A5007349625- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Dielectric properties of ceramics
- Acoustic Wave Resonator Technologies
- Solid-state spectroscopy and crystallography
- Perovskite Materials and Applications
- Glass properties and applications
- Dielectric materials and actuators
- Electromagnetic wave absorption materials
- Material Dynamics and Properties
- X-ray Diffraction in Crystallography
- Electronic and Structural Properties of Oxides
- Microwave and Dielectric Measurement Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Photorefractive and Nonlinear Optics
- Crystal Structures and Properties
- Advanced Sensor and Energy Harvesting Materials
- Force Microscopy Techniques and Applications
- Conducting polymers and applications
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Optical properties and cooling technologies in crystalline materials
- Theoretical and Computational Physics
- Thermal Expansion and Ionic Conductivity
Vilnius University
2015-2024
Yonsei University
2021
AGH University of Krakow
2021
Thomas Young Centre
2021
Polish Academy of Sciences
2021
Wrocław University of Science and Technology
2021
Imperial College London
2021
Instituto de Ciencia de Materiales de Madrid
2018
Center for Physical Sciences and Technology
2011
Abstract Cation engineering provides a route to control the structure and properties of hybrid halide perovskites, which has resulted in highest performance solar cells based on mixtures Cs, methylammonium, formamidinium. Here, we present multi-technique experimental theoretical study structural phase transitions, phases dipolar dynamics mixed methylammonium/dimethylammonium MA 1- x DMA PbBr 3 perovskites (0 ≤ 1). Our results demonstrate significant suppression enhanced disorder...
Mixing molecular cations in hybrid lead halide perovskites is a highly effective approach to enhance the stability and performance of optoelectronic devices based on these compounds. In this work, we prepare study novel mixed 3D methylammonium (MA)-ethylammonium (EA) MA
Barium titanate ceramics doped with 0.3 mol.% lanthanum and co-doped 0.05 manganese were investigated.The powders prepared by a modied polymeric precursor method based on the Pechini process.The obtained sintering at 1300 • C for 8 h.The inuence of dopants structural changes grain size reduction was analyzed.The presence inuenced tetragonality barium crystal structure.Reduction polygonal dopant addition noticed.In ceramics, characteristic phase transitions shifted to lower temperatures in...
A series of novel CoFe2O4 – xBaTiO3 (x = 0.6–0.9) phosphate-bonded multifunctional ceramic composites were synthesized and studied both in 'Salisbury screen' geometry as free-standing films the frequency range 25–54 GHz temperature interval 120–500 K. Experiments prove that system is prospective for shielding applications modes providing total transmission losses sample layer 40 dB x 0.9 dominated by absorption more than reflection at resonant conditions Salisbury screen geometry. It was...
Mixed ${\text{CuInP}}_{2}{({\text{S}}_{x}{\text{Se}}_{1\ensuremath{-}x})}_{6}$ crystals were investigated by broadband dielectric spectroscopy (20 Hz--3 GHz). The complete phase diagram has been obtained. of is strongly asymmetric---the decreasing ferroelectric phase-transition temperatures in much more flat with small admixture sulfur than selenium. In the middle part $(x=0.4--0.9)$ dipolar glass observed. boundary region between order and disorder amount $(x=0.2--0.25)$ at low...
Mixing of molecular cations enhances the optoelectronic properties and stability hybrid lead halide perovskites. Here, we use a multitechnique approach to determine phase diagram cation dynamics mixed methylammonium-formamidinium MA1–xFAxPbBr3 (0 ≤ x 1) The calorimetric, ultrasonic, X-ray diffraction experiments show substantial suppression structural transitions stabilization cubic upon mixing. We broad-band dielectric Raman spectroscopies study MA FA in these compounds. spectroscopy...
Coherent neutron powder diffraction experiments were carried out together with specific heat, dilatometry, and dielectric spectroscopy studies on Li2B4O7 enriched B11 isotope to 99.3% at low temperatures. Neither traces of phase transformations nor discontinuous changes in physical properties observed. Negative thermal expansion, anomalous behavior selected interatomic distances/angles, isotropic displacement parameters sites as well constant discussed terms dynamic lithium disorder.
Abstract The preparation and properties of thick flexible three-phase composite films based on lead zirconium titanate (PZT) various ferrites (nickel zinc ferrite (NZF) cobalt (CF)) were reported in this study. Properties compared with pure polyvinylidene fluoride (PVDF) PZT–PVDF films. X-ray diffraction data indicated the formation well crystallized structure PZT NZF/CF phases, without presence undesirable phases. Scanning electron micrographs showed that ceramic particles dispersed...
For the last several decades, energy harvesters based on piezoelectricity from mechanical vibration have emerged as very promising devices that are being explored extensively for their functionality in technologies. In this paper, a series of flexible lead-free BaZr0.2Ti0.8O3 (BZT)/PVDF and lead-based PbZr0.52Ti0.48O3 (PZT)/PVDF piezocomposites with variable filler content up to 50 vol% were prepared by hot pressing method. The structure morphology BZT PZT powders, well distribution...
The full-wave analysis was applied for a coaxial line (i.e., transmission line) that has “short-circuited” discontinuity. discontinuity radius less than or equal to the inner of line. “sample region” can be considered as partially filled circular waveguide. Such structure is very practical and particular interest dielectric spectroscopy applications. It takes into account inhomogeneous field distribution, which limiting factor determination high permittivity values at microwave frequencies....
In the present work, we demonstrate that incorporating UiO-66 and UiO-66-NH 2 MOF particles into PEBA polymer increases triboelectric surface charge density enables control of polarity by using MOFs with modified linkers.
In this contribution we present calculations, which allow extending measurement range compared with the previous formalisms. model is accounted not only no homogeneous distribution of electromagnetic field in sample, but also additional modes, generate vicinity sample dynamical capacitor. The examples measurements relaxor ceramics presented frequency 10 MHz−3 GHz and between two different methods. As it shown method allows to measure more precisely at higher frequencies, especially...
Remarkable gas adsorption properties of zeolitic imidazolate frameworks (ZIFs) are believed to be tightly related a flexible nature organic linkers in these compounds. We present low-frequency dielectric spectroscopy study dynamic effects ZIF-90 hybrid compound. Experiments dehydrated framework reveal slow motion the imidazolate-2-carboxyaldehyde linker kilohertz frequency range. Measurements hydrated compound indicate two additional processes adsorbed water molecules. These assigned proton...
Abstract In the present publication we report results of dielectric spectroscopy investigations two classes materials – relaxor and dipolar glasses. As model was chosen (Pb 1–x La x )(Zr y Ti 1–y )O 3 (PLZT 100(x/y/1–y)). The real distribution function relaxation times f ( τ ) ferroelectric ceramics PLZT 8/65/35 9.5/65/35 calculated from measurements in wide frequency range (10 1 –10 12 Hz). Below Burns temperature T B ≅ 620 K, when clusters begin to appear on cooling, is symmetrically...
PbMg1/3Nb2/3O3 (PMN) is a well known ferroelectric relaxor. PMN crystal doped with La3+ has greatly enlarged chemically ordered regions (CORs) in the structure. It interesting to know how development of CORs influences physical properties crystal. In this work, dielectric and distribution relaxation times 0.98Pb(Mg1/3Nb2/3)O3–0.02La(Mg2/3Nb1/3)O3 (PLMN) crystals are studied. The experiment was performed 120–500 K temperature range wide frequency range—up 46 GHz. results demonstrate that...
The complex dielectric susceptibility of ${\mathrm{Sr}}_{0.61}{\mathrm{Ba}}_{0.39}{\mathrm{Nb}}_{2}{\mathrm{O}}_{6}:\mathrm{Co}$ has been measured at frequencies ${10}^{1}\ensuremath{\leqslant}f\ensuremath{\leqslant}{10}^{9}\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}$ and temperatures $300\ensuremath{\leqslant}T\ensuremath{\leqslant}400\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ before after poling. high-frequency relaxation peak observed above the ferroelectric phase transition temperature,...