Abstract
(Ba1−xSrx)(Co1/3Nb2/3)O3 (0 ≤ x ≤ 0.5) microwave dielectric ceramics had been prepared using the solid-state reaction method. The dense microstructures with small grains were obtained. All Sr2+ substituted samples exhibited the perovskite phase. The structure transition from cubic to hexagonal occurred with the increase of x, which led to higher degree of 1:2 ordered structure in the B site. The improved Q × f value was correlated monotonously with the ordering parameters S. The dielectric constant (ε r ) and the temperature coefficient of resonant frequency (τ f ) could be effectively tuned by tailoring x. A good combination of microwave dielectric properties was obtained for (Ba0.95Sr0.05)(Co1/3Nb2/3)O3 sintered at 1380 °C: ε r = 33.3, Q × f = 87,120 GHz, τ f = 4 ppm/°C.
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Acknowledgments
This work was supported by Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Scientific Innovation Research of College Graduate in Jiangsu province (Project No. CXLX13_403), the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure (Project No. SKL201309SIC) and Science and Technology Projects of Guangdong Province (Project No. 2011A091103002). College Industrialization Project of Jiangsu Province (JHB2012-12).
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Wang, Z., Huang, B., Wang, L. et al. Low loss (Ba1−xSrx)(Co1/3Nb2/3)O3 solid solution: phase evolution, microstructure and microwave dielectric properties. J Mater Sci: Mater Electron 26, 4273–4279 (2015). https://doi.org/10.1007/s10854-015-2978-3
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DOI: https://doi.org/10.1007/s10854-015-2978-3