Materials Literature
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The structures of deuterated, protonated, and relithiated forms of MnO 2 spinel, obtained by ion exchange of Li ions with D or H in a well-crystallized spinel Li 1.27 Mn 1.73 O 4 compound, have been determined by powder neutron diffraction. Refinements were carried out using the Rietveld method of powder profile analy…
The microstructures of melt spun Sm11Fe89 and (Sm11Fe89)94Ti3C3 have been investigated under different solidification conditions. The magnetic properties of the nitrided materials have been related to the observed microstructures. Melt spinning of the Sm11Fe89 alloys resulted in grain sizes at or above the single doma…
In order to address the problem of the optical reflectance of cermets beyond the quasistatic dipolar limit, we consider Monte Carlo multiple scattering simulations as well as a radiative transfer study. Slabs of alumina with inclusions of Cu, Au, Co and Cr are studied; reflectance coefficients are calculated as a func…
Poly(ethylene) (PE) samples were immersed in aqueous solutions of different anionic surfactants, viz. sodium dodecane sulfate (SDS), sodium 10-undecene sulfate (S11(:)), and sodium 10-undecenoate (C11(:)). When the PE samples were removed from the solutions, dried, and analyzed with X-ray photoelectron spectroscopy (X…
Nuclear resonance fluorescence excited with continuous electron bremsstrahlung from the 4.3 MV Stuttgart Dynamitron accelerator is used as a nondestructive method to determine the C13 content x of bulk isotopic diamonds (12C1−x13Cx). The smallest detectable amount of C13 in carbon or low Z matrices is on the order of…
The synthesis and crystal structure of diaquacobalt tetracyanonickelate tetrahydrate are reported. The structure of Co(H2O)2Ni(CN)4.4H2O is made up of alternating metal cyanide sheets and layers of hydrogen-bonded water molecules. The title compound is isostructural with Cd(H2O)2Ni(CN)4·4H2O.
We prove that the upper electronic bands of κ-phase BEDT-TTF salts are adequately modeled by a tight-binding lattice with one site per cell. The band parameters are derived from recent ab initio calculations, getting a very simple but extremely accurate one-electron picture. This picture allows us to solve the BCS gap…
Hard amorphous carbon (ta-C) films were implanted with 20 keV N+ ions with different fluences up to 6×1017/cm2 at different substrate temperatures. The nitrogen content of the films was monitored in situ using elastic recoil detection analysis. A characteristic temperature dependence is observed for the maximum achiev…
In this paper we apply some theoretical predictions that arise in the mean-field framework for a large class of infinite-range models to structural glasses and we present a first comparison of these predictions with numerical results. We find evidence for the energy density relaxation at low temperatures consisting of…
Two photoluminescence (PL) bands were observed from Si+-implanted SiO2 films after rapid thermal anneal (RTA) at ⩾950 °C. The PL band at 2.2 eV was obtained from the films with RTA in dry nitrogen and the other one at 1.9 eV was obtained from the films with RTA in wet nitrogen. The luminescence at 2.2 eV disappeared a…
Almost 50 ternary transition-metal aluminides have been reported in the ordered ${\mathrm{BiF}}_{3}$ structure, representing roughly half of the observed ordered ternaries. To investigate the possible occurrence of other aluminides in this structure, the heats of formation of 38 ordered ${\mathrm{M}}_{2}\mathrm{NAl}$…
The scalar photoinduced changes of the optical absorption edge and the optical constants in amorphous Se75Ge25 chalcogenide thin film have been studied using XeCl excimer laser light with a wavelength of 306 nm. The glass transition temperature (Tg) of this material is evaluated to be approximately 220 °C, at which th…
The morphology of binary blends of poly(styrene)−poly(2-vinylpyridine) (PS−PVP) diblock copolymers of the type (A−B) α + (A−B) β was examined in a thin-film geometry using neutron reflection (NR), transmission electron microscopy (TEM), and self-consistent field (SCF) calculations. Blends of symmetric diblock copolyme…
Supramolecular liquid-crystalline polymeric complexes derived from polyamides containing 2,6-bis(amino)pyridyl units in their main chains and benzoic acid derivatives have been obtained by the formation of intermolecular double hydrogen bonds. The polymeric complexes behave as single liquid-crystalline polymers and ex…
Pronounced structure in x-ray excited luminescence (XEL) has been observed in dilute Tb-doped Y2O3 (Y2O3:Tb) nanocrystals. This effect affords a means to assess different energy transfer mechanisms in the nanocrystals and also an opportunity for novel device applications. Sharp jumps and oscillations are found in the…
The vibrational modes of ${\mathrm{H}}_{2}$ molecules in Si are found using a first-principles method and compared with recent experimental investigations. The isolated molecule is found to lie at a ${T}_{d}$ interstitial site, oriented along [011] and is infrared active. The rotational barrier is at least 0.17 eV. Th…
The room-temperature functionalization reaction between poly(styryl)lithium and propylene oxide in benzene was studied. The functionalized polymer was characterized by 1 H NMR, 13 C NMR, and APT- 13 C NMR. 13 C-methyl-labeled propylene oxide-functionalized polystyrene was also synthesized and characterized. Hydroxylat…
A computer-based lattice model of the step growth reaction of an AB2 monomer, the next elaborate system after an AB monomer, has been devised that allows the simultaneous and explicit occurrence of inter- and intramolecular reactions of A and B groups of the flexible and moving molecules according to Monte Carlo selec…
We have measured the magnetization and magnetostriction of Mn 3 GaC in pulsed high magnetic fields up to 37 T and the magnetization under steady magnetic field and pressure up to 0.82 GPa. Mn 3 GaC is antiferromagnetic (AF) at low temperatures. It exhibits successive transitions to an intermediate (I), to a ferromagne…
The synthesis and X-ray structural characterization of two manganese(III) porphyrazine (tetraazaporphyrin) complexes are reported: [Mn(Et 2 dtc)ODMAPz] ( 1 ) and [Mn(Cl)ODMAPz] ( 2 ) (Et 2 dtc = diethyldithiocarbamato; ODMAPz = 2,3,7,8,12,13,17,18-octakis(dimethylamino)porphyrazinato). In both 1 and 2, the Mn(III) ion…