SrV2O6: An ultralow-firing microwave dielectric ceramic for LTCC applications

A novel ultralow-firing microwave dielectric ceramic SrV2O6 was prepared at 630 °C through the solid-state method. Phase evolution and crystal structure were analyzed by XRD and Raman spectroscopy. Results show that α-SrV2O6 and β-SrV2O6 phase coexisted when fired at lower temperatures (<500 °C), while a single α-SrV2O6 phase was obtained at 550 °C and remained stable up to 660 °C. Optimum microwave dielectric properties with a quality factor ∼23,200 GHz, a low dielectric constant ∼9.66, and a temperature coefficient of resonant frequency ∼−205 ppm/°C was obtained. SrV2O6 ceramic possessed chemical compatibility with aluminum electrodes when cofired at 630 °C. The temperature stability of SrV2O6 was adjusted by forming composite ceramics with CaTiO3 and a near-zero τf ∼−2.7 ppm/°C was achieved in the 0.75SrV2O6-0.25CaTiO3 ceramic. All the results show that the SrV2O6 ceramic might be a promising candidate as substrates in ultra-low temperature cofired (ULTCC) ceramics.