Effect of gamma radiation on the properties of bismuth …
Glasses and glass ceramic materials with the compositions (in moles) 2Bi2O3; 3SiO2 and 2Bi2O3; 3GeO2 were irradiated with γ-rays at doses 105 and 106 rad. The pre- and post-irradiation absorption spectra, microhardness and refractive indices of the glass and glass ceramic samples were studied. It was shown that gamma radiation …
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Ferroelectric and piezoelectric properties of bismuth titanate ceramic …
Ca0.4Sr0.6Bi4Ti4O15 ceramics with a-axis preferred orientation were prepared by a solid-state reaction method. The cylindrical Ca(0.4)Sr(0.6)Bi(4)Ti(4)O(15)ceramics were cut into two types of ...
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Large strain and strain memory effect in bismuth ferrite lead-free ceramics
An electric-field-induced strain in ferroelectric materials has extensive applications in actuators and sensors. BiFeO3 (BFO) ceramic is a promising candidate for high-temperature electromechanical coupling applications due to its exceptionally high Curie temperature (Tc ∼ 825 °C). Here, we reported an enhan 2017 Journal of Materials …
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New design of bismuth borate ceramic/epoxy composites …
New design of bismuth borate ceramic/epoxy composites with excellent fracture toughness and radiation shielding capabilities - ScienceDirect. Abstract. …
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Piezoelectricity and flexoelectricity of sodium bismuth titanate-based
In this paper, the variation of piezoelectricity of sodium bismuth titanate-barium titanate (NBBT) ceramics after high temperature reduction was researched. A kind of ceramic with piezoelectric and flexoelectric properties was obtained by reducing one surface of ceramics at a high temperature. The relationship between the reduction …
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Bismuth Ferrite-Based Lead-Free High-Entropy Piezoelectric …
Abstract. Piezoelectric ceramics, as essential components of actuators and transducers, have captured significant attention in both industrial and scientific research. The "entropy …
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Bismuth-based Piezoelectric Ceramics | SpringerLink
Bismuth-based Piezoelectric Ceramics. Tadashi Takenaka. Chapter. 8486 Accesses. 4 Citations. Important ferroelectric or antiferroelectric oxide ceramics for dielectric, …
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Microwave dielectric properties of bismuth-substituted Ba
The impact of bismuth substitution at neodymium (Nd) site in aluminum-replaced Ba3.75Nd9.5Ti18O54 ceramics on dielectric constant (ε r), quality factor (Qf), and temperature coefficient of resonant frequency (τ f ) has been determined (0.05 ≤ x ≤ 0.2). With appropriate quality factor values (Qf > 5000 GHz), the dielectric constant increased …
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Investigation of BiFeO 3 -BaTiO 3 lead-free piezoelectric ceramics …
BiFeO3-BaTiO3 (BF-BT)-based lead-free ceramics are promising piezoelectric materials exhibiting high Curie temperatures and excellent electrochemical properties.
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Microstructure evolution and properties of dissimilar …
The network structure of bismuth-based glass ceramic was analyzed by attenuated total reflection infrared spectrum (ATR) and Raman spectrum. It can be observed in Fig. 2 that there are five absorption bands in the infrared absorption spectrum, namely 650-750 cm −1, 790-860 cm −1, 1050-1140 cm −1, 1200-1280 cm −1 and 1690-1760 cm −1.The …
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Synthesis and characterization of strontium and barium bismuth …
Bismuth borate (BiBO 3) phase was synthesized by Iordanova [12] by crystallization of binary and ternary glass compositions in the Bi 2 O 3 –MoO 3 –B 2 O 3 system. ... FT-IR spectra of BBB glass and BBB600 glass-ceramic. Download : Download full-size image; Fig. 6.
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Core–Shell Grain Structure and High Energy Storage
Bismuth sodium titanate (Bi 0.5 Na 0.5 TiO 3, BNT) based ferroelectric ceramic is one of the important lead free dielectric materials for high energy storage applications due to its large polarization.Herein, we reported a modified BNT based relaxor ferroelectric ceramics composited with relaxor Sr 0.7 Bi 0.2 TiO 3 (SBT) and ferroelectric …
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Investigation of Dielectric, Ferroelectric and Conduction …
The present manuscript explores the impact of Dy doping in the Tantalum based bismuth layer structured ferroelectrics with chemical composition of Sr(Bi 1-x Dy x) 2 Ta 2 O 9 (where x = 0.00, 0.025, 0.05, 0.075 and 0.10) prepared by mixed oxide process. X-ray diffraction study of all the ceramics implement orthorhombic phase without any …
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Phase evolution and electrical behaviour of samarium …
Fig. 3 shows the SEM images of BSF15 and BSF18 ceramics as representative example, while the images of the other compositions are given in the Supporting information as Fig. S6. The Bi 25 FeO 40 phase is mainly present at the grain boundaries, while Bi 2 Fe 4 O 9 is evidenced within the grains, in agreement with …
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New Bismuth Sodium Titanate Based Ceramics and Their …
The classical view of the structural changes that occur at the ferroelectric transition in perovskite-structured systems, such as BaTiO3, is that polarization occurs …
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Origin of Polarization in Bismuth Sodium Titanate-Based Ceramics …
The classical view of the structural changes that occur at the ferroelectric transition in perovskite-structured systems, such as BaTiO3, is that polarization occurs due to the off-center displacement of the B-site cations. Here, we show that in the bismuth sodium titanate (BNT)-based composition 0.2(Ba0.4Sr0.6TiO3)–0.8(Bi0.5Na0.5TiO3), …
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On Corrosion Properties of Ceramic Materials for Pump
The purpose of this work is a qualitative analysis and evaluation of the interaction of the ceramic and composite materials with the flow of liquid lead–bismuth coolant (coolant flow rate up to 2 m/s, temperature up to 550°C), pumped with oxygen, and the selection of the most heat-resistant material from them for use as friction couples of ...
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Effects of oxide additives on structure and properties of bismuth
Effects of oxide additives (Bi2O3, MnO2, La2O3, Sm2O3, SnO2, and Nb2O5) on structure and properties of 0.70Bi1.05FeO3–0.30BaTiO3 ceramics were investigated. Their microstructure and electrical properties were dependent on the types and contents of oxide additives. A large piezoelectric constant (d 33) of 135–200 pC/N …
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Investigation of the dielectric and optoelectronic properties …
The real part of the dielectric permittivity of bulk ceramic ferroelectric of composition Bi 1−x Nd x FeO 3 (x = 0, 0.15, 0.2), synthesized by solid-state route, was characterized in the frequency range 0.1–3.5 THz using time-domain Tera-Hertz spectroscopy, and the effect of Nd 3+ concentration on the Terahertz (THz) properties of …
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Nonstoichiometric Effects in the Leakage …
July 2017 Nonstoichiometric Effects in the Leakage Current and Electrical Properties of Bismuth Ferrite Ceramics 325 (1) Here, R is the resistance [Ω], A is the specimen cross-section
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Improvement in dielectric and ferroelectric property of
The dysprosium doped barium bismuth titanate ceramic with general formula BaBi 4−x Dy x Ti 4 O 15 (BBDT) were prepared by solid-state reaction process. The effect Dy 3+ on Bi 3+ sites on the structural, microstructure, dielectric, conductivity and ferroelectric behaviour of BaBi 4 Ti 4 O 15 ceramics were investigated. X-ray diffraction …
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Preparation and study of La-doped bismuth sodium
Bismuth sodium titanate (BNT) (Bi 0.5 Na 0.5 TiO 3) emerges as a prospective lead-free piezoelectric ceramic with improved characteristics, boasting a high residual polarization (P r) of 38 μC/cm 2 and coercive fields (E c) of 73 kV/cm [[7], [8], [9]]. The challenges associated with high coercive field, conductivity, and domain switching ...
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Physical properties and sinterability of pure and iron-doped bismuth …
Pure (BNT) and iron-doped bismuth sodium titanate (Fe-BNT) ceramics were produced according to the formula Bi 0.5 Na 0.5 Ti 1−x Fe x O 3−0.5x, where x = 0 to 0.1. The addition of Fe 2 O 3 enables decreasing the sintering temperature to 900 °C in comparison with 1075 °C for pure BNT, whilst also achieving lower porosities and greater …
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Room temperature magnetoelectric coupling in Fe-doped sodium bismuth
Fe doped sodium bismuth titanate ceramics were synthesized by solid state reaction. ... Download : Download high-res image (552KB) Download : Download full-size image; Fig. 1. (a) PXRD patterns of the unpoled and poled ceramics (b) Rietveld refinement fit of unpoled NBTFO1 (bottom panel) and NBTFO2 (top panel).
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Effect of Nd3+ substitution on structural, morphological, and
Bi1-xNdxFeO3 (x = 0, 0.1, 0.15, 0.20) bulk ceramics were successfully synthesized by solid-state method and influence of Nd3+ substitution on the electrical properties of polycrystalline BiFeO3 (BFO) was studied at lower electric fields (≤ 2 kV/cm) and reported for the first time. With progressive Nd3+ substitution a change in the …
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(PDF) Enhanced energy storage properties in sodium bismuth …
The perovskite-structured BNT-based ceramics exhibit a strong ferroelectric response, since Bi 3+ has a lone pair of electrons (6s 2 ), which strongly hybridizes with the oxygen 2p orbital [19].
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Origin of Polarization in Bismuth Sodium Titanate-Based Ceramics …
The classical view of the structural changes that occur at the ferroelectric transition in perovskite-structured systems, such as BaTiO3, is that polarization occurs due to the off-center displacement of the B-site cations. Here, we show that in the bismuth sodium titanate (BNT)-based composition 0.2(Ba0.4Sr0.6TiO3)–0.8(Bi0.5Na0.5TiO3), this model …
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Bismuth layer-structured piezoelectric ceramics with high
Bismuth layer structured lead free piezoelectric ceramics in the system Sr1−x Ca x Na0.5Bi4.5Ti5O18 + 1 wt% CeO2 (SC x NBTC; x = 0, 0.25, 0.5, 0.75 and 1) have been prepared through the conventional solid-state reaction method. X-ray diffraction measurement indicates that a single phase layered perovskite was obtained for all …
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New lithium bismuth phosphate ceramic: crystal structure
A new type of lithium bismuth phosphate 3Li2O–Bi2O3–6P2O5 (3L1B6P) microwave dielectric ceramics were prepared via a conventional solid-state route. Crystal structure, microstructure, microwave dielectric properties and aluminum electrode co-firing compatibility of the 3L1B6P ceramics were investigated. The 3L1B6P ceramics mainly …
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Magnetic contributions in multiferroic gadolinium modified bismuth
Traces of Pbam were found in the ceramics using transmission electron microscopy in previous studies [18]. Download : Download high-res image (491KB) Download : Download full-size image; Fig. 1. a) Powder XRD pattern for Bi 0.88 Gd 0.12 FeO 3 with major peaks labelled according to the rhombohedral notation. Inset (left) …
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