An accurate understanding of molecular structure evolution during pyrolysis is essential for the clean utilization coal. In this study, middle-rank coal was taken as research subject, and vitrinite inertinite samples were stripped from using a hand picking sink–float separation process. situ Fourier transform infrared (FTIR) spectroscopy in X-ray diffraction (XRD) performed to compare macromole...

The microwave cavity perturbation (MCP) technique is used to identify the transition from magnetite (Fe3O4) to the meta-stable form of maghemite (γ-Fe2O3). In this study Fe3O4 was annealed at temperatures from 60 to 300 °C to vary the oxidation. Subsequent to annealing, the complex permittivity and magnetic permeability of the iron oxide powders were measured. The transition to γ-Fe2O3 was corr...

our aim in this work is the synthesis and study optical and structural properties of gold nanoparticles.gold (iii) chloride trihydratewas taken as metal precursor, ascorbic acid at the presence of an appropriate amount of naoh as reducing agent and polyvinylpyrrolidonek-30 (pvp k-30) as a stabilizing and capping agent. the reaction was performed in high-speed stirring rate at room temperature.s...

The influence of the pressure on magnetic and superconducting properties polycrystalline MgB2 bulks was studied. Bulk samples were prepared using conventional in-situ solid state reaction hot-pressing methods. structural electromagnetic studied by x-ray diffraction (XRD), scanning electronic microscope (SEM), hysteresis (M-H) levitation force (Fz, Fx) measurements. XRD measurements proved high ...