Abstract:
Rare earth metal containing compounds of the formula Sr2LuSbO6 and Sr2LaSbO6 have been prepared as high critical temperature thin film superconductor structures, and can be used in other ferroelectrics, pyroelectrics, piezoelectrics, and hybrid device structures.
Abstract:
Single-phase, non-cubic and single-phase, cubic ferroelectric/paraelectric lead-based perovskite-structured materials having reasonably low and fairly temperature insensitive dielectric constants (stable dielectric constants over a wide range of operating temperatures of −80° C. to 100° C.), reasonable loss tangents (
Abstract:
Apparatus for the precise positioning of a sample of dielectric material into a cavity resonator system for obtaining dielectric constant, and other measurements. Precision micrometer drive units are provided to move the sample about a vertical axis, to tilt the sample, and to move the sample in X, Y and Z directions. The drive units are positioned on a bearing slide for ease of sample positioning into and out of the cavity. Selected drive units are controllable from a remote location so that the apparatus may be utilized in an environmental chamber whereby measurements may be accomplished without opening the chamber after each measurement. All components of the resonator system, positioning units, cables, etc. are chosen such that they are operable over the desired temperature range of operation.
Abstract:
Single-phase, non-cubic and single-phase, cubic ferroelectric/paraelectric materials comprising a charge compensated lead-based perovskite having the general formula ABO3 is provided, which has reasonably low and fairly temperature insensitive dielectric constants over operating temperatures of −80° C. to 100° C., reasonable loss tangents (
Abstract:
The microwave properties of numerous perovskite antimonates like A2MeSbO6 where A=Ba or Sr, Me=a rare earth, Y, Sc, Ga, or In and A4MeSb3O12 where A=Ba or Sr and M=Li, Na or K were measured at 10 Ghz and 300 K. Using the microwave properties and lattice parameters of these materials, the Clausius-Mossotti relationship and a nonlinear regression fitting program, the polarizability of Sb5+ was investigated and determined to be 1.18±0.49 A3. This low polarizability and the low loss of antimonates in general indicate that Sb5+ is an excellent candidate for use as a constituent in the fabrication of low dielectric constant, low loss, lattice matching perovskite oxide microwave substrates.
Abstract:
Compounds of the general formula Ca.sub.2 MeSbO.sub.6 where Me is a 3+ ion selected from the group consisting of aluminum (Al), scandium (Sc), indium (In), gallium (Ga), or a rare earth metal have been prepared and included as the substrate or barrier dielectric in high critical temperature thin film superconductors, ferroelectrics, pyroelectrics, piezoelectrics, and hybrid device structures.
Abstract:
An ablation process by which fused deposits of silicon particles are accuated on a substrate of selected material in accordance with whether microclusters of spherical configurations or microfilaments of cylindrical configurations are to be fabricated. Silicon ablation is accomplished in an inert gas atmosphere with an excimer laser that generates light pulses of which the wavelength and frequency are controlled to fix the energy level thereof. The pressure of the inert gas atmosphere is also controlled in accordance with whether microclusters or microfilaments are to be fabricated.
Abstract:
c-axis oriented microwave quality HTSC films are deposited onto single crystals of gadolinium gallium garnet (GGG) using pulsed laser deposition (PLD) with conditions of 85 mTorr of oxygen partial pressure, a block temperature of 730.degree. C., a substrate surface temperature of 790.degree. C. and a laser fluence of 1 to 2 Joules/cm.sub.2 at the target, a laser repetition rate of 10 Hz and a target to substrate distance of 7 cm and in which the a and b lattice parameters of the GGG exhibit a mismatch of less than 2.5 percent with the a and b lattice parameters of the HTSC.