Sintering of Grain Boundary Capacitors
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We prepared TiO 2-rich CaCu 3 Ti 4 O 12 (CCTO) ceramics by a solid-state sintering process and observed large nonlinear electrical and high dielectric behaviors. Microstructure and phase composition analyses show that CCTO grain-amorphous/ TiO 2 nanograin boundary-CCTO grain junction structures exist in these TiO 2-rich CCTO …
Grain boundary behavior in varistor-capacitor
We prepared TiO 2-rich CaCu 3 Ti 4 O 12 (CCTO) ceramics by a solid-state sintering process and observed large nonlinear electrical and high dielectric behaviors. Microstructure and phase composition analyses show that CCTO grain-amorphous/ TiO 2 nanograin boundary-CCTO grain junction structures exist in these TiO 2-rich CCTO …
Hydrogen-induced degradation in SrTiO3-based grain boundary barrier layer ceramic capacitors …
Hydrogen-induced degradation in SrTiO 3-based grain boundary barrier layer ceramic capacitors was studied through electrochemical hydrogen charging, in which the capacitors were placed in 0.01 M NaOH solution with hydrogen deposited on their electrodes from the electrolysis of water. ...
Microstructure evolution during the co-sintering of Ni/BaTiO3 multilayer ceramic capacitors …
We use the model of Parhami and McMeeking for sintering. 23 It assumes that grain boundary and surface diffusions are the major mechanisms of mass transport. 15, 22 Particles approach each other due to the flux of vacancies from the inner of the grain
Microstructure evolution during the co-sintering of Ni/BaTiO3 ...
Multi-Layer Ceramic Capacitors (MLCCs), characterized by their high volumetric efficiency, high reliability, and excellent high-frequency features, dominate in the ceramic capacitor market. ... We use the model of Parhami and McMeeking for sintering. 23 It assumes that grain boundary and surface diffusions are the major mechanisms of …
Ni-doping effect on spark-plasma sintering of tungsten compacts: Synergy of grain boundary …
The sintering temperature of 1673 K has been chosen, since grain growth phenomenon of pure W ultrafine-grain sample is reported to be weak at this condition [32], [33]. The sintering process was held for 1 or 30 min to assess the effect of the consolidation time on the sample microstructures and the mechanical properties.
Evidences of Grain Boundary Capacitance Effect on the Colossal …
The present results support that the grain boundary capacitance effect plays an important role in the CP and nonlinear I-V behavior of (Nb + In) co-doped TiO2 …
Influence of sintering and annealing temperature on grain …
To produce grain boundary barrier layer capacitors with a simpler fabrication process and more-stable dielectric characteristics, a modified reduction-reoxidation method was …
Enhanced reliability of ultra-thin multilayer ceramic capacitors …
Ultra-thin base metal electrodes-multilayered ceramic capacitors (BME-MLCCs) with high volume capacitance are considered to be a charming device for a diverse range of electric applications. Here, we fabricated the MLCCs with ultra-thin layer of ~ 1.2 μm and a high capacitance of ~ 47 μF via high oxygen re-oxidation process. Defect chemistry …
Unveiling of interstice-occupying dopant segregation at grain ...
When aliovalent foreign cations are doped into ABO 3-type perovskite oxides, they are usually substituted for either dodecahedral A or octahedral B sites, depending on their relative ionic size addition, their effective charge can be ionically compensated through the creation of positively charged oxygen vacancies for acceptor doping and negatively …
Equivalent Circuit Model in Grain‐Boundary Barrier Layer Capacitors …
Download Citation | Equivalent Circuit Model in Grain‐Boundary Barrier Layer Capacitors ... of the shell material in order to reach a large capacity of the grain boundaries after sintering.
Tuning dielectric performance in novel Na1/2Er1 ...
The synthesis of novel Na 1/2 Er 1/2 Cu 3 Ti 4 O 12 (NECTO) ceramics using conventional solid-state methods and their characterization as well as their dielectric properties were investigated at various temperatures of sintering. SEM results revealed an increase in average grain size with sintering temperature. The sintered NECTO sample …
Enhancing grain boundary contributions to improve the dielectric properties of (In0.5Nb0.5)0.05Ti0.95O2 ceramics by Bi aided sintering …
Therefore, enhancing grain boundary density and ceramic compactness can efficaciously reduce their low-frequency dielectric loss. In this investigation, Bi 2 O 3 addition was utilized to aid sintering and refine grains …
Effect of sintering on grain boundary microstructure and electrical …
The results demonstrate that the grain-boundary microstructure and the electrical properties are influenced by sintering conditions: By raising sintering …
One-step, low-temperature sintering of SrTiO/sub 3/ based grain boundary barrier layer capacitor …
A novel technique was developed to fabricate SrTiO/sub 3/-based GBBL (grain-boundary barrier layer) capacitor materials. The main feature of this technique is one-step, low-temperature (1100-1200 degrees C) sintering of the material, which is doped with a sintering aid composed of Li/sub 2/O and SiO/sub 2/, in a reducing atmosphere. The …
Enhancing grain boundary contributions to improve the dielectric ...
The internal barrier layer capacitance effect substantially contributes to the colossal permittivity in In and Nb co-doped TiO 2 (INTO) ceramics. Therefore, enhancing grain boundary density and ceramic compactness can efficaciously reduce their low-frequency dielectric loss. In this investigation, Bi 2 O 3 addition was utilized to aid …
Review: liquid phase sintering | Journal of Materials Science
Liquid phase sintering (LPS) is a process for forming high performance, multiple-phase components from powders. It involves sintering under conditions where solid grains coexist with a wetting liquid. Many variants of LPS are applied to a wide range of engineering materials. Example applications for this technology are found in automobile …
Enhancement in grain and grain boundary resistivity of BPZT …
Here we are reporting the effect of two-stage sintering on electrical properties of the Ba 0.80 Pb 0.20 Ti 0.94 Zr 0.06 O 3 (BPZT) ceramics. For the two-stage sintered sample, small change in morphology in the microstructure and enhancement in the grain and grain boundary resistivity is observed.
Grain boundary behavior in varistor-capacitor TiO2-rich …
We prepared TiO 2-rich CaCu 3 Ti 4 O 12 (CCTO) ceramics by a solid-state sintering process and observed large nonlinear electrical and high dielectric behaviors. Microstructure and phase composition analyses show that CCTO grain-amorphous/ TiO 2 nanograin boundary-CCTO grain junction structures exist in these TiO 2-rich CCTO …
Investigation of grain boundaries for abnormal grain growth in …
Strontium titanate (SrTiO3) is widely used in electronic devices, and it is a model material for understanding the structural and dielectric properties of grain boundaries (GBs). In such materials, the GBs often play a dominant role in sintering and microstructural behavior. Abnormal grain growth (AGG) is a commonly observed …
Improving the electric energy storage performance of multilayer …
Specifically, we adopted a two-step sintering process, by which the grain size of MLCCs sintered reduces by 60 %, the dielectric breakdown field strength …
Recent progress of cold sintering process on functional ceramic ...
where E is the measured or calculated energy in the sintering process, m is the weight of samples, C P is the heat capacity of the powder, and T s is the sintering temperature in the conventional processes. Based on the Eq. (), the normalized the power density of various sintering processes that used to prepare BaTiO 3, ZrO 2, KH 2 PO 4, …
Evidences of grain boundary capacitance effect on the colossal …
impurity segregation can be achieved at grain boundaries. The present results support that the grain boundary capacitance effect plays an important role in the CP and nonlinear …
Enhancing grain boundary contributions to improve the dielectric …
Abstract. The internal barrier layer capacitance effect substantially contributes to the colossal permittivity in In and Nb co-doped TiO 2 (INTO) ceramics. …
Sintering
Fused deposition modeling of fully inorganic parts: Shaping, debinding, and sintering (SDS) Antonella Sola, Adrian Trinchi, in Fused Deposition Modeling of Composite Materials, 202310.2.3 Sintering Sintering is another critical step, because it deeply affects the final properties and the production cost of FDM-based inorganic components. . Sintering is a …
Cold sintering of yttria-stabilized cubic bismuth oxide: Conductivity and microstructural evolution of metastable grain boundaries …
Kosuke Tsuji, Thomas Herisson de Beauvoir, Arnaud Ndayishimiye, Ke Wang, Clive A. Randall; Cold sintering of yttria-stabilized cubic bismuth oxide: Conductivity and microstructural evolution of metastable grain boundaries with annealing. J. Appl. Phys. 7 December 2020; 128 (21): 215104.
Investigation of grain boundaries for abnormal grain growth in ...
Strontium titanate (SrTiO3) is widely used in electronic devices, and it is a model material for understanding the structural and dielectric properties of grain boundaries (GBs). In such materials, the GBs often play a dominant role in sintering and microstructural behavior. Abnormal grain growth (AGG) is a commonly observed …