Sintering behavior and microwave dielectric properties of Bi2O3–ZnO–Nb2O5-based ceramics sintered under air and N2 atmosphere (original) (raw)

The sintering behavior and dielectric properties of the monoclinic zirconolite-like structure compound Bi 2 (Zn 1/3 Nb 2/3) 2 O 7 (BZN) and Bi 2 (Zn 1/ 3 Nb 2/3Àx V x) 2 O 7 (BZNV, x = 0.001) sintered under air and N 2 atmosphere were investigated. The pure phase were obtained between 810 and 990 8C both for BZN and BZNV ceramics. The substitution of V 2 O 5 and N 2 atmosphere accelerated the densification of ceramics slightly. The influences on microwave dielectric properties from different atmosphere were discussed in this work. The best microwave properties of BZN ceramics were obtained at 900 8C under N 2 atmosphere with e r = 76.1, Q = 850 and Q f = 3260 GHz while the best properties of BZNV ceramics were got at 930 8C under air atmosphere with e r = 76.7, Q = 890 and Q f = 3580 GHz. The temperature coefficient of resonant frequency t f was not obviously influenced by the different atmospheres. For BZN ceramics the t f was À79.8 ppm/8C while t f is À87.5 ppm/8C for BZNV ceramics.