This section collects all the official material created during the TransFerrr project as well as the publications that disseminate the results achieved by the project. If you are interested in communicating about TransFerr project get in contact with our dissemination manager Katarzyna Lenczewska (

Piezoelectric domain walls in van der Waals antiferroelectric CuInP2Se6 – Article 33

Abstract: Polar van der Waals chalcogenophosphates exhibit unique properties, such as negative electrostriction and multi-well ferrielectricity, and enable combining dielectric and 2D electronic materials. Using low temperature piezoresponse force microscopy, we revealed coexistence of piezoelectric and non-piezoelectric phases in CuInP2Se6, forming unusual domain walls with enhanced piezoelectric response. From systematic [...]

Nanoscale ferroelectricity in pseudo-cubic sol-gel derived barium titanate – bismuth ferrite (BaTiO3 – BiFeO3) solid solutions – Article 28

Abstract: Single phase barium titanate–bismuth ferrite ((1-x)BaTiO3-(x)BiFeO3, BTO-BFO) solid solutions were prepared using citric acid and ethylene glycol assisted sol-gel synthesis method. Depending on the dopant content the samples are characterized by tetragonal, tetragonal-pseudocubic, pseudocubic and rhombohedral structure as confirmed by Raman spectroscopy and XRD measurements. An increase of the [...]

Structural Properties of BiFeO3 and Bi0,9La0,1FeO3 Powders Synthesized by Sol-Gel Process – Article 25

Abstract: The present work aims to design and study novel functional materials with multiferroic properties required in electric applications, such as magnetic and magnetoresistive sensors, actuators, microwave electronic devices, phase shifters, mechanical actuators etc. Complex oxides BiFeO3 and Bi0,9La0,1FeO3 for analysis of its structural properties were synthesized as powders by sol-gel method. [...]

Analytical description of the size effect on pyroelectric and electrocaloric properties of ferroelectric nanoparticles – Article 23

Abstract: Using Landau-Ginzburg-Devonshire theory and effective medium approximation, we analytically calculate typical dependences of the pyroelectric and electrocaloric coefficients on external electric field, temperature, and radius of spherical single-domain ferroelectric nanoparticles. The considered physical model corresponds to the nanocomposite with a small fraction of ferroelectric nanoparticles. Within the framework of [...]

Mapping gradient-driven morphological phase transition at the conductive domain walls of strained multiferroic films – Article 22

Abstract: The coupling between antiferrodistortion (AFD) and ferroelectric (FE) polarization, universal for all tilted perovskite multiferroics, is known to strongly correlate with domain wall functionalities in the materials. The intrinsic mechanisms of domain wall phenomena, especially AFD-FE coupling-induced phenomena at the domain walls, have continued to intrigue the scientific and [...]

Ferromagnetic-like behavior of Bi0.9La0.1FeO3–KBr nanocomposites – Article 20

Abstract: We studied magnetostatic response of the Bi0.9La0.1FeO3– KBr composites (BLFO-KBr) consisting of nanosized (≈100 nm) ferrite Bi0.9La0.1FeO3 (BLFO) conjugated with fine grinded ionic conducting KBr. When the fraction of KBr is rather small (less than 15 wt%) the magnetic response of the composite is very weak and similar to that observed for [...]

Building Free Energy Functional from Atomically-Resolved Imaging: Atomic Scale Phenomena in La-doped BiFeO3 – Article 18

Abstract: Scanning transmission electron microscopy (STEM) has enabled mapping of atomic structures of solids with sub-picometer precision, providing insight to the physics of ferroic phenomena and chemical expansion. However, only a subset of information is available, due to projective nature of imaging in the beam direction. Correspondingly, the analysis often [...]

A-site ordered state in manganites with perovskite-like structure based on the optimally doped compounds Ln0.70Ba0.30MnO3 (Ln = Pr, Nd) – Article 17

Abstract: In this paper, we report on the crystal structure and magnetic properties of the nanostructured Ba-ordered phases of rare-earth manganites obtained from the optimally doped solid solutions Ln0.70Ba0.30MnO3 (Ln = Pr, Nd). The materials were studied by X- ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and SQUID- magnetometry techniques. [...]

Size effect of soft phonon dispersion in nanosized ferroics – Article 16

Abstract: Using Landau-Ginsburg-Devonshire theory, we derive and analyze analytical expressions for the frequency dispersion of soft phonon modes in nanosized ferroics and perform numerical calculations for a thin SrTiO3 film. We revealed the pronounced “true” size effect in the dependence of soft phonon spatial dispersion on the film thickness and predict that [...]

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