3Sr0.7TiO3 (PST) at each side of the interface contact with electrodes (PST/BST/PST) were deposited on Pt∕Ti∕SiO2∕Si substrates. The dielectric properties of the films were measured using planar Pt∕PST∕BST∕PST∕Pt∕Ti∕SiO2∕Si capacitor structures. The existence of…
Hard piezoelectrics based on PZT with a composition near the morphotropic phase boundary (Pb 0.94 Sr 0.06 )(Zr 0.53 Ti 0.47 )O 3 [PSZT] have been synthesized by the sol–gel method. The influence of B site aliovalent dopant Mn 3+ on the crystal structure and electrical properties has been investigated. Mn 3+ ions ( d 4…
Four new representatives of the natrochalcite structure type s.s . – A + Me 2 2+ ( X 6+ O 4 ) 2 [(H 2 O)(OH)], monoclinic, space group C 2/ m , Z = 2 – with Me 2+ = Co or Ni were synthesised under low-hydrothermal conditions and their crystal structures were refined from single-crystal X-ray diffraction data up to sin…
Monodisperse porous SrTiO 3 spheres with an average size of ca. 200 nm were synthesized via a hydrothermal route in the presence of poly vinyl alcohol (PVA). Characterization techniques such as X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, SAED, and high‐resolution transmission ele…