Materials Literature
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Scaling caused by Na 2 CO 3 −Na 2 SO 4 double salts constitutes a severe problem in black liquor evaporators. The ability to predict the solubility and solid-phase composition of these species would be conclusive in minimizing the adverse effects of scaling. Experimental solubility data for (sodium sulfate) dicarbonat…
ZnGa 2 O 4 particles that are regular octahedra in shape and uniform in size were synthesized on Si substrates via catalyst-free chemical vapour deposition. The surfaces of the octahedra are bounded by {1 1 1} facets. A model based on surface energy dependent growth rate is proposed for interpreting the appearance of…
Sensor performance for dual band forward looking infrared (FLIR) imagers can be substantially improved by increased simultaneous throughput of both sensor bands in the optical systems. Currently available antireflection coatings (ARs) have optimized performance for either spectral band, but not both on the same optic.…
Rhodamine 6G and Rhodamine B dye mixture doped polymer optical fiber amplifier (POFA), which can operate in a broad wavelength region (60 nm), has been successfully fabricated and tested. Tunable operation of the amplifier over a broad wavelength region is achieved by mixing different ratios of the dyes. The dye doped…
The tensile properties of segmented block copolymers with mono-disperse hard segments were studied with respect to the hard segment content (16-44 wt.%) and the temperature (20-110 °C). The copolymers were comprised of poly(tetramethylene oxide) segments with the molecular weights of 650-2,900 Da and of mono-disperse…
The uncooled infrared imaging revolution began when ferroelectric detectors based on barium strontium titanate (BST) demonstrated NETDs less than 100mK at prices sufficiently low for commercial applications. Although this technology produces unsurpassed image quality, it has been largely supplanted by microbolometer t…
In this work, I discuss the magnetocaloric effect under applied pressure, as well as the barocaloric effect, in the Laves phase compounds RCo 2 (R = Er, Ho and Dy). To this end, I use a model Hamiltonian including both localized 4f spins and itinerant 3d electrons. The calculations point out that (i) for an applied pr…
The evolution of the geometric and electronic structures within the entire series of lanthanide orthophosphate nanoparticles ( approximately 2- approximately 5 nm) has been determined experimentally with X-ray diffraction and near edge X-ray absorption fine structure spectroscopy. In particular, the interplay between…
PbTiO3/BiFeO3 (PB film), BiFeO3/PbTiO3 (BP film) multilayer structural films and pure BiFeO3 film (BFO film) have been deposited on LaNiO3/SiO2/Si substrates by the sol–gel process annealed at 600 °C. XRD results indicate that the films are well crystallized and no impure phases are observed. The results of ferroelect…
Die Ringöffnungspolymerisation (ROP) von racemischem β-Butyrolacton (BL) an den hoch aktiven Chrom(III)-Salophen-Katalysatoren 1 ergibt Poly(hydroxybutyrat) (PHB) mit hohem Molekulargewicht und Isotaktizitäten von 60–70 %. Das Material ist biologisch abbaubar, und seine mechanischen Eigenschaften lassen sich zwischen…
In this paper, we have fabricated for the first time films with different orientations of principal axes but similar principal indices and also films with different principal refractive indices but the same orientations of principal axes. During deposition, the deposition angle and the substrate sweep angle are varied…
The high level of accumulated expertise by ULIS and CEA/LETI on uncooled microbolometers made from an amorphous silicon layer enables ULIS to develop 384 x 288 (1/4 VGA) IRFPA format with 25 μm pixel-pitch designed for low end application. This detector has kept all the innovations developed on the full TV format R…
We present helium atom scattering measurements of the boson peak at the surface of vitreous silica between 127.0 and 368.5 K. The most probable energy shows a strong temperature dependence and increases linearly with temperature in the measured range. The observed blueshift of the surface boson peak (shift rate 0.008+…
The image contrast and clarity recorded by backside illuminated HgCdTe focal plane arrays (FPAs) is strongly dependent on minimizing signal loss and detector noise caused by scattered and reflected light from the FPA window and imaging optics. Thin film anti-reflection (AR) treatments based on stacks of thin-film mate…
This paper presents recent developments in next generation microbolometer Focal Plane Array (FPA) technology at L-3 Communications Infrared Products (L-3 CIP). Infrared detector technology at L-3 CIP is based on hydrogenated amorphous silicon (a-Si:H) and amorphous silicon germanium(a-SiGe:H). Large format high perfor…
Tetragonal PbTiO 3 under uniaxial stress along the c -axis is investigated from first-principles. The structural parameters, polarization, and squares of the lowest optical phonon frequencies for E (1TO) and A 1 (1TO) modes at Γ show abrupt changes near a stress σ c of 1.04 GPa, which is related to the dramatic change…
We present Raman scattering studies of the structural and magnetic phases that accompany temperature- and field-dependent melting of charge- and orbital-order (COO) in ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.25}{\mathrm{Pr}}_{0.375}{\mathrm{Ca}}_{0.375}{\mathrm{MnO}}_{3}$. Our…
High resolution chemical imaging of surfaces can be achieved using Tip Enhanced Raman Spectroscopy(TERS), an emerging technique that combines scanning probe microscopy with optical spectroscopy and takes advantage of apertureless near-field optics to obtain lateral resolution dramatically better than that provided by…
We investigate the possible application of a modified deoxyribonucleic acid (DNA)-dye system for dynamic processing of optical information, e.g., optical correlation. The system consists of a biopolymeric matrix made of DNA substituted with the cationic surfactant molecule cetyltrimethyl-ammonium chloride (CTMA) and d…
First-principles calculations were performed on $\text{Zn}{({\text{BH}}_{4})}_{2}$ using density functional theory (DFT) within the local density approximation and the projected augmented wave method. $\text{Zn}{({\text{BH}}_{4})}_{2}$ is a promising candidate for hydrogen storage with a capacity of 8.5 $\text{wt}\tex…