Given the capability to finely control the ramp and dwell temperatures, as well as the duration of UHS, it is highly possible to be able to further refine the grain size and density of UHSed barium titanate to tailor its grain-size dependent dielectric properties. Fig. 8.
The results revealed the presence of pure barium titanate (PDF#79-2263), with no significant tetragonal phase splitting features observed between the 2 θ angles of 44° and 46°. Instead, a single peak of the pseudocubic phase was observed, which can be attributed to the diffusion of additives into the grains.
Application of Ultrafast High-temperature Sintering (UHS) technique to rapidly densify barium titanate ceramics has been explored for the first time. Bulk ceramic with ~94% density was obtained by UHS at ~1340 °C for 60 seconds. The densification process was accompanied with progressive sample discolouration from light to dark grey.
Calcium is a commonly used dopant in the barium titanate system due to its excellent solid solubility, forming (Ba 1-x Ca x)TiO 3 (BCT). Mitsui et al. discovered that the temperature stability of the dielectric constant is improved and widened when BCT with high calcium content is in the tetragonal phase.
As such, with a carefully managed profile, it would still be possible to uniformly densify thicker pieces of barium titanate with UHS, if the temperature is kept below the critical temperature, or sufficient time is allowed via ramping up to bring the sample to a uniform temperature before exceeding 1320 °C.
This behaviour has also been seen in barium titanate sintered via flash spark-plasma-sintering technique by Manière et al. . The results confirm that the discolouration and the large dielectric constant in the grey coloured ceramics are due to the presence of oxygen vacancy.
Grain Boundary Oxidation in PTCR Barium Titanate Thermistors
Grain boundary regions in n-conducting barium titanate (BaTiO3) are re-oxidized during the cooling process after sintering the ceramics in air. The kinetics of this re-oxidation process is ...
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Enhancing energy storage performance in barium titanate …
This research focuses on boosting the energy storage capabilities of BaTiO3 ceramics through Mg2+ doping. Introducing Mg2+ ions into the BaTiO3 lattice induces defects …
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Effect of sintering temperature on the grain growth and electrical ...
increase with the increase in grain size. 1 Introduction Barium titanate is a very useful material owing to its high dielectric constant and lead free composition [1, 2]. This material has been used for a wide range of scientific and industrial applications such as capacitors, ultrasonic transducers, pyroelectric infrared sensors, etc. At the Curie temperature (T c) there is a sharp …
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Effect of sintering temperature on the grain growth and electrical ...
In the present work, structural, dielectric and ferroelectric properties of barium zirconate titanate ferroelectric ceramics have been investigated. The specimens were synthesized using a solid state reaction technique. The XRD analysis reveals that the synthesized compound was formed with no secondary phases. As the sintering temperature increases from 1,200 to …
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Dielectric properties of BaTiO3 and Ba0.95Ca0.05TiO3 sintered in a ...
Adding co-dopants Y 3+ and Mg 2+ can significantly impact the formation of a core-shell structure in barium titanate-based multilayer ceramic capacitors (BME MLCCs), …
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Simple synthesis of barium titanate ceramics with controllable grain …
By giving the size of the BaTiO 3 powders and the combination way, the binary particle size self-assembly sintering method can controllably synthesize the ceramics with different grain sizes. When the powders combination is 400 nm + 80 nm, the relative density of the ceramics with grain size 450 nm is 92%.
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Effect of Yb2O3 doping on energy storage and dielectric …
In addition, after Yb3+ ions were incorporated into the lattice of barium titanate, the cubic phase of barium titanate was slightly distorted, the lattice constant of the sample gradually increased, and the tetragonality of the sample gradually decreased. With the increase of Yb2O3 content, the porosity and the diffuseness degree (γ) of the ceramics first decreased …
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Effect of Liquid‐Phase Sintering on the Breakdown Strength of Barium ...
Request PDF | Effect of Liquid‐Phase Sintering on the Breakdown Strength of Barium Titanate | A glass used to liquid-phase sinter BaTiO3 was developed and its properties were tested to determine ...
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Sintering behaviors and dielectric properties of nanocrystalline barium …
Nanometer-scale barium titanate (BaTiO3) powders were prepared via a process consisting of chemical dispersion and physical grinding/mixing. Sintering behaviors, microstructures as well as their correlations to dielectric properties of nano-BaTiO3 sintered at the temperatures ranging 1100 to 1300 C for various time spans were investigated.
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Bimodal grain sized barium titanate dielectrics enabled under …
The objective of this paper is to cold sinter barium titanate with a controlled bimodal mixture of fine grain barium titanate of 50, 100, and 200 nm with 1 μm inclusions, compare this to corresponding unimodal distributions, and investigate the consequences on the microstructure and electrical properties.
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Bimodal grain sized barium titanate dielectrics enabled under the …
The objective of this paper is to cold sinter barium titanate with a controlled bimodal mixture of fine grain barium titanate of 50, 100, and 200 nm with 1 μm inclusions, …
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The Overview of The Electrical Properties of Barium Titanate
Barium titanate, perovskite structure, is a common ferroelectric material with a high dielectric constant, widely utilized to manufacture electronic components such as mutilayer capacitors …
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Barium Strontium Titanate-based multilayer ceramic capacitors …
The MLCCs were sintered with a slow heating rate of 3 °C·min −1 and a rapid heating rate of 20 °C·min −1, respectively. The sintering process on the ESP of 0.4BST-0.4BNT-0.2SZ MLCCs was investigated. The IS and TSDC technologies were employed to reveal the types of charge carriers and the conduction mechanism within the MLCCs ...
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Improving the Energy Storage Performance of Barium …
The formation of a liquid phase in the sintering process can reduce the sintering activation energy, which can promote material transformation during sintering and the densification of ceramics; this consequently improves …
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Improving the Energy Storage Performance of Barium Titanate …
The formation of a liquid phase in the sintering process can reduce the sintering activation energy, which can promote material transformation during sintering and the densification of ceramics; this consequently improves the density and refines the grain size, resulting in enhanced energy storage performance [24,25].
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Dielectric properties of BaTiO3 and Ba0.95Ca0.05TiO3 sintered in …
Adding co-dopants Y 3+ and Mg 2+ can significantly impact the formation of a core-shell structure in barium titanate-based multilayer ceramic capacitors (BME MLCCs), improving their performance. Y 3+ can easily dissolve in the BaTiO 3 lattice and contribute to the formation of the shell, while Mg 2+ remains at the grain boundaries.
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Unfolding grain size effects in barium titanate ferroelectric ceramics ...
To solve this controversy, the dependence of the dielectric, piezoelectric and ferroelectric properties on the average grain size of barium titanate ceramics prepared by conventional sintering (CS ...
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Sintering behaviors and dielectric properties of nanocrystalline …
Nanometer-scale barium titanate (BaTiO3) powders were prepared via a process consisting of chemical dispersion and physical grinding/mixing. Sintering behaviors, microstructures as well …
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Ultrafast high-temperature sintering of barium titanate ceramics …
We have shown that UHS is a viable technique to densify barium titanate, and have demonstrated that, with sintering temperature and time of 1340 °C and 60 s, barium titanate with ~94% relative density and average grain size of 2.36 µm can be prepared. With UHS temperature further increased or heating duration prolonged, the ceramic ...
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TEM and STEM investigation of grain boundaries and second …
Although grain boundary films commonly occur in ceramics, most studies on barium titanates by transmission electron microscopy (TEM) failed to demonstrate the presence of grain boundary films [11, 15, 17].
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The Overview of The Electrical Properties of Barium Titanate
Barium titanate, perovskite structure, is a common ferroelectric material with a high dielectric constant, widely utilized to manufacture electronic components such as mutilayer capacitors (MLCs), PTC thermistors, piezoelectric transducers, and a variety of electro-optic devices.
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Simple synthesis of barium titanate ceramics with controllable …
By giving the size of the BaTiO 3 powders and the combination way, the binary particle size self-assembly sintering method can controllably synthesize the ceramics with …
Learn More
Effect of Ag on the Sintering and Grain-Growth Behavior of Barium Titanate
Request PDF | Effect of Ag on the Sintering and Grain-Growth Behavior of Barium Titanate | Silver and its alloys frequently are used as electrode material for BaTiO3-based dielectrics. In the ...
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Enhancing energy storage performance in barium titanate …
This research focuses on boosting the energy storage capabilities of BaTiO3 ceramics through Mg2+ doping. Introducing Mg2+ ions into the BaTiO3 lattice induces defects and grain boundary effects, significantly influencing ferroelectric properties. Rietveld refinements of X-ray diffraction confirmed that both pure and Mg-doped samples show the ...
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GRAIN SIZE AND CONDUCTIVITIES ANOMALY IN DONOR
support the thermodynamic approach for the explanation of the grain size anomaly. Introduction Barium titatante is one of the most important ceramic materials in electronics. As an intrinsic ferroelectric material it can be used in various applications, for example: as a capacitor, a multilayer capacitor, a grain boundary capacitor and thermistor.
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TEM and STEM investigation of grain boundaries and second …
Although grain boundary films commonly occur in ceramics, most studies on barium titanates by transmission electron microscopy (TEM) failed to demonstrate the presence of grain boundary …
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Barium Strontium Titanate-based multilayer ceramic capacitors …
The MLCCs were sintered with a slow heating rate of 3 °C·min −1 and a rapid heating rate of 20 °C·min −1, respectively. The sintering process on the ESP of 0.4BST …
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The effects of sintering temperature on dielectric constant of Barium ...
Barium Titanate (BT) has been synthesized using solid-state reaction method. Raw materials are Barium Carbonate (BaCO 3) and Titanium Dioxide (TiO 2).These materials are mixed for 6 h and sintered at a temperature of 1000 o C, 1100 o C, and 1200 o C for 2 h. The sintering temperature was varied to investigate its effects on microstructure and dielectric …
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Effect of Sintering Atmosphere on the Dielectric Properties of Barium ...
The potential of a two-stage sintering technique as a low-cost and simple ceramic fabrication to obtain highly dense and pure barium titanate ceramics with small grain size was demonstrated in ...
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