Effect of SiO2/BaO ratio on sintering behavior, crystallization behavior, and properties of SrO–BaO–B2O3–SiO2 glass-ceramics.

SrO–BaO–B 2 O 3 –SiO 2 glass-ceramics with a high dielectric constant and low dielectric loss were prepared. The influence of the SiO 2 /BaO ratio on the sintering behavior, crystallization behavior, and properties were systematically investigated. The results showed that the increasing amount of liquid phase from increasing the SiO 2 /BaO ratio promoted sintering, resulting in an initial decrease in the sintering activation energy. However, the viscosity of the liquid phase continued to increase, leading to an increase in the sintering temperature and sintering activation energy when the SiO 2 /BaO ratio reached 0.90. As the SiO 2 /BaO ratio increased, the fraction of the primary phase BaSi 2 Al 2 O 8 increased, and its grains grew; the minor phase SrTiO 3 was suppressed, resulting in changes in the properties of the glass-ceramics. The sample with a SiO 2 /BaO ratio of 0.69, which was sintered at 850 °C for 10 min, showed excellent properties: a coefficient of thermal expansion (CTE) of 10.63 × 10−6 K−1 (25–500 °C), a dielectric constant (ϵ r) of 16.24 (1 MHz), a dielectric loss (tanδ) of 3.39 × 10−3 (1 MHz), a flexural strength of 138.80 MPa, and a quality loss of acid corrosion of 1.06 × 10−4 g mm−2. The results indicated that the SrO–BaO–B 2 O 3 –SiO 2 glass-ceramics used in this study have great potential for low-temperature co-fired ceramics applications. [ABSTRACT FROM AUTHOR]