Materials Literature
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Low temperature resistivity of CMR manganites is investigated. At the ground state, conduction electrons are perfectly spin polarized, which is called half-metallic. From one-magnon scattering processes, it is discussed that the resistivity of a half metal as a function of temperature scales as rho(T) - rho(0) propto…
An experimental proof-of-principle of an enhanced Z3DT (thermoelectric figure of merit) is demonstrated using (001) oriented Si/Ge superlattices. The highest value of the experimental Z3DT at 300 K for a (001) oriented Si(20 Å)/Ge(20 Å) superlattice is 0.1 using κ=5 Wm−1 K−1, for the in-plane thermal conductivity, whi…
The internal thermalization dynamics of the conduction electrons is investigated in silver nanoparticles with radius ranging from 13 to 1.6 nm using a femtosecond IR pump-UV probe absorption saturation technique. A sharp increase of the electron energy exchange rate is demonstrated for nanoparticles smaller than 5 nm.…
In an attempt to reproduce the functional properties associated with relaxor electroceramics, pulsed laser deposition has been used to fabricate thin-film capacitor structures in which the dielectric layer is composed of a superlattice of Ba0.8Sr0.2TiO3 and Ba0.2Sr0.8TiO3. The properties of the capacitors were investi…
The adsorption behavior of positively charged poly(propylene imine) dendrimers on glass has been studied by scanning angle reflectometry as a function of generation, pH, and ionic strength. The results indicate that the adsorption is controlled by properties of both the dendrimers (size and charge) and the surface lay…
Lamellar organoammonium silicates with variable silicon environments have been synthesized by the reaction of a layered polysilicate kanemite with aqueous solutions of hexadecyltrimethylammonium (C 16 TMA) chloride. While the structure of kanemite is composed of only Q 3 silicate species ((SiO) 3 Si O), SiO 4 units wi…
We have prepared a linear array of chromophores consisting of a perylene input unit, a bis(free base porphyrin) transmission unit, and a free base phthalocyanine output unit for studies in artificial photosynthesis and molecular photonics. The synthesis involved four stages: (1) a rational synthesis of trans-AB2C-porp…
Effective pair potentials for hollow nanoparticles like the ones made from carbon (fullerenes) or metal dichalcogenides (inorganic fullerenes) consist of a hard core repulsion and a deep, but short-ranged, van der Waals attraction. We investigate them for single- and multi-walled nanoparticles and show that in both ca…
We study thermal relaxation in ordered arrays of coupled nonlinear elements with external driving. We find, that our model exhibits dynamic self-organization manifested in a universal stretched-exponential form of relaxation. We identify two types of self-organization, cooperative and anti-cooperative, which lead to f…
A study has been made of the electrical resistivity ρ, magnetoresistance Δρ/ρ, and magnetization of La 0.35 Nd 0.35 Sr 0.3 MnO 3 epitaxial films on ZrO 2 (Y 2 O 3 ), SrTiO 3 , LaAlO 3 , and MgO substrates. The first film can exist in four equivalent crystallographic orientations in the sample plane, while the other th…
New crystals of the composition Er 2 (SO 4 ) 3 ⋅ 8H 2 O have been synthesized by the method similar to that used for synthesis of (CH 3 ) 2 NH 2 Al(SO 4 ) 2 ⋅ 6H 2 O. The synthesized crystals were studied by the X-ray diffraction method. The crystals are monoclinic C 2/ c ) and contain no (CH 3 ) 2 NH 2 ions. It is es…
A new detection system in scanning electron microscope, which filters in energy and detects the backscattered electrons close to the microscope axis, is described. This technique ameliorates the dependence of the backscattering coefficient on atomic number, and suppresses effectively the relief contrast at the same ti…
A new approach for the measurement of noise resistance based on the transient behavior of pitting corrosion is presented. Potential noise and current transients have been recognized as a characteristic behavior of pitting corrosion. This new approach uses the transient information present during corrosion as a way to…
The title compound doped with a small amount of deuterium shows infrared bands due to the N−D and O−D stretching vibrations. When one of the N−D bands is irradiated with an infrared laser, holes and anti-holes are produced. The pattern of these holes/anti-holes depends on the irradiation time. A ten-minute irradiation…
We report the measurements of pulse polarizations of (Pb, La)(Zr, Ti)O3 ferroelectric capacitors as a function of pulse width. Pulse polarizations were measured from the switching current responses in the pulse width range from 1 μs to 1 s. The relation between pulse polarizations(switched(P∗) and non-switched polariz…
This article presents a state-of-the art review to provide a detailed and coordinated account of the development of textures in titanium and its alloys during thermomechanical processing. In general, the evolution of textures depends on several factors such as deformation temperature and mode of deformation, initial t…
The aim of this study is the analysis of the dynamic crack propagation criteria in materials under impact loading. We want to define which mechanical quantities monitor the propagation, then use these parameters in numerical simulations and finally compare the results with dynamic propagation experiments. First, we pr…
Polypyrrole coatings were successfully electrodeposited on low-carbon steel substrates from aqueous oxalate solutions. The surface composition and topography of the polypyrrole coatings formed under different conditions were investigated by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The…
Abstract Seit mehr als 50 Jahren werden Leuchtstoffe in Kathodenstrahlröhren zur Erzeugung von sichtbarem Licht eingesetzt. In den letzten Jahrzehnten sind die verwendeten Materialien ständig verbessert worden, um die gestiegenen Ansprüche an Auflösung, Helligkeit und Kontrast von Monitoren und Fernsehern zu erfüllen.…
The influence of thermo-exfoliated graphite (TEG) on the catalytic activity of nickel in the CO oxidation process has been investigated. It was shown that nickel supported on the thermo-exfoliated graphite surface was more active catalytically than the bulk metal. Alternate oxidation–reduction on the Ni–NiO phase boun…