Materials Literature
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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…
Abstract The scope of this paper is to review peroxide curing of ethylene-propylene elastomers, where apart from crosslinking, other reactions occur, such as chain scission, which account for the drop in physical properties. The results are compared with an alternative crosslinking system which is being assessed in ou…
Phase equilibria in the system HfO 2 –Y 2 O 3 –CaO were studied in the temperature range 1250° to 2850°C by both experimental methods (X‐ray phase analysis at 20° to 2000°C, petrography, annealing and quenching, differential thermal analysis in He at temperatures to 2500°C, thermal analysis in air using a solar furnac…
The electronic Raman spectrum of ${\mathrm{Fe}}^{2+}$ ions in ${\mathrm{FePS}}_{3}$ and ${\mathrm{FePSe}}_{3}$ layered crystals is studied and interpreted in a quasimolecular approach for the iron and its environment. We apply crystal-field theory, and the transition probability for the electronic Raman process is com…
Lactobacillus plantarum ATCC 8014 grew on melibiose at 30 C, but not at 37 C, although it grew on galactose or lactose at either temperature. ATCC 8014 grown on lactose at 30 or 37 C accumulated melibiose slowly, suggesting that melibiose may partly be transported by a lactose transport system. A lactose-negative muta…
The radiation absorbed dose to non-water equivalent materials of interest in radiotherapy is the dose to lung and the dose to bone. The measurement and calculation of dose to the lung has been of great interest and much effort has gone into the development of accurate lung dose calculation methods. The radiation absor…