Materials Literature
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Recently theoretical works predict that some semiconductors (e.g. ZnO) doped with magnetic ions are diluted magnetic semiconductors (DMS). In DMS magnetic ions substitute cation sites of the host semiconductor and are coupled by free carriers resulting in ferromagnetism. One of the main obstacles in creating DMS mater…
Carbon nanotube (CNT) field emitters are now being evaluated for a wide range of vacuum electronic applications. However, problems including short lifetime at high current density, instability under high voltage, poor emission uniformity, and pixel-to-pixel inconsistency are still major obstacles for device applicatio…
The perovskite‐like layer‐structured (PLS) Nd 2 Ti 2 O 7 and La 2 Ti 2 O 7 have possibly the highest Curie points of any materials. To pole these ceramics, highly textured, dense ceramics with high DC electrical resistivity are required. The ferroelectric and piezoelectric properties of lead‐free Nd 2 Ti 2 O 7 and La…
We have investigated structural phase transitions across a ferroelectric-to-antiferroelectric phase boundary in epitaxial (001) oriented ${\text{Bi}}_{(1\ensuremath{-}\text{x})}{\text{Sm}}_{\text{x}}{\text{FeO}}_{3}$ thin films. For the ${\text{Sm}}^{3+}$ concentration of $0.1\ensuremath{\le}x\ensuremath{\le}0.14$, we…
The magnetic and electronic properties of MoS(2) nanoribbons with zigzag and armchair edges are investigated using LSDA-DFT. We found that the properties of the nanoribbons are very different from bulk MoS(2) due to edge states. Armchair nanoribbons could be metallic and exhibit a magnetic moment; however, when passiv…
The semiconductors Li(2)CdGeS(4) and Li(2)CdSnS(4), which are of interest for their nonlinear optical properties, were synthesized using high-temperature solid-state and polychalcogenide flux syntheses. Both compounds were found to crystallize in Pmn2(1), with R1 (for all data) = 1.93% and 1.86% for Li(2)CdGeS(4) and…
The nanoporous metal-organic framework [Fe(pz)Ni(CN)(4)], 1 (where pz is pyrazine), exhibits hysteretic spin-crossover at ambient conditions and is robust to the adsorption and desorption of a wide range of small molecular guests, both gases (N(2), O(2), CO(2)) and vapors (methanol, ethanol, acetone, acetonitrile, and…
MgO wird diskret: Monodisperse MgO-Nanokristalle können durch direkte Kolloidalsynthese hergestellt werden (siehe Bild). Der Durchmesser lässt sich durch Zusatz kleiner Wassermengen zum organischen Reaktionsmedium zwischen 2 und 8 nm einstellen. Obwohl Trioctylphosphanoxid bei der Reaktion anwesend ist, sind die gebil…
The physical parameters of Olumo rocks namely, radiogenic heat, age of the rock, density and average absorbed dose rate were determined.The radioactive concentrations were also determined using gamma-ray spectrometry. The three natural radio nuclides examined in the rock samples were namely 40K, 238U and 232Th. The av…
Temperature and frequency dependent AC conductivity behavior has been studied for the chemically synthesized polyaniline-polymannuronate (PANI-PM) composites. The temperature (300 - 500 K) and frequency (100 - <TEX>$10^6$</TEX> Hz) dependent AC conductivity suggests evidence for the transport mechanism in PANI-PM comp…
The mechanisms of the photochemical isomerization reactions were investigated using two model systems of indoxazene (1) and isoazole-3-carboxylate (5) with the CASSCF and MP2-CAS methods using the 6-311G(d,p) basis set. The active space of the former consists of 14 electrons in 11 orbitals, while that of the latter co…
The recently synthesized heterotrimetallic complex [Co(2)PdCl(2)(dpa)(4)] shows an unusual temperature-independent paramagnetism (TIP), extending over the whole experimental temperature range (0-300 K; Rohmer et al. Angew. Chem., Int. Ed. 2007, 46, 3533). We explain this behavior from a microscopic approach, using lig…
O, (ox = oxalate; en = ethylenediamine) has been hydro-thermally synthesized and characterized by single crystal X-ray diffraction, IR spectrum, TG analysis, and magnetic measurements. In the structure the Ni atoms are coordinated with four oxygen atoms in two oxalate ions and two nitrogen atoms in one ethylenediamine…
This paper describes the synthesis and characterisation of methacrylic liquid crystalline side chain polymer containing azo group, with (PM6OAn) and without (PM6An) hydroxyl group. The characterisation was done by using a polarised light microscope (PLM), differential thermal analysis (DTA), and X-ray diffractometry.…
We use a charge-dipole interaction model to study the polarizability of aromatic molecules that are placed between two silver clusters. In particular we examine the enhancement in polarizability induced by the clusters at plasmon-like resonant frequencies of the cluster-molecule-cluster system. The model used for thes…
In this study, a novel series of chiral dopants were synthesised via the esterification reaction between optically active (S)-1,2-propanediol and mesogenic carboxylic acids. The phenomenon of a helix inversion with temperature variation could be observed in the chiral nematic liquid crystals (N*-LCs) by doping the chi…
The Size of Drops T he relation between the diameter of a tube and the weight of the drop which it delivers appears to have been first investigated by Tate, whose experiments led him to the conclusion that “other things being the same, the weight of a drop of liquid is proportional to the diameter of the tube in which…
The anomalous Hall effect (AHE) in quarternary Heusler-type Ni50Mn17Fe8Ga25 melt-spun ribbons is investigated. Experimental correlation between saturated anomalous Hall resistivity (ρAMS) and longitudinal resistivity (ρxx) is achieved for the low-temperature martensitic phase and the high-temperature austenitic phase…
Reactions of cationic and anionic platinum clusters Pt(n)(+/-), n=1-5, with NH(3) are studied by FT-ICR mass spectrometry and DFT calculations. With cationic clusters, radiative association of an intact NH(3) is the dominant reaction channel. On anionic clusters, NH(3) undergoes reductive elimination of molecular hydr…
Using classical density functional theory (DFT), we investigate the phase behavior of binary mixtures, in which the interactions between all particles are described by ultrasoft, repulsive potentials. In the pure case, one of the species, species 2, forms clusters, and freezes into a cluster crystal at sufficiently hi…