In this work, the electrocaloric effect (ECE) and electrocaloric strength (Δ/) were measured and thermal and dielectric studies were performed on Pb-modified BaTiO (BPT). The saturated hysteresis loops and normal ferroelectric behavior of the ferroelectric ceramics allow the utilization of the indirect method to estimate the electrocaloric properties. The electrocaloric measurements were performed under high (18 kV/cm) versus low (8 kV/cm) electric field conditions.
View Article and Find Full Text PDFThis work presents the microstructure and properties of two-phase amorphous melt-spun alloys ejected from the crucible with partition between liquids. The microstructure was studied by scanning electron microscopy and transmission electron microscopy and the phase composition was studied by X-ray diffraction. The thermal stability of the alloys was determined using differential scanning calorimetry.
View Article and Find Full Text PDFIn this paper, we studied some ferroelectric properties of archetypal oxide uniaxial ferroelectric single crystals of PbGeO modified by Ba ions. They include dielectric, DSC, ferroelectric polarization, and electrocaloric effect (ECE) measurements. The measurements show that increasing Ba doping considerably influences all the measured parameters, mainly by lowering the Curie temperature, gradually diffusing the phase transition, and decreasing values of polarization as well as the coercive field.
View Article and Find Full Text PDFFerroelectric ceramics BaTiO:x%Eu (x = 0, 0.1, 1, 2, 3) were synthesized by a conventional method. Structural investigation confirmed that all ceramics possessed tetragonal () symmetries at room temperature for the undoped ceramics as well as for the doped ceramics.
View Article and Find Full Text PDF: Emerging Dielectric, Piezoelectric, and Ferroelectric Ceramic and Crystalline Materials and their Applications is an open Special Issue of , which aims to publish original and review papers on new scientific and applied research and make great contributions to the identification and understanding of ceramic and crystalline materials which today enable applications that were previously virtually unimaginable [...
View Article and Find Full Text PDFLead zirconate PbZrO has been the subject of research interest for several dozen years. Recently, even its antiferroelectric properties have started to be questioned, and many researchers still deal with the so-called intermediate phase below Curie temperature (T), whose existence is not fully understood. It turns out that PbZrO doped with Nb exhibits below T phases with complex domain structures.
View Article and Find Full Text PDFThe aim of this work was to investigate the features of microstructure, phase composition, mechanical properties, and thermal stability of the two-component melt-spun Ni55Fe20Cu5P10B10 alloy. The development of the microstructure after heating to elevated temperatures was studied using scanning electron microscope and in situ high temperature X-ray diffraction. The high-temperature behavior of the two-component melt-spun Ni55Fe20Cu5P10B10 alloy and Ni40Fe40B20, Ni70Cu10P20, and Ni55Fe20Cu5P10B10 alloys melt-spun from single-chamber crucible was investigated using differential scanning calorymetry at different heating rates and by dynamic mechanical thermal analysis.
View Article and Find Full Text PDFThe Mössbauer effect was used to study the structural transitions in a PbZrSnO single crystal. Two kinds of quadrupole splittings were registered and connected with two different environments of the Sn ion occupying the center of SnO octahedra. What is responsible for the existence of these two environments is the disorder in tilts of oxygen octahedra and antiparallel shifts of pairs of lead ions.
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