Publications by authors named "Antoni Winiarski"
Article Synopsis
- The study examined the dielectric properties of BaCaTiO ceramics (with x = 0.17) across a frequency range from 20 Hz to 53 GHz, revealing a ferroelectric phase transition near 339 K.
- It was found that the distribution of relaxation times showed characteristics typical of an order-disorder ferroelectric transition, while below 200 K, relaxation times followed the Arrhenius law.
- The results indicated that as frequency increased, the temperature at which the imaginary part of dielectric permittivity peaked shifted significantly, which was linked to the dynamics of titanium ions, and the paper discusses the transition from ferroelectric to relaxor behavior in these ceramics.
Zero-valent iron has received considerable attention for its potential application in the removal of heavy metals from water. This paper considers the possibility of removal of zinc ions from water by causing precipitates to form on the surface of iron. The chemical states and the atomic concentrations of solids which have formed on the surface of zero-valent iron as well as the type of the deposited polycrystalline substances have been analyzed with the use of X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively.
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