Publications by authors named "Irena Gruszka"
Microcrystalline samples of CoREWO tungstates (RE = Y, Dy, Ho, Er) were prepared by a high-temperature solid-state reaction and then sintered into a ceramic form for unique properties and potential applications. For this purpose, structural, microscopic, ultraviolet-visible (UV-vis), magnetic, electrical, and thermoelectric measurements were performed. These studies showed a monoclinic structure, paramagnetism, short-range antiferromagnetic interactions in all samples, long-range ferrimagnetic interactions only in CoYWO, poor -type conductivity of 6.
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- 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.
Purpose: To investigate the effect of cryogrinding on chemical stability of the diuretic agent furosemide and its mixtures with selected excipients.
Methods: Furosemide was ground at liquid nitrogen temperature for 30, 60, 120 and 180 min. Mixtures of furosemide-PVP and furosemide-inulin (1:1) were milled under cryogenic conditions.