[en] These proceedings collect papers on materials for electronics. Topics include: tantalum oxide protective coatings, ion implanted benzene derived graphite fibers, kinetics of cavity growth on solder joints, failure mechanics in ceramic/metal systems, interfaces, and binding energy relations in metallic adhesion

[en] Dynamic properties of micron diameter bubbles in garnet compositions (EuYb)₃(FeGa)₅O₁₂, (EuTm)₃(FeGa)₅O₁₂, and (Eu)₃(FeGa)₅O₁₂, are reported. The coercivities and mobilities of these bubbles compare vary favorably with those of 5-6 micron bubbles. A mobility of 1000 cm/s/Oe was found for the composition Eu₀.₈ Tm₂.₂Fe₄.₅Ga₀.₅O₁₂. Despite the fact that Q (the ratio of anisotropy field to the saturation magnetization) is less than 5, these films contain all kinds of soft and hard bubbles, in contrast to what Smith et al. have reported in the case of 5 micron bubbles. However, it was found that when the Q is less than or equal to 2, there exists only one kind of bubble propagating at an angle with respect to the field gradient, in accord with their observation. The micron bubbles with no Bloch lines propagate at a larger angle with respect to the direction of the field gradient than 5 micron bubbles, in qualitative agreement with Slonczewski's theory. (auth)

No abstract available

[en] Superconducting thin films of Y1Ba₂Cu₃O(7-delta) have been prepared on single-crystal yttria-stabilized zirconia (YSZ) and SrTiO₃ substrates using metal trifluoroacetate spin-on precursors. The films exhibit resistive transition widths of 1.5-1.7 K with zero resistance at temperatures as high as 91-94 K. The superconducting phase is formed by first decomposing the trifluroacetate film to the fluorides and then converting the fluorides by reaction with water vapor. The properties of the films prepared on YSZ substrates depend on the amount of conversion of the fluorides by reaction with water. 18 references

[en] Knudsen effusion mass spectrometry, thermogravimetric analysis, X-ray diffraction, secondary ion mass spectroscopy, EM, and temperature-dependent resisitivity are used to study superconducting films of Ba₂RECu₃O(7-x) prepared from aqueous and aqueous-alcoholic mixed solutions of barium, rare earth, and copper nitrates. Alcohol is shown to lower the solubility of Ba(NO₃)₂. Precursor reaction paths were explored in order to optimize the furnace annealing schedule. The best samples obtained showed a Tc of 95 K and had a resistivity below 89 K. 11 references

[en] By varying the Ga concentrations x of EuTm₂Fe/sub 5-x/Ga/sub x/O₁₂ from x = 0 to about 0.8, thin magnetic films supporting stable bubbles with diameters from 0.5 to about 8 μm, respectively, are deposited epitaxially onto gadolinium gallium garnet substrates oriented (111). For low values of x, the Ga segregation coefficient is about 2 and it decreases slightly as x increases. Thus, films contain roughly twice as much Ga as the LPE fluxed melts in which they grow. Both the characteristic length and magnetic bubble stability factor (Q) increase rapidly with x and, to a lesser degree, so does the uniaxial anisotropy field H/sub A/ while both 4πM and the uniaxial anisotropy K/sub u/ decrease. (U.S.)

[en] This patent describes a superconductive combination. It comprises a crystalline gallate layer, including a rare earth element or another element selected from the group consisting of Y, La, Bi, and Sc, or combinations of a rare earth element and at least one of the another elements. A superconductive layer thereon, the superconductive layer having a transition temperature in excess of 77 degrees K. and being an oxide material having Cu-O planes whose Cu and O atoms align with Ga and O atoms in the gallate layer

[en] Ca(Tb)₃Ga₂Ge₃O₁₂ and Sr₃[Y(Tb)]₂Ge₃O₁₂ garnets provide a cubic lattice with trivalent terbium, a luminescent rare earth, in dodecahedral (8 oxygen neighbors) and in octahedral (6 oxygen neighbors) sites, respectively. In the materials examined, Tb³⁺ in octahedral sites has a narrower fluorescence emission spectrum, higher luminescence efficiency and a longer lifetime than in dodecahedral sites. The luminescence properties and the unit cell size of the Ca₃Y₂Ge₃O₁₂ garnet, where Tb³⁺ is expected to be located on octahedral sites, are between those of the CaGa and SrY garnets. All these garnets are phosphorescent. On the basis of the variation with temperature of the phosphorecence decay law, it is proposed that the radiative electron-hole recombination process proceeds via a tunneling mechanism at temperatures below the thermal glow peaks, and via a free carrier diffusion mechanism at temperatures above the thermal glow peaks. All three Tb³⁺-doped germanate garnets have sufficiently high efficiency and persistence under electron beam excitation to be suitable for practical phosphor applications. The strontium yttrium germanate-Tb material has a cathodoluminescence decay time nearly three times that of the commercial P53 garnet phosphor. (orig.)

No abstract available

[en] Superconducting films of bismuth strontium calcium cuprate were prepared by spray pyrolysis of mixed nitrate solutions onto heated (100) orientated MgO substrates, as well as yttria-stabilized zirconia and SrTiO₃. Various compositions and annealing temperatures were explored. Best results were obtained on MgO for a Bi_2.15Sr_1.68Ca_1.17Cu₂O_x composition after brief annealing in air just below its melting point. The superconductivity of the films is not significantly degraded by a 3 day immersion in water. 13 refs.; 2 figs