Recently, there has been significant interest toward the development of tunable dielectric materials for voltage-controlled, frequency-agile phase shifters and filters operating in the microwave regime. The fundamental challenge in designing materials systems for such tunable devices is the simultaneous requirement of high dielectric tunability ([40%) over a large temperature interval (-10 C to...

Precipitation of calcium in plants is common. There are abundant studies on the uptake and content of magnesium, strontium and barium, which have similar chemical properties to calcium, in comparison with those of calcium in plants, but studies on co-precipitation of these elements with calcium in plants are rare. In this study, we compared morphologies, distributional patterns, and elemental c...

Alkaline earth elements and alkali metals (Mg, Ca, Na and K) play an important role in the geochemical evolution of saline lakes as the final brine type is defined by the abundance of these elements. The role of major ions in brine evolution has been studied in great detail, but little has been done to investigate the behaviour of minor alkali elements in these systems despite their similar che...

A spectre-photometric method is described for the determination of magnesium* calcium, strontium and barium coexisting in binary mixtures. The method employs totramethyimurexide as an auxiliary ligand, and has been developed for pure two-component systems, such as are involved in investigations of cation-exchange equilibria on anionic polymers. The analysis is performed with calibration curves ...

Abstract Two-dimensional semiconductors can be used to build next-generation electronic devices with ultrascaled channel lengths. However, need integrated high-quality dielectrics—which are challenging deposit. Here we show that single-crystal strontium titanate—a high- κ perovskite oxide—can two-dimensional using van der Waals forces. Strontium titanate thin films grown on a sacrificial layer,...

Universal nonlinear scattering processes such as Brillouin, Raman, and Kerr effects are fundamental light-matter interactions of particular theoretical and experimental importance. They originate from the interaction of a laser field with an optical medium at the lattice, molecular, and electronic scale, respectively. These nonlinear effects are generally observed and analyzed separately, becau...

Heterofunctionalization catalysis with organometallic complexes of calcium, strontium and barium BY ANTHONY G. M. BARRETT1, MARK R. CRIMMIN2,*, MICHAEL S. HILL2 AND PANAYIOTIS A. PROCOPIOU3 1Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, UK 2Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK 3GlaxoSmithKline Medici...

Cubic BaTiO3 particles of∼10 nm were crystallized predominantly within the hydroxylated polybutadiene matrix of a phase separated triblock copolymeric thin film of polystyrene-polybutadiene-polystyrene (Kraton D1102). The barium titanated Kraton thin film had remnants of the cylindrical morphology of a plain Kraton thin film with an interdomain spacing of ∼23 nm. The procedure of barium titanat...

This study reports the synthesis of morphology-controlled BaTiO(3) nanostructures such as spherical, cube-shaped and rod-shaped BaTiO(3) using a molten-salt synthesis method. This method synthesized products from a reaction of BaO/BaCO(3) and TiO(2) with a eutectic mixture of NaCl-KCl flux at 700 degrees C for 1 h. The experiment used powder X-ray diffraction, field emission scanning electron m...

An optimal strategy for cascading phased-array deflectors is presented that allows for high-resolution random-access beam steering with continuous scan-angle control but requires a minimum number of control lines. The system is analyzed theoretically by use of a Fourier optics approach and then verified experimentally. A pair of 32-channel optical phased arrays fabricated by use of surface elec...