期刊
MATERIALS
卷 15, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/ma15082875
关键词
MgO; BaTiO3; dielectric property; microstructure
类别
资金
- Hebei Province Science and Technology Support Program [19274009D]
- National Natural Science Foundation of China [51601056]
- Natural Science Foundation of Hebei Province of China [E2017202012]
In this study, composite ceramics of BST-MgO were prepared, and significant improvements in the dielectric constant and dielectric loss were observed with MgO doping. The Curie temperature also showed a shift, providing new solutions for further improving the dielectric properties of the BT-MgO system.
Barium titanate (BaTiO3, BT) is the main raw material of multilayer ceramic capacitors. As thinner layers of dielectric elements require smaller BT grain diameters, BT-MgO composites have been widely studied owing to the plasticity of MgO and its inhibition of grain growth. However, further improvements of the dielectric properties of the BT-MgO system are still urgently needed. Herein, composite ceramics of Ba0.7Sr0.3Ti0.9925Tm0.01O3 (BST)-x mol% MgO (x = 1, 2, 3, 4, 5) were prepared. The dielectric constant of BST-1 mol% MgO at room temperature was approximately 3800, which was 1/3 times higher than that of BT-MgO composite ceramics. The dielectric loss was less than 0.004 and 2/3 that of BT-MgO composite ceramics. The Curie temperature of BST doped with MgO was below 0 degrees C. The anomalous increase in dielectric constant was caused by the co-doping of Sr and Tm with BT, while the reduced dielectric loss was due to the uniform dispersion of MgO at grain boundaries, which hinders grain growth. The Curie temperature shift was mainly due to accumulated oxygen vacancies. Thus, this work provides new solutions to further improve the dielectric properties of the BT-MgO system, including changing the doping elements and adjusting the doping ratio.
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