Sintering and microwave dielectric properties of Ba1−xCaxNi2V2O8 ceramics for LTCC applications

Low-temperature-sintered Ba 1− x Ca x Ni 2 V 2 O 8 ceramics were synthesized by the traditional solid-state sintering method. Ba 1− x Ca x Ni 2 V 2 O 8 compound crystallized into hexagonal BaNi 2 V 2 O 8 phase with space group of R-3. The effects of partial substitution of Ba 2+ by Ca 2+ on the densification, grain growth, microwave dielectric properties, crystalline phases, and microstructures of Ba 1− x Ca x Ni 2 V 2 O 8 ceramics were studied. The addition of calcium led to the precipitation of a new crystalline phase of Ca 5 Ni 4 (VO 4 ) 6 . The replacement can improve ceramics’ Q × f value but has a limited effect on τ f value. The Ba 0.8 Ca 0.2 Ni 2 V 2 O 8 ceramic sintered at 900 °C for 4 h showed the good microwave dielectric performances: ε r = 9.3, Q × f = 53,200 GHz, and τ f = -55.7 ppm/°C. The Ba 1− x Ca x Ni 2 V 2 O 8 ceramics can be a candidate material in LTCC technology.