Materials Literature
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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…
A side-chain liquid crystal (LC) block copolymer with a ferroelectric smectic C* LC block has been shown to exhibit bistable switching behavior in electric fields. Ferroelectric switching was demonstrated for block copolymers with volume fractions of 0.58 and 0.52 liquid crystal block. SAXS and TEM showed that the bul…
Raman scattering, pyroelectric current, and dielectric susceptibility measurements have been carried out on a series of tetragonal and rhombohedral-structured Pb1−xLax(ZryTi1−y)1−x/4O3 (PLZT) ceramics, under zero-field heating after zero-field cooling (ZFH/ZFC) and zero-field heating after field-cooling (ZFH/FC) condi…
The doubly rare-earth doped phosphor SrS:Eu,Sm is representative of a class of stimulable phosphors that may find application in optical data storage and related areas of photonic technology. The infrared photoluminescence (PL) from the ${\mathrm{Sm}}^{2+}$ ions is a potentially useful probe of the ``written'' state o…
The (110) surface of many transition metals undergoes reconstructions either on the clean substrate or induced by adsorbates. The reconstructions can be induced by a variety of strongly bound adsorbates, e.g., H, O, S, and alkali-metal atoms. In this work, H/Pd(110) is chosen as a prototype of such reconstructions. Th…
Steady-state charge transport via motion of charge-density waves (CDW's) requires conversion between collective CDW conduction and quasiparticle conduction in the vicinity of current injection contacts. The conversion occurs via phase slip, in which CDW amplitude defects form and move in the presence of CDW strain so…