A Theoretical Model on Size Effect of Dielectric Response in DC Bias Field in Barium Titanate Ceramic System

Abstract

Theoretical models of size effects in dielectric response according to DC bias field in submicrometer barium titanate ceramic system are discussed. The dielectric response contains two typical parts: intrinsic ferroelectric and the vibration of domain walls, and the total dielectric response is the summation of both. In this work, the size effects of the two parts are analyzed separately. With the combination of the two parts, a theoretical model on size effect in dielectric response in DC bias field is derived. Our research shows that finer grains help to decrease permittivity loss when a DC bias field is applied. Additionally, some commercial devices were measured to verify our model.

High Piezoelectricity in Eco-Friendly NaNbO3-Based Ferroelectric Relaxor Ceramics via Phase and Domain Engineering

“…The response of ε r to the electric field is mainly based on the contributions of domain wall density, domain wall movement, and spontaneous polarization. − Figure c shows the relationship between ε r and DC bias for NN-10BTS-1.5NS ceramics at different temperatures. It can be seen that ε r changes approximately linearly with DC bias voltage at temperatures ≥150 °C, which indicates that only the contribution of intrinsic ion polarization is present at this temperature, showing a paraelectric phase structure .…”

Temperature dependent local structure coherence of surface-modified BaTiO3 nanocubes

“…First-principles calculations have been widely invoked to explain experimental observations of grain size and interface effects in nanoscale ferroelectrics. 10,20–28 Several studies have been published specifically investigating the relationships between particle size and phase selection and transition behaviors in BaTiO 3 particles. 13,16,29–35 Smith et al , 29 studying spherical nanoparticles prepared solvothermally with narrow size distributions around 26, 45, and 70 nm, suggested an increasingly diffuse phase transition for smaller BaTiO 3 particles as evidenced by Raman spectroscopy and synchrotron XRD.…”

Electrical Properties of BaTiO3-Based Multilayer Ceramic Capacitors Sintered with Plasma-Treated Glass Powder

“…The BaTiO 3 -based oxides have been widely adopted as the dielectric materials for various electronic components, especially multilayer ceramic capacitors (MLCCs). [1][2][3][4][5][6] The state-of-the-art technology of MLCCs has been developed according to a universal capacitance (C) equation, C ¼ n" 0 kA=d; n is the number of active dielectric layers, " 0 is the vacuum permittivity, k is the dielectric constant, d is the thickness of the dielectric layer, and A is the electrode area. The dielectric layer thickness (d), one of the key parameters in MLCC, has been reduced to below 1 m to improve the volumetric efficiency, which consequently results in the increase in electric field experienced by the dielectric layer, and therefore a high possibility of premature failure.…”

“…The dielectric layer thickness (d), one of the key parameters in MLCC, has been reduced to below 1 m to improve the volumetric efficiency, which consequently results in the increase in electric field experienced by the dielectric layer, and therefore a high possibility of premature failure. [1][2][3][4][5][6][7][8][9] In the microstructure of the BaTiO 3 -based ceramic layer in MLCCs, less than 1 m thickness is composed of only several grains (depending on the grain size) and therefore, precise control of the microstructure is crucial in enhancing the reliability of MLCCs. It is known that the formation of coarse abnormal grains in the BaTiO 3 ceramics should be avoided in order to achieve a long lifetime under DC electrical loading.…”