Ferroelectric ceramics (BaTiO3_MnO2) with different Mn admixtures were prepared using solid-state synthesis. Elemental analysis, powder X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and impedance spectroscopy confirmed that the BaTiO3 MnO2 coexisted in ceramics. In addition, high purity homogeneity of element distributions ceramic samples confirmed. The adsorptive photocatalytic properties (reference sample, BTO) BaTiO3_MnO2 materials (BTO_x, where...

The differences between the physical properties of barium titanate BaTiO3 and newly obtained BaHfxTi1-xO3 were identified. These ceramics prepared by solid-phase reaction from simple oxides carbonates using conventional method. structure morphology investigated samples characterised X-ray diffraction (XRD) scanning electron microscopy (SEM). application impedance spectroscopy made possible to characterize these materials in terms electrical properties.

The BaZrxTi1-xO3 for 0⩽x⩽15 ceramics were prepared by a conventional solid state reaction method and determined an X-ray diffraction (XRD) scanning electron microscopy (SEM) crystallographic, surface morphological compositional studies. A single phase with perovskite structure was identified in the samples at room temperature. No significant impurities detected EDS spectrum are good stoichiometric ratio. temperature dependence of electric conductivity evaluated range from 300 to 550 K...

In this paper results of new far-infrared and middle-infrared measurements (wavenumber range 4000cm-1 - 100cm-1) in the temperature from 300K to 8K CoFe2O4 ceramic are presented. The bands positions their shapes same wide range. quality sample was investigated by X-ray, EDS EPMA studies. reveals cubic structure (Fd-3m) 85K 360 K without any traces distortion. On current level knowledge polycrystalline does not exhibit phase transition 8 300 K.

Measurements of temperature/frequency dependence (30–500 °C) electric permittivities (Na0.5Bi0.5)0.9Pb0.1TiO3 ceramic under axial pressure (0–1500 bar) as well hysteresis loops have been carried out. It was shown that this material is sensitive to external stress. This connected with: (i) the shift phase transition, diffuseness permittivity characteristics, and reduction thermal hysteresis, (ii) decrease in field-polarization hysteresis. The results compared with data for pure Na0.5Bi0.5TiO3.

A lead-free solid solution Ba0.80Sr0.20Ti0.75Zr0.25O3 was prepared by a conventional technology. The structure and morphology of investgated samples were characterised X-ray diffraction (XRD) scanning electron microscopy (SEM). studies electric conductivity performed depending on temperature frequency measuring field. activation energy calculated from the Arrhenius plots.

Ferroelectric properties of BaTi1− x Hf O3 ceramics with content = 0, 0.001, and 0.025 were examined. It was found that the substitution Hf4+ for Ti4+ in BaTiO3 resulted shifting two low-temperature transitions (T 1, T 2) investigated samples to higher temperatures decreasing tetragonal-cubic phase transition temperature c). This is a well-known pinching effect. Thermal parameters transitions, such as enthalpy ΔH entropy ΔS, also estimated discussed.

The purpose of this study was to fabricate dense ceramic specimens from the system BaTiO3-BaHfO3 and then perform mechanical tests. effect Hf content on a microstructure properties solid solution investigated at room temperature. To determine elastic constants (the Young′s modulus E, shear G, bulk K Poisson′s ratio v) BaHfxTi1-xO3 method measurement longitudinal (VL ) transverse (VT ultrasonic wave velocities for type material developed.

Dielectric properties of BaTiO3(BT), BaTiO3+0.1wt.%MnO2(BTMn) and BaTiO3+0.1 wt.%Fe2O3 (BTFe) solid solution was investigated. The effects substitution on the microstructure electric BaTiO3 samples were studied by performing X-ray diffraction measurements. analysis shows formation single-phase compound with a tetragonal structure at room temperature. SEM microphotographs exhibit uniform distribution grains. (a real part electrical permittivity(□ε') an imaginary modulus (M")) investigated in...

The BaTiO3 and BaTiO3+X%wt.Eu2O3 (X = 1, 2, 3) ceramics were prepared by a solid phase reaction. structural morphology studies carried out means of an X-ray diffraction technique scanning electron microscopy, respectively. Elastic moduli determined with the use ultrasonic method. dielectric permittivity (ϵ′) tanδ as function composition temperature investigated. increasing concentration Eu ions leads to slight shift Curie changes characteristics ϵ′ tanδ. structural, mechanical properties...

Microstructure, material constants (Young modulus E, shear G, Poisson ratio v), Vickers hardness HV and fracture toughness K Ic of polycrystalline ferroelectrics Na1 - xLixNbO 3 for x ≤ 0.06 were investigated to determine their dependence on lithium concentration. It has been shown that the Young decreases with increase concentration in NaNbO up 2mol-percent. The highest variations mechanical properties appearing at 2mol-percent can be related occurence a morphotropic limit this...

Lead-free ceramics of Na0.5K0.5NbO3 (NKN), Na0.5K0.5(Nb0.94Sb0.06)O3 (NKNS6) and + 0.5%MnO2 (NKNS6 0.5%MnO2) have been prepared by a solid phase hot pressing sintering process. X-ray diffraction results show that the obtained samples possess perovskite structure. The micrograph fractured surface showed dense structure in good agreement with 91–94% relative density determined Archimedes method. An average grain size decreases Sb Mn doping (from about 20 μm for NKN to 5 2 NKNS6 0.5%MnO2,...

The electric properties of the Fe - doped BaTiO3 ceramics was investigated as a function frequency and temperature. structure morphology sample were characterized by an X-ray diffraction scanning electron microscopy. impedance measurements carried out at temperature ranging from 450 K to 600 K, range 0.1 Hz 10 MHz. Based on these parameters electrical grains boundaries described. bulk resistance thermal activation energies determined.

The barium titanate (BaTiO3) and the BaTiO3 + 0.1wt.% Eu2O3 ceramics were prepared by a conventional ceramic method. structural studies carried out means of an X-ray diffraction technique. influence grains grain boundaries on electrical properties was investigated using impedance spectroscopy. This technique enables us to determine values boundary resistance. results show that Eu doping leads significant reduction in resistance value (˜105Ω) with respect pure BT (˜107Ω). conductivity...

ABSTRACT Lead-free BaZrxTi1-xO3 (x = 0; 0.025; 0.125) ceramics have been obtained by a conventional method. A single-phase perovskite structure of the was identified X-ray diffraction EDS analysis, performed for individual grains tested sample, showed good homogeneous distribution all elements throughout grains. The thermal behaviour studied using Differential Scanning Calorimetry (DSC). Measurements influence Zr addition on character phase transition in BaTiO3 structure. results were...

In the paper influence of zirconium admixture on structure and material constants polycrystalline ferroelectric materials BaZrxTi1-xO3 (BZT) was examined. The barium zirconate titanate samples were prepared by a conventional solid state reaction method. A single phase with perovskite samples, identified an X-Ray diffraction technique at room temperature. performed EDS study revealed that perfectly sintered chemically homogeneous. dependence shear modulus G sample composition is similar to...

The polycrystalline sample of BaTi0.95Ge0.05O3 was prepared by solid-phase reaction using a conventional method. morphology investigated characterised scanning electron microscopy (SEM). results allowed to determining the stoichiometry material and evaluate their microstructure. High quality samples were investigated, grains are well shaped without glassy phase. dielectric properties ceramics determined. compared with these ones obtained for pure BaTiO3. data indicated that substitution Ge+4...

Microstructure and material constants such as Young modulus E, shear G, Poisson ratioν of polycrystalline ferroelectric materials Ba1-xSrxTiO3 for 0≤x≤0.4 were investigated to determine their dependence on strontium concentration. The performed investigations showed that the is chemically homogeneous. It was found concentration had no significant influence grain size. highest value Young's observed Ba0.6Sr0.4TiO3 sample. mechanical properties made it possible evaluate usability this...

In this paper, results of new infrared FIR-MIR measurements (wavenumber range 4000–100 cm−1) in the temperature 300 ÷ 8 K BiFeO3 ceramic are presented. Below 200 only one symmetric band at ca. 800 cm−1 is visible. The full width half maximum decreases exponentially on cooling. shape 545 cm−1connected with A1 (TO) mode also changes between 60–40 K, vicinity phase transition 50 K. Initially a broad reveals its components as shoulder bands. Theirs FWHM decrease

Dielectric properties of BaTiO3, BaTiO3 + 0.1 wt.% Fe2O3 and 1 ceramics were studied. The dielectric measurements performed at the temperature ranging from 130 K to 500 frequency Hz 10 MHz. Phase transitions also determined by a thermal analysis in wide range. Both electrical characterization techniques show that phase transition is shifted towards lower temperatures with increasing content. changes diversity observed occurred as consequence ion substitution. Such behaviour investigated...

Abstract Aim of the present research was to apply a solid state reaction route fabricate Aurivillius-type ceramics described with formula Bi 6 Fe 2 Ti 3 O 18 (BFTO) and reveal influence processing conditions on its crystal structure. Pressureless sintering in ambient air employed temperatures were 850 1080 °C. It found that fabricated BFTO multiphase ones. They consisted two m+1 m-3 3m+3 phases, namely phase m=5 (i.e. stoichiometric phase) m=4 reduced number layers slab). Detailed X-ray...

Lead-free ceramics Na0.5K0.5(Nb1-xSbx)O3+0.5mol%MnO2 (x = 0.04, 0.05 and 0.06) were prepared by conventional sintering hot pressing process; their microstructure dielectric properties have been studied. It is found that increase of temperature promotes the obtaining highly dense in grain size while doping with Sb contributes to more homogeneous smaller size. Low frequency (100 Hz-200 kHz) investigations revealed diffuse phase transitions. can be concluded from experimental results improves...

The effect of MnO 2 doping on the structure, microstructure and dielectric properties BaTiO 3 has been studied.For this purpose -doped ceramics have prepared using a conventional ceramic method.The energydispersive X-ray spectroscopy investigations revealed that samples Ba-TiO + x wt.% (x = 0.01; 0.1) are perfectly sintered.Our studies shown all electric parameters under investigation depend frequency field amount manganese substitution.In order to understand better character phase...

The Fe-doped BaTiO3 ceramics with various iron concentration were prepared by the conventional ceramic technology.Structure of samples was studied X-ray diffraction, scanning electron microscopy and energydispersive spectroscopy.Hyperfine interactions determined using Mössbauer spectroscopy.As confirmed structural investigations, obtained materials are good quality ceramics, homogeneous free oxides Fe dopant clustering.It found that ions incorporated into tetragonal lattice barium titanate,...