The effect of different muffling environments on the structure and dielectric losses of Ba(Zn1/3Nb2/3)O3 (BZN) microwave ceramics was investigated. The microwave dielectric losses of stoichiometric BZN pellets heated in ZnO-rich environments were severely degraded (e.g. Q×f~15 000 in ZnO powder) compared with samples muffled in their own powder (Q×f~80 000). Structure analyses and gravimetric m...

MgTe2O5 ceramics were prepared by solid-state route. These materials were sintered in the temperature range of 640–720 °C. The structure and microstructure of the compound was investigated using x-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM) techniques. The dielectric properties of the ceramics were studied in the frequency...

The ferroelectricity of the Poly(vinylidene fluoride-trifluoroethylene-chlorofloroethylene) terpolymer films fabricated by the Langmuir–Blodgett (LB) technology were investigated from 180 to 300 K. The temperature dependence of the remanent polarization and the dielectric response shows a broad peak at ~ 270 K, suggesting a ferroelectric phase transition. Contrary to the perovskite relaxor, a d...

In this work, effective electric permittivity and magnetic permeability of metallic–dielectric mixtures are extracted from electromagnetic full 3D simulation data in the microwave range. The numerical method used here is the finite integration technique with periodic boundary conditions. Simulated mixtures have periodic extend in directions perpendicular to the direction of the plane wave. Thus...

Temperature measurement in microwave systems is essential for thermally driven processes, namely, catalytic reactions and ceramic sintering. Although, the application of direct thermometry methods, namely, thermocouples, have been commonly articulated in the available literature, however, contacted temperature measurement mechanisms have aroused concerns associated with the disruption of the el...

Introduction: NASA is evaluating various methods to process lunar and Mars regolith in preparation for future missions. We have performed earlier studies [1-3] to understand the mechanism associated with the lunar regolith’s excellent absorbtion of microwave energy that is useful for microwave processing. Using an upgraded microwave heating facility we have shown that the previously observed [4...

Magnetically Assisted Abrasive Finishing (MAAF) processes are most suitable for obtaining quality finish on plane, internal and external cylindrical surfaces of metallic as well as non-metallic materials. These products are highly demanded in modern industrial applications. In spite of remarkable results of MAAF processes, the major constraint towards wide spread use of this technology is the n...

Microwave heating is applied for processing different silicon raw materials, based on the size-, shapeand composition-dependent absorption of radiation of 2.45 and 916 MHz frequency by silicon. In model experiments directed towards the improvement of melting technology, Si-fines and chunks of bulk Silicon from Electronic Grade (EG)and Solar Grade (SG)-silicon production are used as raw material...