M.M. Vijatović Petrović

• PhD
• Senior Researcher at University of Belgrade

The PPT presents a system for testing the magneto-electrical properties of flexible composite films based on barium calcium zirconium titanate (BCZT) and cobalt ferrite (CF) particles incorporate into a polyvinylidene difluoride (PVDF) i.e. (BCZT-CF/PVDF) in the next time so called COMPOSITE FILMS. BCZT-CF/PVDF are MULTIFERROIC materials; Multifer...

Ferroelectric thin films based on the polymer material polyvinylidene fluoride (PVDF) can potentially have a wide range of applications, due to the strong connection between their electrical, mechanical and thermal properties. PVDF thin films can be applied in memory devices. The most widespread application of these elements is in piezoelectric se...

In order to further improve the performance of 0.94[(Bi 0.5 Na 0.5 )TiO 3 ]‐0.06BaTiO 3 /polyvinylidene fluoride (NBT‐BT/PVDF) flexible composite films prepared by the hot‐pressing method, the effect of surface modification of the NBT‐BT particles on the structure and properties of the films was investigated. Two coupling agents, namely, (3‐aminopr...

The PPT presents the implementation of a synchronous “buck“ power converter that is used to energy harvesting from vibrating structures that oscillate in the 1Hz-1kHz range. • This range is the most common in real cases. • In addition to the frequency, a very important parameter is also the amplitude of the vibrations. • Usually, low frequencies (<...

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 energy technologies. In this paper, a series of flexible lead-free BaZr 0.2 Ti 0.8 O 3 (BZT)/PVDF and lead-based PbZr 0.52 Ti 0.48 O 3 (PZT)/PVDF pi...

U radu je predstavljen visokonaponski sistem za polarizaciju ultra tankih filmova poliviniliden fluorida (PVDF) posredstvom visokonaponske korone. PVDF je polimer sa jedinstvenim karakteristikama, kao što su piezoelektrične i feroelektrične. Perspektiva primene ovih filmova je u sistemima za sakupljanje energije iz mehaničkih vibracionih struktura...

The paper presents the realization of an experimental setup used for testing energy harvesting and storage devices based on the use of lead-free bismuth sodium titanate-barium titanate (NBT-BT) in combination with polyvinylidene fluoride (PVDF) polymer. PVDF is a polymer matrix in which piezoelectric phase is dispersed and enables formation of flex...

The paper presents the realization of an experimental setup used for testing energy harvesting and storage devices based on the use of lead-free bismuth sodium titanate-barium titanate (NBT-BT) in combination with polyvinylidene fluoride (PVDF) polymer. PVDF is a polymer matrix in which piezoelectric phase is dispersed and enables formation of flex...

Flexible multiferroic composite films are perspective materials for sensors, actuators and similar components of wearable and stretchable devices. Here we present the study of functional properties of flexible composites prepared by embedding nickel zinc ferrite and barium titanate powder into polyvinylidene fluoride (PVDF) polymer optimizing the r...

Bismuth ferrite (BiFeO3) powders were synthesized by auto-combustion method using glycine as a fuel. Doping ions of different valence were used to study the influence on electrical conductivity and ferroelectric properties. Powders were mixed and hot-pressed with α-PVDF to form flexible composite samples. Composites endured significantly higher ele...

The ferroelectric and magnetic properties of four-layered Aurivillius Bi5Ti3FeO15 (BFT) compounds via partial substitution of Bi³⁺ with Y³⁺ and Fe³⁺ with Co²⁺ (according to formula: Bi5-xYxTi3FeO15, x = 0.1, 0.2, 0.3; Bi5Ti3Fe1-yCoyO15, y = 0.1, 0.3, 0.5) were investigated. Polycrystalline ceramics of Co and Y substituted BFT were prepared by conve...

The idea of this work is finding the way to efficiently and safely use mechanical energy released in small quantities around us to power up small-scale electronic devices used in everyday life. To this purpose, flexible lead-free piezoelectric composite films were prepared by hot pressing. Different amounts (30, 35 and 40 vol%) of lead-free piezoel...

NBT-BT-PVDF flexible lead-free piezoelectric composite films were prepared by hot pressing. • Hot pressing method transforms PVDF α-phase into electro-active β and γ phases. • The dielectric permittivity: increases with the active phase amount increase in these samples up to 80. • Energy storage properties, energy density efficiency up to 75% are p...

Multiferroic composites with general formula Ba(Ti0.95Zr0.05)O3 – Ni0.7Zn0.3Fe2O4, Ba(Ti0.95Zr0.05)O3 – CoFe2O4, Ba(Ti0.95Zr0.05)O3 – Ni0.7Cu0.01Sm0.05Zn0.29Fe1.95O4, (BTZr(95–5) – NZF, BTZr(95–5) – CF, BTZr(95–5) – NCuSmZF) were prepared by mixing chemically obtained different types of ferrites and BTZ(95–5) powders in the planetary mill for 24 h....

The ferroelectric and magnetic properties of four-layered Aurivillius Bi 5 Ti 3 FeO 15 (BFT) compounds via partial substitution of Bi ³⁺ with Y ³⁺ and Fe ³⁺ with Co ²⁺ (according to formula: Bi 5 − x Y x Ti 3 FeO 15 , x = 0.1, 0.2, 0.3; Bi 5 Ti 3 Fe 1 − y Co y O 15 , y = 0.1, 0.3, 0.5) were investigated. Polycrystalline ceramics of Co and Y substit...

Multiferroic composites containing ferroelectric Ba(Ti0.80Zr0.20)O3 (BT80Zr20) phase and magnetic Ni0.7Zn0.3Fe2O4 (NZF), CoFe2O4 (CF) or Ni0.7Cu0.01Sm0.05Zn0.29Fe1.95O4 (NCuSmZF) phase were investigated in this study. Three composites, BT80Zr20-NZF, BT80Zr20-CF and BT80Zr20-NCuSmZF were prepared by mixing chemically synthesized powders in the plane...

Composites based on barium titanate and nickel zinc ferrite doped with cooper and samarium were prepared by a mixing method. The formation of barium titanate tetragonal crystal structure and nickel zinc ferrite cubic spinel structure was identified. Polygonal grains were formed in all three types of ceramics. Due to the very high conductivity of fe...

The preparation and properties of thick flexible three-phase composite films based on lead zirconium titanate (PZT) and various ferrites (nickel zinc ferrite (NZF) and cobalt ferrite (CF)) were reported in this study. Properties of three-phase composite films were compared with pure polyvinylidene fluoride (PVDF) and PZT-PVDF films. X-ray diffracti...

Samples of homogeneous (x = 0, 0.1, and 0.2) and multilayer ceramics based on solid solutions of nickel–zinc ferrites (Ni1 – xZnx)Fe2O4 with a “contrary” composition gradient (x = 0.2 → 0 → 0.2) have been prepared by the thick-film technology. The use of the two-step sintering mode enables the ceramics synthesis and the conservation of the regular–...

BaTiO3 nanopowders doped with La and co-doped with La/Mn were prepared by auto-combustion and Pechini methods, respectively. The influence of the synthesis methods, dopants and sintering temperature on the BaTiO3 structure and its potential to be used as humidity and/or H2 gas sensor were studied. The optimization of all process parameters was perf...

Ni-Zn ferrites, with the general formula Ni1-xZnxFe2O4 (x = 0.0, 0.3, 0.5, 0.7, 1.0), CoFe2O4, BaTiO3 and PbZr0.52Ti0.48O3 powders were synthesized by auto-combustion method. The composites were prepared by mixing the appropriate amounts of individual phases, pressing and conventional sintering. X-ray analysis, for individual phase and composites,...

The samples of homogeneous (x = 0; 0.1; 0.2) and multilayer ceramics with “oncoming” compositional gradient (x = 0.2→0→0.2) based on solid solutions of nickel – zinc ferrites (Ni1–xZnx) Fe2O4 have been prepared by thick-film technology. It was possible to ensure the synthesis of ceramics and to maintain inhomogeneous distribution of chemical elemen...

Comparative study of different PZT-based composite materials ((x)PbZr 0.52 Ti0.48O3+(1-x)CoFe 2O4 and (x)PbZr0.52Ti0.48O3 +(1-x)Ni0.7 Zn0.3 Fe2O4 (x=0.8 and 0.9)) is presented in the frame of structural, dielectric, ferroelectric and magnetic properties. PZT and NZF/CF powders were synthesized by auto combustion technique. The composites were synth...

Multiferroic composite materials based on antimony doped barium titanate/nickel ferrite were prepared by a mixing route. In order to obtain fine grained microstructure composite materials, pure constituent phases were prepared via chemical methods. The optimization of processing parameters has been made in order to reduce the chemical reactions at...

Di-phase ceramic composites, with general formula xNi0.7Zn0.3Fe2O4 - (1-x)BaTiO3(x = 0.9, 0.7, 0.5, 0.3, 0.1), were prepared by a mixing method. X-ray analysis, for powder and ceramics, indicated the formation of ferrite and barium titanate phases without the presence of the impurities. SEM analysis indicated that the composite morphology contained...

Conventional solid-state method was used to prepare powders of pure and barium titanate (BT) doped with different concentration of samarium. Influence of samarium addition on the structure modification, grain growth inhibition and microstructure development was studied. Dielectric properties of doped samples were significantly modified. With doping...

The effect of tungsten (W⁶⁺) doping on modification of the structure, dielectric, ferroelectric and electrical properties of BaBi4Ti4-xWxO15 (BBTWx, x = 0, 0.03, 0.05 and 0.07) was investigated. The ceramic samples were synthesized by the conventional solid state reaction method. XRD data indicated the formation of single-phase layered crystalline...

Relaxor ferroelectrics or relaxors are a class of disordered crystals possessing a peculiar structure and properties. Relaxor ferroelectrics are found in many applications in electronics such as multilayer ceramic capacitors, electro-optical devices, and medical imaging devices. It is well known that the properties of ferroelectric ceramics are ver...

Aurivillius Bi5Ti3FeO15 (BTF) and Bi5−xLaxTi3FeO15 (BLTF) ceramics were successfully synthesized by a simple solid state reaction method. The samples were characterized by X-ray diffraction with no impurity phase identified. SEM micrographs show an evident decrease of grain size of La modified ceramics in comparison with pure BTF. Dielectric proper...

Bismuth ferrite is one of the most promising multiferroic materials, and the main barriers for exploiting all of its specific properties are difficulties in obtaining pure, high resistive material with nanosized grains. Doping of BiFeO3 with different transition metals and rare earth elements is often used way for overcoming these obstacles. Yttriu...

A broadband dielectric investigation and Mössbauer studies were performed on 0.7BaTiO3–0.3NiFe2O4 composite ceramics prepared from chemically obtained barium titanate and nickel ferrite powders. Dielectric spectroscopy revealed a Debye-type relaxation at frequencies between 10 GHz and 1 THz. The relaxation time slows down on cooling according to th...

Nickel zinc ferrite (NZF) and barium titanate (BT) were prepared by auto-combustion synthesis as an effective, simple and rapid method. Multiferroic composites with the general formula yNi1-x Zn x Fe2O4-(1-y)BT (x=0.3, 0.5, 0.7, y=0.5) were prepared by mixing NZF and BT powders in a liquid medium in the ball mill. The FEG micrographs indicated the...

In this work we present detailed investigation of low frequency noise characteristics of BaTiO 3 -NiFe 2 O 4 ceramic composites of different percentage of NiFe 2 O 4 . At the particular temperatures (that gets under the broad maximum of dielectric permittivity observed around 300 K) very intensive few separate peaks of random telegraph noise signal...

Barium titanate nanopowders doped with various concentrations of antimony were synthesized by polymeric precursors method based on modified Pechini process. Obtained powders were pressed and sintered at 1,573 K for 8 h. The temperature dependence of dielectric permittivity pointed on the significant influence of added antimony on dielectric propert...

Modified Pechini process was used to prepare nanopowders of barium titanate (BT) co-doped with different concentrations of niobium and manganese. Influence of dopants on the grain growth inhibition and microstructure development was analyzed. The addition of dopants significantly influenced the dielectric properties modification. The obtained ɛ-T c...

Perovskite, single multiferroic bismuth ferrite was prepared by two chemical methods: auto-combustion and soft chemical route. Influence of different fuels and complexing agents and thermal treatment on purity of bismuth ferrite powders and density of bismuth ferrite ceramics were investigated. X-ray diffraction technique (XRD) indicated that optim...

The processing of ferroelectric BaBi4Ti4O15 (BBT) ceramics from powders prepared by conventional solid state reaction (SSR) and mechanochemical activation (MA) has been investigated. It was shown that MA synthesis reduces the synthesis temperature of BBT powders, leading to smaller particles with reduced anisotropy and consequently to smaller grain...

Nanosized nickel zinc ferrite powders with general formula Ni1−xZnxFe2O4 (x=0.0, 0.3, 0.5, 0.7, 1.0) were synthesized by an auto-combustion method starting from metal nitrates. X-ray analysis indicated the formation of well crystallized Ni–Zn ferrite phases, and Raman spectroscopy enabled a precise phases identification. The change of the grain siz...

The discovery of some Aurivillius materials with high Curie temperature or fatigue-free character suggests possible applications in high temperature piezoelectric devices or non-volatile ferroelectric random access memories. Furthermore, increasing concerns for environmental issues have promoted the study of new lead- free piezoelectric materials....

The discovery of some Aurivillius materials with high Curie temperature or fatigue-free character suggests possible applications in high temperature piezoelectric devices or non-volatile ferroelectric random access memories. Furthermore, increasing concerns for environmental issues have promoted the study of new lead-free piezoelectric materials. B...

Multiferroic composites with the general formula x BaTiO3-(1-x) NiFe2O4 (x=0.5, 0.7, 0.8) were prepared by mixing chemically obtained nickel ferrite and barium titanate powders. Optimum processing parameters for a reduction of chemical reactions at the interfaces between ferroelectric-ferrite phases were found. The presence of the nickel ferrite an...

Pure and lanthanum doped barium bismuth titanate BaBi4−xLaxTi4O15 (BBLT, x=0, 0.05, 0.15, 0.30) ceramics were prepared utilizing solid state method. The X-ray diffraction (XRD) data confirmed formation of single-phase Aurivillius compounds while SEM micrographs did not show evident grain size change of doped ceramics. Dielectric properties were inv...

Barium titanate ceramics were prepared using the nanopowder resulting from a polymeric precursor method, a type of modified Pechini process. The obtained nanopowder was observed to agglomerate and in order to de-agglomerate the powder and enhance the properties of the barium titanate the material was attrition milled. The impact of this attrition m...

Barium titanate ceramics doped with 0.3 mol.% lanthanum and co-doped with 0.3 mol.% lanthanum and 0.05 mol.% manganese were investigated. The powders were prepared by a modified polymeric precursor method based on the Pechini process. The ceramics were obtained by sintering at 1300°C for 8 h. The influence of dopants on structural changes and grain...

Antimony doped barium titanate powders were synthesized by polymeric precursors method based on modified Pechini process. Obtained powders were pressed and sintered at 1300 8C for 8 h. XRD analysis showed the formation of tetragonal crystal structure in barium titanate ceramics. The decrease of tetragonality was noticed with antimony concentration...

Barium titanate powder was prepared by soft chemical process from polymeric precursors (modified Pechini process). The synthesized barium titanate (BT) powder was nanosized and the factor of agglomeration (Fagg) pointed the existence of agglomerates. In order to de-agglomerate nanopowder and to enhance BT properties the attrition milling was perfor...

Pure and lanthanum doped barium titanate (BT) ceramics were prepared by sintering pellets at 1300 deg. C for 8 h, obtained from nanopowders synthesized by the polymeric precursor method. XRD results showed formation of a tetragonal structure. The presence of dopants changed the tetragonal structure to pseudo-cubic. The polygonal grain size was redu...

Nanopowders of pure and antimony doped barium titanate (BaTiO3-BT) were synthesized by polymeric precursors method based on Pechini process. Obtained powders were pressed and sintered at 1300°C for 8h. XRD analysis showed the formation of cubic crystal structure in all nanopowders and tetragonal in BT ceramics. The influence of antimony concentrati...

Roles of various organic crystals (OC), notably those containing nitrogen, on the preparation and properties of source materials for electroceramics are featured from the author's own experimental studies. When OC are intimately mixed with metal salts like carbonates, their decomposition is accelerated, liberating the diffusing species at temperatu...

Pure and barium titanate (BT) powders doped with different lanthanum concentration were prepared by the polymeric precursor method (Pechini process) which was carried out as a three-stage process from organometallic complexes. Sintering of pressed powders was performed at 1300°C for 2, 4 and 8h. XRD analysis showed cubic BT powders with crystallite...

Barium bismuth titanate BaBi4Ti4O15 (BBiT) ceramics have been prepared using non-conventional solid-state reaction route based on mechanochemical synthesis during intensive milling. The X-ray diffraction method was used to determine phase composition. Dielectric properties were investigated in a wide range of temperatures (20–800 °C) and frequencie...

The barium titanate (BaTiO 3) thick films were prepared by screen printing technique using powders obtained by soft chemical route, modified Pechini process. Three different barium titanate powders were prepared: i) pure, ii) doped with lanthanum and iii) doped with antimony. Pastes for screen printing were prepared using previously obtained powder...

Lanthanum and antimony doped barium titanate powders were prepared by polymeric precursors method through Pechini process. Obtained powder was pressed into pellet and sintering was performed at 1300°C for 8h. The formation of phase and crystal structure of BaTiO3 was carried out by XRD analysis, Raman and IR spectroscopy. Microstructure properties...

Pure and antimony doped barium titanate powders were prepared by polymeric precursors method through Pechini process, which was carried out as a three-stage process from organometallic complex. Obtained powder was pressed into pellets and sintering was performed at 1300 °C for 8 h with heating rate of 10 °C min-1. The formation of phase and crystal...

BaTiO3 ceramic powders were prepared by a complex method based on the Pechini type reaction route and mechanically assisted synthesis. In both ways BaTiO3 ceramics were sintered after 120 min on 1300 °C without pre-calcination steps. The crystal structure was investigated by the XRD, IR and Raman spectroscopy. The particle size and morphology of Ba...

In the present paper results of the dielectric investigation of barium titanate (BaTiO 3) doped with different concentrations of lanthanum are presented. Ceramic samples were prepared by the Pechini process. With in-creased doping the grain size of ceramics decreases from 2.5 µm in pure samples down to 0.2 µm in 0.5 mol% La -doped BaTiO 3 . Ceramic...

BaBi4Ti4O15 (BBiT) was prepared from stoichiometric amounts of BaTiO3 (BT) and Bi4Ti3O12 (BIT) obtained via mechanochemical synthesis. Mechanochemical synthesis was performed in air atmosphere in a planetary ball mill. BBiT ceramics were sintered at 1100°C, 1110°C and 1120°C for 1 h without pre-calcination step. The formation of phase and crystal s...

Barium titanate, BaTiO3 ceramic powders were prepared by mechanochemical synthesis and by the Pechini method. A powder mixture of BaO and TiO2 was treated in a planetary ball mill in an air atmosphere for up to 1 h, using zirconium oxide vial and zirconium oxide balls as the milling medium. After 60 min BaTiO3 phase was formed. In both ways BaTiO 3...

In the present paper the results of new ceramics of BaTiO3 with 0,5 mol% antimony were investigated by means of dielectric spectroscopy. Dielectric spectra of barium titanate with 0,5 mol% antimony revealed three parts: low frequency part which is caused by conductivity process, middle frequency part where the dielectric dispersion is nearly Debye...

Bi₄Ti₄O₁₅ [BBT], a member of Aurivillius bismuth-based layer-structure perovskites, was prepared from stoichiometric amounts of BaTiO₃ [BT] and Bi₄Ti₃O₁₂ [BIT] obtained via mechanochemical synthesis. Mechanochemical synthesis was performed in air atmosphere i...

The dielectric permittivity and dissipation factor of La-doped and undoped BaTiO3 were investigated as a function of frequency and temperature. The impedance response was used to study the electrical properties of La-doped BaTiO3 over the temperature range from room temperature (RT) to 350°C. La-doped and undoped BaTiO3, obtained by a modified Pech...

Barium titanate (BaTiO3) has been of practical interest for more than 60 years because of its attractive properties. BaTiO3 can be prepared using different methods, which can have significant influence on the structure and properties of barium titanate ceramics. In this paper powder of BaTiO3 powders were prepared by two methods. The first was synt...

Barium titanate is the first ferroelectric ceramics and a good candidate for a variety of applications due to its excellent dielectric, ferroelectric and piezoelectric properties. Barium titanate is a member of a large family of compounds with the general formula ABO3 called perovskites. Barium titanate can be prepared using different methods. The...

Barium titanate is the first ferroelectric ceramics and a good candidate for a variety of applications due to its excellent dielectric, ferroelectric and piezoelectric properties. Barium titanate is a member of a large family of compounds with the general formula ABO3 which is called perovskite. Barium titanate can be prepared using different metho...

The gap between the bulk materials and thin films can be filled with thick films suitably designed and appropriate processed. Thick films of complex system like lead–lanthanum–zirconium titanate (PLZT) is difficult to produce by simple solid-state reaction keeping compositional homogeneity and optimal grain size distribution. In the present work, P...