Showing papers in "Materials Letters in 1984"

TL;DR: In this paper, the structure of porous silicon is described by using both electron microscopy observations and gas adsorption experiments and a quite narrow pore size distribution is found, with pore diameters ranging between 50 and 100 A.

TL;DR: In this article, it was shown that lead-phosphate nuclear waste glasses can be prepared at temperatures as low as 800°C, since they exhibit very low melt viscosities in the 800-1050°C temperature range.

TL;DR: The phases coexisting with the magnetic boride Fe14Nd2B at 298 K are α-Fe, Fe, Fe17Nd 2, Fe4NdB4, and α-Nd Metastable βNd.

TL;DR: X-ray evanescent and standing-wave fluorescence measurements made using a platinum-carbon layered synthetic microstructure (LSM) overcoated with a 5 A hafnium layer are reported and compared with model calculations.

TL;DR: In this article, the EPR spectra of BaTiO 3 ceramics, exhibiting the PTC effect, showed two signals at room temperature with g = 1.963 indicating activation of the corresponding defect centres, possibly V'Ba, causing diminution of charge carriers.

TL;DR: In this article, a modification for the MOVPE of CMT is described and the quality of these epitaxial layers is discussed, and a new method, interdiffused multilayer process (IMP), has enabled the growth of the CMT with very good compositional uniformity comparable with LPE.

TL;DR: In this article, a sol-gel process is described for the preparation of diphasic composite materials, which involves the growth of extremely fine crystalline or non-crystalline materials inside a pre-made gel structure by soaking the gel in metal nitrate solution and subsequent precipitation of the metal with the selected anions (using mineral acids) followed by a densification step.

TL;DR: In this article, the results obtained by ion irradiation are compared with previous studies of high-temperature thermal processing of metal films on SiO 2, and the results show that ion irradiated metal atoms can form an island structure.

TL;DR: In this paper, single crystal lead scandium tantalate micro-domains with an ordered arrangement of Sc: Ta have been observed directly in transmission electron microscopy and the scale of the ordered structures in the size range 35 to 120 nm agrees well with earlier indirect measurements from X-ray superlattice line broadening.

TL;DR: In this paper, the atomic structures of displacement cascades and amorphous-crystalline interfaces in silicon, ion implanted at 4 K, using high-resolution electron microscopy were investigated.

TL;DR: In this paper, a vertical-constriction patterning technique was used to obtain uniform (100) texture for SiO2 films. But the texture of the films changes from (100)-to random as the thickness is increased beyond 5 μm.

TL;DR: In this article, the anisotropy field versus temperature of polycrystalline Nd 15 Fe 77 B 8 and a Neomax magnet has been measured between 77 and 300 K applying the SPD technique.

TL;DR: Visible Kr + laser light has been used to grow amorphous SiO 2 from gaseous mixtures of SiH 4 and N 2 O as mentioned in this paper, which has been shown to work well in the field of computer vision.

TL;DR: In this article, the influence of annealing of resistant polycrystalline thin films in neutral atmosphere on the basic transport parameters is reported and it is deduced that the α to β phase transition in In 2 Se 3 thin films occurs around 200°C, as in the case of single crystals.

TL;DR: In this article, the Gibbs free energy of formation of LaMnO 3 from La 2 O 3 and MnO(s) was obtained as ΔG 0 f, T = −130.9 + 0.0329 T kJ/mol.

TL;DR: In this paper, the activation energy and frequency factor for the interdiffusion process were calculated in the concentration range 10 − 90 wt% Fe. The analysis of the diffusion data indicated a vacancy-aided diffusion mechanism.

TL;DR: In this article, the effect of pressure on the polymerization kinetics of the sol-gel Si(OCH3)4 solgel process has been investigated at a molecular level using 29Si NMR spectroscopy.

TL;DR: In this article, a layered model is proposed to describe planar (or nearly planar) uranium containing clusters, wi U-U distances of 3.3 A, are observed.

TL;DR: In this paper, it was shown that the series of progressively shallower ground states observed for the thermal donors found after annealing Czochralski silicon at ≈ 450°C can be explained by assuming that successive steps in the agglomeration of oxygen introduce a repulsive potential which the Rydberg electrons experience and that the volume of this repulsion grows with each agglomation step.

TL;DR: The feasibility of carrying out infrared studies of intermediate chars, i.e., chars produced by pyrolysis of carbonaceous materials in the 450°-650°C range, is examined in this paper.

TL;DR: In humid air environment, the diodes show current switching between a high resistivity off-state and (fluctuating via intermediate states) a maximum low resistivity on-state, dependent upon frequency and shape of the voltage-time trains.

TL;DR: In this paper, the heterointerfaces in GaAs/AlAs semiconductor superlattices were examined on the atomic scale using high-resolution transmission electron microscopy and were found to be atomically smooth and without defects.

TL;DR: In this article, the surface of InP by ruthenium treatment increases the Schottky barrier height of Ag/n-InP junctions from 0.58 to 0.75 eV.

TL;DR: In this paper, commercial Al bronzes (≈5 at% Fe, 13-28 at% Al) have been laser surface melted and investigated by glancing-angle X-ray diffraction.

TL;DR: A variety of electron analytical techniques have been used to show that, when sodium aluminum hydride crystals are examined inside an electron microscope, beam-induced decomposition results are obtained as discussed by the authors.

TL;DR: In this paper, a closed tube CVD technique was used to grow chalcopyrite CuAlTe 2 single crystals and the thermodynamic growth parameters, the presence of spurious species and the ΔH f and ΔS f calculation were discussed in order to determine the optimum growth conditions.

TL;DR: In this article, a method for making self-supporting lateral-silicide diffusion couples for transmission electron microscopy (TEM) investigations is described, and the lateral growth of Ni and Pd silicides is compared.

TL;DR: In this article, it was shown that electric fields may be used to induce nucleation and grow crystals, and this has consequences for nucleation theory and must have many applications, such as medical applications.

TL;DR: In this article, a bundle of continuous synthetic fibers each having a diameter of about ten microns has individualized metallized layers coated to a thickness of about one to three microns and the whole lot is covered by dielectric insulation.

TL;DR: Optical transmittance and reflectance for thin silver films on glass were reported in this article, where the films were prepared by dc magnetron sputtering in 0.4-31 mTorr Ar pressure.