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http://dx.doi.org/10.6111/JKCGCT.2020.30.3.110

TCC behavior of a shell phase in core/shell structure formed in Y-doped BaTiO3: an individual observation  

Jeon, Sang-Chae (School of Materials Science and Engineering, Changwon National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.30, no.3, 2020 , pp. 110-116 More about this Journal
Abstract
Grains in the BaTiO3, which is used for a dielectric layer in MLCC(Multi-Layer Ceramic Capacitor) are necessary to form core/shell structure for a stable TCC(Temperature Coefficient of Capacitance) behavior. The shell property has been deduced from the whole TCC behavior of core/shell structure due to its tiny size, ~ few ㎛. This study demonstrates the individual TCC behavior of the shell phase measured by micro-contact measurement in a temperature range between 35 and 135℃. Pt electrode pairs deposited on an enlarged core/shell structure in a diffusion couple sample made the measurement possible. As a result, the DPT (Diffusion Phase Transition) behavior of the shell phase was revealed as a different TCC behavior from that of the core: a broad peak with Tm at 65℃. This would be also useful experimental data for a modelling that depicts dielectric-temperature behavior of core/shell structure.
Keywords
Multi-layer ceramic capacitor; $BaTiO_3$; Core/shell structure; Temperature coefficient of capacitance; Micro-contact measurement; Diffuse phase transition;
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