D.V. Karpinsky

D.V. Karpinsky
Scientific-Practical Materials Research Centre of NAS of Belarus · Laboratory of non-metallic ferromagnets

PhD

About

178
Publications
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2,243
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Publications

Publications (178)
Article
Single-phase samples of the Bi0.85Ca0.15Fe1-xMnxO3 (0.1≤x≤0.5) perovskites have been prepared by a solid state reaction method and investigated using X-ray and neutron diffraction, scanning electron microscopy, piezoresponse force microscopy, magnetization, and ac susceptibility measurements. It has been found that the increase in Mn concentration...
Preprint
Full-text available
Sm-doped BiFeO3 compacted powders with composition across the morphotropic phase boundary region were prepared by sol-gel method. Crystal structure, morphology and magnetic state of the compounds were analyzed as a function of dopant concentration, temperature and external pressure using synchrotron and laboratory X-ray diffraction, electron micros...
Article
Sm-doped BiFeO3 compacted powders with composition across the morphotropic phase boundary region were prepared by sol-gel method. Crystal structure, morphology and magnetic state of the compounds were analyzed as a function of dopant concentration, temperature and external pressure using synchrotron and laboratory X-ray diffraction, electron micros...
Article
Tm³⁺:KY(WO4)2 (KYW) single crystals were grown by the modified Czochralski method. The factors affecting the crystallization processes are studied focusing on optimization of crystallization mode and improving of crystals qualitative parameters. Laser-related spectroscopic properties of Tm³⁺:KYW crystal, absorption and luminescence spectra as well...
Article
Magnetic properties of the phase-separated (antiferromagnetic + glassy) Bi0·85Ca0·15Fe0·6Mn0·4O3 multiferroic have been studied over a wide temperature range. It has been found that the material exhibits a metamagnetic transition (shifting toward smaller fields with decreasing temperature) which is accompanied by the magnetization jumps whose value...
Preprint
A correlation between the crystal structure and magnetic properties of system (1-x)BiFeO$_3$-(x)BaTiO$_3$ with compounds across the morphotropic phase boundary was studied using X-ray and neutron diffraction, magnetometry, and Mossbauer spectroscopy measurements. Increase in the dopants content leads to the structural transition from the rhombohedr...
Article
A correlation between the crystal structure and magnetic properties of system (1-x)BiFeO3 – (x)BaTiO3 with compounds across the morphotropic phase boundary was studied using X-ray and neutron diffraction, magnetometry, and Mössbauer spectroscopy measurements. Increase in the dopants content leads to the structural transition from the rhombohedral p...
Preprint
Samarium substituted bismuth ferrite (BiFeO3) ceramics prepared by sol-gel synthesis method were studied using both local scale and microscopic measurement techniques in order to clarify an evolution of the crystal structure of the compounds across the morphotropic phase boundary region. X-ray diffraction analysis, transmission and scanning electro...
Article
Samarium substituted bismuth ferrite (BiFeO3) ceramics prepared by sol-gel synthesis method were studied using both local scale and microscopic measurement techniques in order to clarify an evolution of the crystal structure of the compounds across the morphotropic phase boundary region. X-ray diffraction analysis, transmission and scanning electro...
Preprint
The physical nature of the ferroelectric (FE), ferrielectric (FEI) and antiferroelectric (AFE) phases, their coexistence and spatial modulation encountered in antiferrodistortive multiferroics was poorly studied. Using Landau-Ginzburg-Devonshire (LGD) phenomenology and semi-microscopic four sublattice model (FSM) this work predicts the emergence an...
Article
Full-text available
Ordering of mobile defects in functional materials can give rise to fundamentally new phases possessing ferroic and multiferroic functionalities. Here we develop the Landau theory for strain induced ordering of defects (e.g. oxygen vacancies) in thin oxide films, considering both the ordering and wavelength of possible instabilities. Using derived...
Preprint
Single phase barium titanate-bismuth ferrite ((1-x)BaTi$_3$-(x)BiFe$_3$, 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 spe...
Preprint
Samarium doped BiFeO3 compounds having nano-size crystallites were prepared by the ethylene glycol assisted sol-gel synthesis method. X-ray diffraction and SEM measurements as well as Raman spectroscopy and FTIR experiments were used to clarify the evolution of the crystal structure on microscopic and local scale levels in the compounds having form...
Article
Evolution of the crystal structure and magnetic properties of Sm-doped BiFeO 3 ceramics across the phase boundary region, Ceramics International (2020), doi: https:// Abstract Samarium doped BiFeO 3 compounds having nano-size crystallites were prepared by the ethylene glycol assisted sol-gel synthesis method. X-ray diffraction and SEM measurements...
Article
Full-text available
In this study, a highly crystalline bismuth ferrite (BFO) powder was synthesized using a novel, very simple, and cost-effective synthetic approach. It was demonstrated that the optimal annealing temperature for the preparation of highly-pure BFO is 650 °C. At lower or higher temperatures, the formation of neighboring crystal phases was observed. Th...
Article
Neutron diffraction and magnetization measurements of the Bi0.85Ca0.15Fe1-xMnxO3+δ (x = 0.4, 0.5) compounds have been performed at room and low temperatures to disclose the effect of the mixed-valence Mn substitution on the magnetic structure and properties of the Ca-doped bismuth ferrites near the polar/nonpolar phase boundary. It has been confirm...
Article
Full-text available
In this work we demonstrate the role of grain boundaries and domain walls in the local transport properties of n-and p-doped bismuth ferrites, including the influence of these singularities on the space charge imbalance of the energy band structure. This is mainly due to the charge accumulation at domain walls, which is recognized as the main mecha...
Article
Solid state synthesis and investigation of the crystal/magnetic structure and magnetic properties of the Bi1‐xCaxFe0.6Mn0.4O3+δ [x=0.1, 0.15; δ=0.02(2)] multiferroics have been carried out to explore an approach to designing ferroelectric materials with the enhanced magnetization attributed to the ferromagnetic superexchange involving the Mn 3d sta...
Article
Full-text available
Evolution of the crystal structure of ceramics BiFeO3–BaTiO3 across the morphotropic phase boundary was analyzed using the results of macroscopic measuring techniques such as X-ray diffraction, differential scanning calorimetry, and differential thermal analysis, as well as the data obtained by local scale methods of scanning probe microscopy. The...
Article
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 spectro...
Article
The room- and low-temperature neutron diffraction measurements of the Bi0.9Ca0.1Fe0.6Mn0.4O3+δ compound have been carried out to disclose the influence of Mn substitution on the multiferroic properties of the low-doped Bi1−xCaxFeO3−x/2 perovskites combining ferroelectric and weak ferromagnetic behavior. It has been proven that the material under st...
Article
Full-text available
The unprecedented attributes such as biocompatibility and flexibility of macromolecular piezoelectric polymer has triggered an immense interested in scientific society for their potential exploitation in implantable electronic devices. In the present article, a theoretical and experimental investigation is done to explore the polarization behavior...
Article
Full-text available
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 the BLF...
Article
Herein, we report on the crystal structure, magnetic and local ferroelectric properties of the Bi1−xCaxFe1−xTixO3 and Bi1−xCaxFe1−x/2Nbx/2O3 perovskites prepared by a solid state reaction method. It has been found that the Ca²⁺/Nb⁵⁺-containing series is characterized by a narrower concentration range (x ≤ 0.2) over which the acentric R3c structure...
Article
The structural parameters of the Bi0.85AE0.15Fe0.85Ti0.15O3 (AE = Ca and Ba) multiferroics have been determined using variable temperature neutron powder diffraction. The compounds adopt the polar rhombohedral R3c structure near room temperature and undergo phase transitions into either the nonpolar orthorhombic Pnma (AE = Ca) or cubic Pm3-m (AE =...
Article
Crystal structure of the Bi1-xBaxFe1-xTixO3 ceramics across the phase boundary region between the polar rhombohedral and pseudo-cubic phases has been investigated by means of X-ray and neutron diffraction, scanning electron microscopy and differential scanning calorimetry techniques. The structural measurements have revealed a decrease in the rhomb...
Article
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-magnetome...
Article
Having been considered as materials of exceptional technological importance, magnetoelectric multiferroics continue to attract tremendous research interest. While the steady progress achieved in this field over the past decades has made our understanding of underlying physics substantially exhaustive and deep, some topics still remain to be debated...
Article
Full-text available
In this research paper, we utilized the traditional high-temperature solid-state reaction method to fabricate the K0.495Na0.520NbO3, K0.480Na0.535NbO3 and K0.475Na0.540NbO3 (abbreviated as KNN-1, KNN-2, and KNN-3, respectively) lead-free ion deficient ceramics for understanding the influence of ionic deficiency on the crystalline structure and diel...
Article
Novel composites based on polymer ferroelectrics with graphene (G) and graphene oxide (GO) have many advantages over pristine materials. In this work, the results of the computational molecular modeling of the composite nanostructures are presented and analyzed. The calculations were focused on pyroelectric properties of the composites based on pol...
Article
Full-text available
Stress-induced local polarization reversal was studied in La doped BiFeO3 ceramics under the action of Berkovich-type prism indentation. Piezoresponse force microscopy was used for detailed study of domain structure before and after local polarization reversal. Two mechanisms of domain formation under the action of the mechanical loading were revea...
Preprint
We studied magnetostatic response of the Bi0.9La0.1FeO3-KBr composites (BLFO-KBr) consisting of nanosized (about 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 percent) the magnetic response of the composite is very weak and similar to that observed...
Article
The crystal structures of Bi1 – xPrxFeO3 solid solutions in the vicinity of the transition from the polar rhombohedral phase to the nonpolar orthorhombic phase have been analyzed by X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. These methods made it possible to reveal the specific features of the change...
Article
The influence of rotomagnetic (RM), rotoelectric (RE) and magnetoelectric (ME) coupling on phase diagram and properties of antiferrodistortive (AFD) perovskite oxides was reviewed. The main examples we consider in the review are typical AFD perovskites, such as incipient ferroelectrics EuTiO3, SrTiO3, EuxSr1-xTiO3, multiferroic BiFeO3 and Bi1-xRxFe...
Article
Compositional and temperature evolution of crystal structure and magnetic properties of the BiFeO3-based compounds co-doped with Ca and transition metal ions - Mn, Ti or Nb was studied with X-ray diffraction and vibrating sample magnetometer techniques. It has been shown that the chemical substitution allows to vary structural parameters, thus modi...
Article
In this paper, we report on the crystal structure, magnetic and local ferroelectric properties of the Bi1−xCaxFe1−x/2Nbx/2O3 (x ≤ 0.2) compounds prepared by a solid state reaction method. The chemical substitution has been found to reduce the polar ionic displacements in the acentric R3c structure and give rise to the formation of the non-polar Pnm...
Article
The pyroelectric properties of polyvinylidene fluoride/trifluoroethylene doped with graphene oxide were studied. The pyroelectric current measurements were performed for polarized and non-polarized samples with different amount graphene oxide: 5, 10, 15, 20, 25%. The polarization process influence on pyroelectric current was discussed. Moreover the...
Article
The evolution of crystal structure and piezoelectric properties of the Bi1-xSmxFeO3 ceramics with compositions corresponding to the phase boundary region between the polar rhombohedral and anti-polar orthorhombic phases have been studied. The materials have been investigated using X-ray diffraction, transmission electron microscopy and piezorespons...
Article
Local electromechanical (EM) measurements were performed in Pr doped BiFeO3 (BPFO) ceramics via piezoresponse force microscopy (PFM). The results revealed that local EM response was different from the macroscopic one due to the large contribution of the leakage current. The locally measured response was used to evaluate effective piezoelectric coef...
Article
Having been considered as a prime example of a room-temperature magnetoelectric multiferroic, BiFeO3 continues to attract much interest. Since functional properties of this material can be effectively influenced by chemical, electrical, magnetic, mechanical and thermal stimuli, it can serve as a model for the investigation of cross-coupling phenome...
Article
Using Landau-Ginzburg-Devonshire (LGD) theory for BiFeO3 dense fine grained ceramics with quasi spherical grains and nanosized inter grain spaces enriched by elastic defects, we calculated a surprisingly strong size-induced increase of the AFM temperature caused by the joint action of rotomagnetic and magnetostrictive coupling. Notably that all par...
Article
Spin transitions of cobalt ions in LaCoO3 single crystals have been studied by the method of X-ray magnetic circular dichroism (XMCD) at the K- and L2,3-edges of Co³⁺ ions. The orbital momentum of cobalt ions obtained for the K-edge at the 3d level in the region of the spin transition in the temperature range from 25 to 120 K increases by a factor...
Article
In the review we briefly analyze the state-of-art in the theory of flexoelectric phenomena and analyze how significantly the flexoelectric coupling can change the polar order parameter distribution in different ferroics and liquid crystals. The special attention in paid to the appearance of the spatially modulated phases induced by the flexocouplin...
Article
The role of superexchange interaction in the formation of the ferromagnetic state of cobaltites in the La0.5Sr0.5Co1–xMexO3 (Me = Cr, Ga, Fe) systems and manganites La0.7Sr0.3Mn0.85M0.15O3 (M–Nb, Mg) with a perovskite structure has been studied. It was found that the ferromagnetic state in cobaltites can be implemented in some compositions without...
Article
In the review we briefly analyze the state-of-art in the theory of flexoelectric phenomena and analyze how significantly the flexoelectric coupling can change the polar order parameter distribution in different ferroics and liquid crystals. The special attention in paid to the appearance of the spatially modulated phases induced by the flexocouplin...
Article
Magnetic ferroelectrics continue to attract much attention as promising multifunctional materials. Among them, BiFeO3 is distinguished by exceptionally high transition temperatures and, thus, is considered as a prototype room-temperature multiferroic. Since its properties are known to be strongly affected by chemical substitution, recognition of th...
Article
The crystal structure and magnetic properties of polycrystalline compounds La0.7Sr0.3Mn1−x Nix O3 (x ≤ 0.37) were studied by neutron powder diffraction and magnetometry measurements, and the magnetotransport properties were also investigated, focusing on the magnetic state of the compounds. The crystal structure of the compounds remains rhombohedra...
Article
La1-xSrxMn0.5S(cyrillic)o0.5O3 (x ≤ 0.75) perovskites have been studied as a function of temperature by neutron powder diffraction (NPD), magnetization and magnetoresistance measurements. The NPD data show that x = 0.15 and 0.5 compounds are stoichiometric, so the Sr²⁺ doping transforms Co²⁺ ions into the Co³⁺ ones, whereas manganese ions remain in...
Article
Full-text available
Crystal structure of the Bi1−xPrxFeO3 ceramics of the compositions corresponding to the threshold concentrations separating the polar rhombohedral (R3c) and anti-polar orthorhombic (Pbam) phases has been investigated with X-ray diffraction, transmission electron microscopy and differential scanning calorimetry measurements performed in a broad temp...
Article
Ceramics samples of La1-xSrxMn0.5Ni0.5O3 (0 ≤ x ≤ 0.2) with perovskite structure have been studied by neutron diffraction method, magnetometry and magnetoresistance measurements. Structural data testify a partial order of the Ni and Mn ions in all the compounds in spite of chemical substitution of the La³⁺ ions by Sr²⁺ ones and an increase of the o...
Article
The compositions La0.7Sr0.3Mn1 – xCoxO3 (0.13 ≤ x ≤ 1) are studied by neutron diffraction, magnetometry, and measuring the magnetotransport properties. The substitution of cobalt ions for manganese ions is shown to decrease the magnetization and the Curie temperature from 270 K (x = 0.13) to 140 K (x = 0.33). As the cobalt ion content increases to...
Article
For advanced applications in modern industry it is very important to reduce the volume of ferroelectric nanoparticles without serious deterioration of their polar properties. We show the size effects of ferroelectric polarization and phase diagrams of semi ellipsoidal BiFeO3 nanoparticles with three different semi axes and fixed volume V. The shape...
Article
A combined diffraction and EXAFS study of LaCoO3 and La0.5Sr0.5Co0.75Nb0.25O3 powders — CORRIGENDUM - E. A. Efimova, V. V. Sikolenko, D. V. Karpinsky, I. O. Troyanchuk, S. Pascarelli, C. Ritter, M. Feygenson, S. I. Tiutiunnikov, V. Efimov
Article
Magnetic and magnetotransport properties of La0.7Sr0.3Mn1-xCoxO3 ceramics have been investigated by neutron powder diffraction, magnetization and electrical measurements. It is shown that substitution by cobalt ions leads to a decrease of magnetic transition temperature down to 140 K for the compound with x=0.33. The compounds with cobalt content 0...
Article
Full-text available
We construct a Landau-Ginzburg thermodynamic potential, and the corresponding phase diagram for pristine and slightly doped bismuth ferrite, a ferroelectric antiferromagnet at room temperature. The potential is developed based on new X-ray and neutron diffraction experiments complementing available data. We demonstrate that a strong biquadratic ant...
Article
The samples of polyvinylidene fluoride/trifluoroethylene with different amount of graphene oxide dopant 5, 10, 15, 20 and 25% were fabricated and their phase situation were estimated. Moreover the para–ferroelectric phase transition was studied using the dielectric spectroscopy technique. The results of dielectric measurements allowed to perform Co...
Article
Inspired by the potential applications of magnetoelectric effect, the interest in multiferroic materials grows steadily. While BiFeO3 is the most thoroughly studied magnetic ferroelectric, the properties of its solid solutions remain a matter of intensive debate. In this paper we show how variation in the chemical composition of the Bi1-xAexFe1-xTi...
Article
Molecular modeling of ferroelectric composites containing polyvinylidene fluoride (PVDF) and either graphene (G) or graphene oxide (GO) were performed using the semi-empirical quantum approximation PM3 in HyperChem. The piezo properties of the composites were analyzed and compared with experimental data obtained for P(VDF-TrFE)-GO films. Qualitativ...
Article
We perform computational molecular modeling of graphene/graphene oxide (G/GO) and polyvinylidene fluoride (PVDF) ferroelectric polymer composite nanostructures, using semi-empirical quantum approximation PM3 in HyperChem. Piezoelectric properties of these nanostructures are analyzed in comparison with experimental data obtained for poly(vinylidene...
Article
A combination of neutron diffraction, synchrotron X-ray diffraction, and high-resolution extended X-ray absorption fine structure measurements has been used to clarify the correlations between long- and local-range structural distortions across the spin-state transition in powders of LaCoO 3 and La 0.5 Sr 0.5 Co 0.75 Nb 0.25 O 3 . The analysis of t...
Article
Recently, many organic materials, including carbon materials such as carbon nanotubes (CNTs) and graphene (single-walled carbon sheet structure) were studied in order to improve their mechanical and electrical properties. In particular, copolymers of poly (vinylidene fluoride) and poly trifluoroethylene [P(VDF-TrFE)] are promising materials, which...
Article
Bismuth ferrite (BiFeO3) is one of the most promising multiferroics with a sufficiently high ferroelectric (FE) and antiferromagnetic transition temperatures, and magnetoelectric (ME) coupling coefficient at room temperature, and thus it is highly sensitive to the impact of cross-influence of applied electric and magnetic fields. According to the u...
Conference Paper
The evolution of crystal structure and piezoelectric properties of the Bi 1−x Sm x FeO 3 ceramics across the rhombohedral-orthorhombic phase boundary (0.1 < x < 0.15) is studied. Piezoresponse force microscopy measurements have been used to attest ferroelectric properties of the compounds. PFM data have testified a decrease of piezoresponse for the...
Chapter
Ceramic samples of La1-xSrxMn0.5Ni(Co)0.5O3 with perovskite structure are considered to be promising functional materials due to their intriguing magnetic and magnetoresistive properties. Physical properties of these compounds dependent on their structural parameters and electron configuration of the related transition metal ions. These compounds h...
Chapter
Spin coating technique was employed to obtain thin films of Poly(vinylidene fluoride-trifluoroethylene)-Graphene oxide (P(VDF-TrFE) - GO) composite with different concentration of GO (0, 1 and 2 wt%) with a nominal thickness in the range of 0.50-0.55 µm. Experimental and theoretical investigation of the piezoelectric/ferroelectric behavior of P(VDF...
Article
Full-text available
Crystal structure and magnetic properties of BiFeO3 compounds co-doped with Ca and Mn ions as well as Ca and Ti ones were studied using diffraction and magnetometry techniques. Crystal structure of the Bi1−xCaxFe1−xMnxO3 ceramics with x < 0.19 was attested to be single phase rhombohedral one, structural data obtained for the compounds co-doped with...
Article
Anion-deficient La0.5Ba0.5CoO2.8 and Y0.25Ca0.25Sr0.5CoO2.62 cobaltites are studied under pressures up to 6.5 GPa in the temperature range of 5−300 K by neutron powder diffraction. Under ambient pressure both compounds are antiferromagnetic with TN = 250 K. The applied pressure induces in the first compound a gradual transition from the antiferroma...
Article
Crystal and magnetic structure of Bi1−xCaxFe1−xMnxO3 (x ≤ 0.3) multiferroics have been studied by X-ray and neutron powder diffraction as well as magnetometry techniques. It was shown that polar rhombohedral phase specific for the compounds with x ≤ 0.19 transforms to the nonpolar orthorhombic one through very narrow (∼1% on concentration) two phas...
Article
The crystal structure and the magnetic properties of multiferroics Bi1?xCaxFe1?xMnxO3 (x ? 0.22) have been studied. It has been found that the stoichiometric compositions undergo a crystal-structure transformation from the rhombohedral (space group R3c) polar phase (x ? 0.18) to the orthorhombic (space group Pnma) nonpolar phase (x ? 0.20) via a tw...
Article
The crystal structure and piezoelectric and magnetic properties have been studied in Bi1‒xSmxFeO3 solid solutions with the compositions near the morphotropic boundary between rhombohedral and orthorhombic (Rh–Orh) phases. The coexistence areas of rhombohedral and antipolar orthorhombic phases, as well as the evolution of structural phases at the in...