Abstract
The effects of a forming atmosphere on the stability, the sintering and the dielectric properties of Ba 5Nb 4O 15, BaNb 2O 6, ZnNb 2O 6 and Zn 3Nb 2O 8 ceramics were investigated, because of the primary importance of the sintering atmosphere in relation to copper sintering. These Nb-based materials were sintered in air and in Ar/H 210%. Zn-containing samples are very sensitive to the reductive atmosphere. ZnO volatilises at 800–850 °C and the resulting compound does not exhibit the expected properties. BaNb 2O 6 and Ba 5Nb 4O 15 are more stable in term of relative weight loss. Nevertheless, the phase analysis reveals a modification of the BaNb 2O 6 phase, what induces the degradation of the dielectric property stability versus temperature. The properties of Ba 5Nb 4O 15 are not modified by a sintering in reductive atmosphere. A relative permittivity of 38.8, a permittivity temperature coefficient of −150 ppm °C −1 and an insulating resistivity of 10 10.9 Ω cm were obtained for this latter.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
