Showing papers in "Materials Letters in 1987"

TL;DR: In this article, the maximum possible amorphization range, closely related to the solid solubilities, and the heat of formation of the system, were found to be important in determining the readiness of glass formation.

TL;DR: Amorphous NixNbx−1 powders were prepared by mechanical alloying for 0.2 ⩽ x ⩾ 0.8 and optical and electron microscopic examinations.

TL;DR: In this article, the fabrication and optical properties of Nd3+-doped silica-based optical fibres as a function of core glass composition are discussed and the absorption and fluorescence spectra are shown to be very dependent on P2O5 concentration.

TL;DR: In this article, a sol-gel route in which Zn and Nb were prereacted to form Zn[Nb(OEt)6]2 in situ was described.

TL;DR: In this paper, thin films of cupric oxide are deposited by a rf sputtering method using only oxygen glow discharge and their optical properties are measured in the wavelength region of 0.5-0.8 μm.

TL;DR: In this paper, X-ray diffraction, four-probe electrical resistance and susceptibility measurements have been performed on class I and II ceramic superconductors produced by the sol-gel process.

TL;DR: In this paper, fine powders consisting of 0.1-0.5 µm size crystallites of CaTiO3 are prepared at 150-200°C by the hydrothermal method starting from hydrated titania gel and reactive calcium oxide suspended as an aqueous slurry in an autoclave.

TL;DR: In this article, it was shown that amorphous and heattreated indium sulfide powders using electron microscopy (SEM, TEM), electron beam microprobe (EMPA), and X-ray diffraction (XRD) can give a glass transition at 330°C and a crystallization exotherm on heating at 390°C in a DSC.

TL;DR: In this article, thermal conductivity data for anodized aluminum coatings prepared in sulfuric acid solutions were found using a transient heat-flow method, and the results ranged from 0.5 to 1.0 W/m K, more than an order of magnitude lower than the thermal conductivities of bulk, polycrystalline aluminum oxide.

TL;DR: In this paper, a model for MgH 2 → Mg transformation was presented in terms of the hydrogen defect formation and the orientation relationship between Mg H 2 and Mg lattices.

TL;DR: In this paper, spherical Al(OH)3 particles were produced by precipitation of aqueous Al(NO3)3 solutions present in the cores of reverse micelles suspended in a supercritical propane continuous phase, to which NH3 was introduced.

TL;DR: In this paper, a two-step post-sintering heat treatment has been applied to both systems in order to improve the coercivity, and the results show that the second-step heat-treatment temperature is lower for the oxide-doped magnets for an optimum intrinsic coercivity.

TL;DR: In this paper, thin films of yttria-stabilized cubic zirconia have been grown on GaAs (100) substrates by pulsed laser evaporation at room temperature.

TL;DR: The magnetic phase with the assumed composition Fe10 TiSm, which was originally described as Ti-stabilized Fe5Sm in sputtered films and recently said to be tetragonal with a = 0.606 and c = 1.677 nm, is shown to actually have the tetragonal Mn12 Th structure type as discussed by the authors.

TL;DR: In this paper, it was shown that it is possible to obtain an adequate crystal structure by using a PZT powder containing 100% excess PbO and by controlling the temperature in such a way to melt only the pbO, which behaves as a binder.

TL;DR: In this article, temperature programmed desorption (TPD) is used to study the removal of oxygen as well as other impurities from YBa 2 Cu 3 O 7 superconductor.

TL;DR: YBa 2 Cu 3 O 7−δ was prepared in the glassy state by rapid solidification from the melt and the quenched material was paramagnetic down to liquid-He temperature as mentioned in this paper.

TL;DR: In this article, the formation of metastable tetragonal ZrO 2 and its transformation to the stable monoclinic phase is studied as a function of temperature, which is related to the fine particles and small crystallites obtained.

TL;DR: In this article, the authors showed that the structure of Ru 2 Si 3 is orthorhombic with four-fold like symmetry rather than tetragonal, which is the first time that a Ru thin film has been grown on (111) Si.

TL;DR: In this paper, a high-pressure Raman technique up to 17 GPa in a diamond anvil cell was used to investigate the transition from the ferroelectric to the paraelectric phase under the influence of pressure.

TL;DR: In this paper, solid-state magic angle spinning (MAS) and cross-polarization (CP)-MAS 29 Si NMR spectroscopy was used to monitor polycondensation in alkoxide-derived silica gels during thermal treatment from 25 to 800°C.

TL;DR: In this article, cross-sectional micrographs through a silicon/silicon dioxide/polysilicon structure are presented, showing interface roughness at the substrate/oxide boundary.

TL;DR: In this article, a near stoichiometric thin films of ternary semiconductor material ZnSnP2 have been grown by the vacuum growth technique and the surface morphology of the grown films is examined.

TL;DR: In this paper, the effect of firing conditions on transformation between α and β sialons and the role of La 2 O 3 on densification as well as the formation of α′-sialon are discussed.

TL;DR: In this article, a polycrystalline silicon film self-implanted at a dose of 2 × 10 15 ions/cm 2 was found to be due to the nucleation of crystallites and not to the growth of grains that survived the implant.

TL;DR: In this paper, electron microscope observations of beginning compound formation in a mixture of Ni and Al powders under shock-wave loading are reported. Key findings are an amorphous phase, the precipitation of NiAl from the same matrix, and a lamellar and a "tweed" microstructure.

TL;DR: YBa2Cu3Ox superconductors were synthesized from mixed powders of Y2O3, BaO2, and Cu2O under oxygen, air, and argon atmospheres as mentioned in this paper.

TL;DR: In this article, X-ray diffraction was used to decompose YBa2Cu3O7−x particles of size 1 to 10 μm in moisture-saturated air at 23 °C.

TL;DR: In this article, the pyroelectric properties of a hot-pressed PLZT (8/40/60) were investigated in some detail to evaluate its potential as a prospective pyro-electric infrared detector material.

TL;DR: In this paper, the dielectric properties of the ceramics sintered at 950-1000 ° C are interpreted in terms of the introduction of lithium in the perovskite matrix with creation of anionic vacancies; this model is in agreement with the ability of lithium to take both the octahedral and tetrahedral coordinations.