We present the realization and analysis of microwave performances interdigited varactors integrating thin ferroelectric layers barium strontium titanate (BaxSr1?xTiO3). Devices based on films different compositions (x = 0.8 x 0.5) have been characterized in millimeter-wave domain, from 200 MHz to 110 GHz. By applying bias voltages, tunability capacitance can reach up 40% for Ba0.8Sr0.2TiO3 comp...

A metamaterial based on periodic ferroelectric inhomogeneities in a magnetic ferrite matrix including quantity of composite matrix, demonstrating relative low microwave losses and effective dielectric permittivity, was produced. Glass-ceramic composites, consisting low-melting glass barium-strontium titanate, were successfully synthesized incorporated into the holes to build meta-structure. Inv...

The surface structure of (110) faceted strontium titanate nanoparticles synthesized via solvothermal method has been resolved using high-resolution electron microscopy (HREM). We demonstrate that the surface is a titania-rich structure containing tetrahedrally coordinated TiO4 units similar to the family of (n × 1) reconstructions observed on (110) surfaces of bulk crystalline strontium titanat...

Strontium titanate (SrTiO 3) is one of the best studied substances showing a displacive phase transition [1]. At ambient temperature, it exhibits a cubic perovskite structure with the space group Pm3m. On cooling, a Brillouin zone-boundary softmode drives the second-order transition to an antiferrodis-tortive phase at T C = 105 K. The primary order parameter is the antiphase rotation of TiO 6-o...

INTRODUCTION The extent of wound contamination in gunshot injuries is still a topic of controversial debate. The purpose of the present study is to develop a model that illustrates the contamination of wounds with exogenous particles along the bullet path. MATERIAL AND METHODS To simulate bacteria, radio-opaque barium titanate (3-6 μm in diameter) was atomized in a dust chamber. Full metal ja...

In this work, the inductively coupled plasma etching technique was applied to etch the barium titanate thin film. A comparative study of etch characteristics of the barium titanate thin film has been investigated in fluorine-based (CF4/O2, C4F8/O2 and SF6/O2) plasmas. The etch rates were measured using focused ion beam in order to ensure the accuracy of measurement. The surface morphology of et...

Barium strontium titanate exhibits ferroelectric or paraelectric behavior that depends upon the composition and other factors, making it suitable for several applications. We have adopted conventional solid-state reaction route to synthesize magnesium-substituted barium with magnesium concentration (Mg = 0, 0.005, 0.010, 0.015). X-ray diffraction has confirmed perovskite cubic single phase. The...