Microstructures and Microwave Dielectric Properties of Low-Temperature Fired Ca0.8Sr0.2TiO3-Li0.5Sm0 .5TiO3 Ceramics with Bi2O3-2B2O3 Addition

作者：Yuan, Changlai^*; Chen, Guohua; Yang, Tao; Liu, Fei; Zhou, Changrong; Yang, Yun

来源：Journal of Electronic Materials, 2015, 44(1): 263-270.

DOI：10.1007/s11664-014-3422-9

• Microwave ceramics
• dielectric properties
• microstructures
• low-temperature fired

The microstructures and microwave dielectric properties of xCa(0.8)Sr(0.2)TiO(3)-(1-x) Li0.5Sm0.5TiO3 (x = 0.25, 0.28, 0.3, 0.35 and 0.4) ceramics with about 20 wt.% Bi2O3-2B(2)O(3) (BB) addition were investigated. All the composite ceramics prepared using the conventional mixed oxide route consisted of a primarily orthorhombic perovskite xCa(0.8)Sr(0.2)TiO(3)-(1-x)Li0.5Sm0.5TiO3 solid-solution phase and minor secondary phases ascribed to LiBO2 and BiB3O6. It was found that the addition of 20 wt.% Bi2O3-2B(2)O(3) in xCa(0.8)Sr(0.2)TiO(3)-(1-x) Li0.5Sm0.5TiO3 (CSLSTx) phases decreased the optimal sintering temperature range to 1025-1050 degrees C. In the optimal sintering temperature range, the highest values of bulk density (rho), dielectric constant (epsilon(r)) and the product (Q.f) of quality factor (Q) and frequency (f) for the ceramics were obtained. With x increasing from 0.25 to 0.40, epsilon(r) increased from 94.9 to 116.6 and tau(f) from -14.76 ppm/degrees C to 100.2 ppm/degrees C, while Q.f value slightly increased from 1725 GHz to 1745 GHz and then decreased from 1745 GHz to 1541 GHz. For the 100 CSLSTx-20BBO ceramics sintered at 1025 degrees C, a near-zero tau(f) ceramic with epsilon(r) of 100 and Q.f value of 1737 GHz was obtained at x = 0.28.

• 出版日期2015-1
• 单位中南大学; 桂林电子科技大学