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There are imperious demands for developing eco-benign energy storage materials with high-performance in a sustainable society. In this paper, we introduce Sr0.85Bi0.1 0.05TiO3 (SBT) and NaNbO3 (NN) into Bi0.5Na0.5TiO3 (BNT) ceramics through compositional design. The introduction of Sr2+ ions and vacancies at 2019 …
The ceramic grains show the typical plate-like structure of the bismuth layer. Cu/W co-doped CBN ceramics increased the distortion of NbO6 octahedron, and significantly enhanced the piezoelectric ...
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 …
Bismuth titanate(BIT) ceramics have been widely studied for high temperature applications thanks to their high Curie temperature and large spontaneous polarization.The underlying domain structures play significant roles in regulating the macroscopic properties of ferroelectric materials, while there is only limited knowledge of …
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The grain orientation technique, which is one of several ceramic preparation methods with a controlled grain structure during the ceramic sintering process, gives an anisotropic single-crystal-like behavior to the ceramics with lower symmetric crystal structure such as the bismuth layer-structured and the tungsten bronze types than the …
There are imperious demands for developing eco-benign energy storage materials with high-performance in a sustainable society. In this paper, we introduce Sr0.85Bi0.1 0.05TiO3 (SBT) and NaNbO3 (NN) into Bi0.5Na0.5TiO3 (BNT) ceramics through compositional design. The introduction of Sr2+ ions and vacancies at 2019 Journal of Materials …
1. Introduction (Bi 0.5 Na 0.5)TiO 3 (BNT) was first reported by Smolenskii et al. in 1960 [].BNT ceramic is a kind of ABO3 type ferroelectrics which is replaced by Na + and Bi 3 + complex ions at A-site. The A-site ions of BNT ceramics are located at the eight corner positions of octahedron, and the B-site ions are at the body center of octahedral …
It was a wonderful opportunity to be included in Ceramic Review and share my knowledge and experience with such a wide audience. I first came across Ceramic Review over 30 years ago when working with Robin Welch in Suffolk. It is an important publication and is extremely supportive of the ceramics community. Jennifer Lee – …
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The crystal structure of Sr- and Mg-doped NBT ceramics has been investigated in our recent work [].All the ceramics had a perovskite structure. Figure 1 shows the SEM and EDS images of the bilayer ceramic sample NBS4T-NBS4TM2. In Fig. 1a, the black line marks the interface between the two ceramic layers. Some fibrous …
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The classical view of the structural changes that occur at the ferroelectric transition in perovskite-structured systems, such as BaTiO 3, 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(Ba 0.4 Sr 0.6 TiO 3)–0.8(Bi 0.5 Na 0.5 …
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 …
The coexistence of R3c and Cc phases is confirmed through the Rietveld refinement analysis of the XRD profiles of the ceramics, as depicted in Fig. 3 (a)-(f). Furthermore, the magnified (110) pc and (211) pc diffraction peaks for the Rietveld refinements are shown in the Fig. 3 (g). The curves after the refinement are well fit with the measured curves.
Dielectric, ferroelectric, and piezoelectric properties including phase transition temperatures of perovskite-type bismuth sodium titanate, (Bi 1/2 Na 1/2)TiO 3 [BNT]-based lead-free piezoelectric ceramics have been reviewed from the results obtained by our group being superior candidates for lead-free piezoelectric materials to …
1. Introduction. Laser-induced crystallization has emerged as an innovative technique for fabricating glass-ceramics with exceptional properties [1], [2].Glass ceramics are widely used in various fields such as electronics, photonics, biomaterials, and energy storage devices [3], [4], [5].High chemical endurance, high refractive index, and …
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The ceramic materials of SiC and Ti{sub 3}SiC{sub 2} showed high corrosion resistance with no penetration of LBE into their matrices. The SiC/SiC composite showed LBE penetrated into the matrix due to high porosity of the material. ... {Corrosion resistance of refractory metals and ceramics in lead-bismuth at 700 deg} author = {Khalid Rivai, A ...
Fig. 1 (a,b) shows the cross-section SEM grain morphologies of thermally etched BFO7Nd and BFO7Gd ceramics, indicating average grain sizes of ∼2.3 μm and ∼2.2 μm, respectively. Fig. 1 (c) depicts XRD patterns, indicating a primarily rhombohedral R3c symmetry. Compared to pure BiFeO 3, the XRD peaks of BFO7Nd and BFO7Gd …
Ferroelectric materials possess spontaneous polarization that can be switched by an application of an external electric field. To investigate the ferroelectricity of (Bi 0.93 Sm 0.07)FeO 3 ceramic, local ferroelectric polarization is investigated by acquiring local phase hysteresis loops through piezoresponse force microscopy, as shown in Fig. …
As a perovskite (ABO 3 ) relaxor ferroelectric ceramics with A-site disorder, sodium bismuth titanate Bi 0.5 Na 0.5 TiO 3 (BNT) has gained great attention since its discovery by Smolensky in 1960 ...
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In this work (0.85-x)Na0.5Bi0.5TiO3-0.15NaNbO3-xSr0.85Bi0.1TiO3 ceramic system abbreviated as (NBT-NN-xSBT) was prepared through the conventional solid-state method. The effect of doping level on crystal structures, microstructures, dielectric, and energy-storage properties were investigated in-detail. The coexistence of …
Bismuth sodium titanate (BNT) ceramics of the composition Bi 0.5+x Na 0.5-x TiO 3 with x = 0.005 and 0.010 were prepared by the conventional solid state route. ... When sintered in air, the samples appear opaque as common ceramic material with no translucent properties. The densities of all samples were over 99 % of the theoretical …
1. Introduction. Sodium bismuth titanate (NBT) is a key lead-free piezoelectric ceramics, on account of its strong ferroelectric property, large remnant polarization (P r =38 µC/cm 2), medium piezoelectric constant (d 33 =73 pC/N) and high Curie temperature (T c =320 °C) [1], [2].Lack of fundamental understanding about the …
