Core–Shell Structure and Dielectric Properties of Ba0.991Bi0.006TiO3@Nb2O5–Co3O4 Ceramics |
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Authors: | Yu Liu Bin Cui Yan Wang Rong Ma Mengqian Shangguan Xiaotong Zhao Shuhao Wang Qianyu Li Yaoyu Wang |
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Affiliation: | 1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico‐Inorganic Chemistry, Department of Chemistry, Northwest University, Xi'an, China;2. Gaoxin No.1 High School, Xi'an, China |
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Abstract: | To meet the needs of future multilayer ceramic capacitors (MLCCs), thinner dielectric layers are necessary. To achieve this goal, the grain size and uniformity of the particles must be effectively controlled. In this study, we confirmed a core–shell particle structure by means of X‐ray diffraction, scanning electron microscopy, and energy‐dispersive spectroscopy. The dielectric properties of the ceramics were measured using an LCR meter. We found Ba0.991Bi0.006TiO3 particles form a core that was coated with a homogeneous Nb2O5–Co3O4 layer (~9 nm). The relationship between core–shell structure and εr‐T curves of the Ba0.991Bi0.006TiO3@Nb2O5–Co3O4 ceramics by different sintering temperature has been investigated. Dense, fine‐grained Ba0.991Bi0.006TiO@Nb2O5–Co3O4 ceramics were obtained by sintering at 1160°C. The ceramics met the X8R requirements, with a maximum dielectric constant of 2795, and a low dielectric loss at room temperature of 0.89%. |
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