Materials Literature
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An optically addressable spatial light modulator is developed that has a reversible storage capability and cascadability. It consists of a sandwich structure of a hydrogenated amorphous-silicon photoconductor, a dielectric mirror, and a surface-stabilized ferroelectric liquid crystal in a chiral smectic C phase. This…
Line (string) defects at which the molecular orientation changes by 0, \ensuremath{\pi}/2, or \ensuremath{\pi} rad are reported in few-layer-thick freely suspended tilted smectic liquid-crystal films. These defects are ubiquitous, appearing in chiral and nonchiral smectic-C, hexatic, and antiferroelectric phases, eith…
The authors present a theoretical and numerical study of certain properties of X-ray diffraction of finite-size Rudin-Shapiro and generalized Rudin-Shapiro multilayer heterostructures. They are compared with spectra obtained in similar conditions from other deterministically disordered multilayer systems, in particula…
Liposomes can be loaded with weak acids and bases, which exist in solutions in equilibrium with membrane permeable uncharged form, using various gradients across their membranes. Because in some cases the estimated drug concentration in the loaded liposomes exceeds their aqueous solubility we investigated the physical…
The scanning transmission x-ray microscope at the National Synchrotron Light Source has been used to record x-ray absorption near-edge structure (XANES) spectra from 0.01-square-micrometer regions of organic specimens. The spectral features observed reflect the molecular structure of the dominant absorbing atoms and p…
Abstract The correlation of 2D conjugation and the nonlinear properties of a series of polycyclic aromatic compounds were studied by performing semiempirical calculations using the MOPAC package. For linear polyacenes, both linear and nonlinear properties are found to be increased as the number of six‐membered rings i…
Piezoelectric materials lie at the heart of ultrasonic transducers. These materials convert electrical energy into mechanical form when generating an interrogating acoustic pulse and convert mechanical energy into an electric signal when detecting its echoes. This paper first surveys the piezoelectric materials in cur…
Thermal stresses in GaAs on sawtooth-patterned Si substrates are studied by elastic finite element analysis under the assumption of plane strain. A comprehensive description of the highly nonuniform stress distribution is given and the possibility of band gap engineering by adjusting the geometrical characteristics of…
Iron amalgams have been studied by Mossbauer spectroscopy and magnetization measurements between 7 and 425 K. The Mossbauer spectra at 12 K show that the iron is present in at least two different sites. After heat treatments the Mossbauer spectra change into the typical spectrum of alpha -Fe, and the magnetic moment p…
It is shown that in pulsed laser deposition, there exists an optimal target-substrate distance for each deposition O2 pressure necessary for the growth of high quality superconducting films. This result indicates that plasma dynamics plays an important role in forming the superconducting films. A scaling law of PD2=co…
By utilizing copper phthalocyanine (CuPc) and TiOx, we report the fabrication of organic–inorganic heteromultilayer structures as a new concept of optoelectronic material. These are based on an anticipated model where charge carrier photogeneration occurs in the CuPc layers, while the TiOx layers have the role of tran…
Inelastic neutron scattering experiments in K 2 SeO 4 , Cs 2 SeO 4 and K 2 CrO 4 are reported. The lowest Sigma 3 - Sigma 2 phonon branches along the alpha *-axis in their Pnam phase have been characterised for the three compounds. The results are compared with recent lattice dynamical simulations using rigid-ion mode…
The energy transfer properties of the Tm, Ho:LiYF 4 are examined, and special attention is given to the Tm( 3 F 4 ) to Ho( 5 I 7 ) transfer dynamics and equilibration. The measured transfer times are compared with the values calculated on the basis of the static Forster-Dexter and the migration-assisted Burshtein ener…
Extended x-ray absorption fine structure measurements from Er-implanted Czochralski-grown Si samples, which exhibit strong luminescence at 1.54 μm, reveal a local sixfold coordination around Er−not of Si−but of oxygen atoms at an average distance of 2.25 Å. By contrast, similar concentrations of Er implanted in high p…
We have studied the origin of visible photoluminescence of Ge nanocrystals in SiO2 glassy matrix. Spectroscopic analyses of Ge nanocrystals indicate that the room-temperature photoluminescence comes from Ge nanocrystals of diameter of 4 nm or less. High-resolution electron microscopic studies imply that the structure…
Process for getting crack-free lead zirconate titanate (PZT) thin films micropatterned on Si substrate is demonstrated. The PZT film was deposited at temperatures below 300°C by magnetron sputtering using a ceramic target, and then etched before annealing. After annealed above 500°C to get perovskite phase, the PZT fi…
Article Structure solution and Rietveld refinement of beryllophosphate-H zeolite was published on November 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 201, issue 1-4).
The amount and quality of clay minerals in Hungarian soils show considerable differences. In relation to this, in long‐term multi‐location field experiments, different levels of K supply have developed even when fertilized at the same K fertilizer rate. In an incubation experiment (4 weeks at constant temperature and…
Abstract Photosensitive polyamic acid involving substituted 3, 5‐diaminobenzamide has been developed for photopatternable polyimidesiloxanes. This precursor, formulated with photosensitizers, was used to develop fine patterns by i‐line UV exposure. The curing of polyamic acid was investigated by using FTIR and physica…
In 1959 the famous bongo payer and Nobel laureate Richard Feynman first posed the question: “Why can't write the Encyclopedia Britannica on a pinhead?”. If an electron beam could be focused to a spot only one atom in diameter, he reasoned, then it might interact with individual atoms on a surface and writing on an ato…