TY - JOUR
T1 - Effects of microstructure on the microwave dielectric properties of Ba(Co1/3Nb2/3)O3 and (1-x)Ba (Co1/3Nb2/3)O3-xBa(Zn1/3 Nb2/3) O3 ceramics
AU - Ahn, Cheol Woo
AU - Jang, Hyun Jung
AU - Nahm, Sahn
AU - Park, Hyun Min
AU - Lee, Hwack Joo
PY - 2003/1/1
Y1 - 2003/1/1
N2 - Ba(Co1/3Nb2/3)O3(BCN) has a 1:2 ordered hexagonal structure. A large amount of the liquid phase, which contains high concentrations of Ba and Nb ions was found in the BCN ceramics. Q-values of BCN increased with increasing sintering temperature; however, it significantly decreased when the sintering temperature exceeded 1400 °C. The presence of a large amount of liquid phase could be responsible for the decrease of the Q-value. For (1 - x)Ba(Co1/3 Nb2/3)O3-xBa(Zn1/3Nb2/3) O3[(1 - x)BCN-xBZN] ceramics, the 1:2 ordered hexagonal structure was observed in the specimens with x ≤ 0.3 and the BaNb6O16 second phase was found in the specimens with x ≥ 0.6. Grain growth, which is related to the BaNb6 O16 second phase occurred in the specimens with x ≥ 0.5. In this work, the excellent microwave dielectric properties of τf = 0.0 ppm/°C, εr = 34.5 and Q × f = 97,000 GHz were obtained for the 0.7BCN-0.3BZN ceramics sintered at 1400 °C for 20 h.
AB - Ba(Co1/3Nb2/3)O3(BCN) has a 1:2 ordered hexagonal structure. A large amount of the liquid phase, which contains high concentrations of Ba and Nb ions was found in the BCN ceramics. Q-values of BCN increased with increasing sintering temperature; however, it significantly decreased when the sintering temperature exceeded 1400 °C. The presence of a large amount of liquid phase could be responsible for the decrease of the Q-value. For (1 - x)Ba(Co1/3 Nb2/3)O3-xBa(Zn1/3Nb2/3) O3[(1 - x)BCN-xBZN] ceramics, the 1:2 ordered hexagonal structure was observed in the specimens with x ≤ 0.3 and the BaNb6O16 second phase was found in the specimens with x ≥ 0.6. Grain growth, which is related to the BaNb6 O16 second phase occurred in the specimens with x ≥ 0.5. In this work, the excellent microwave dielectric properties of τf = 0.0 ppm/°C, εr = 34.5 and Q × f = 97,000 GHz were obtained for the 0.7BCN-0.3BZN ceramics sintered at 1400 °C for 20 h.
KW - Dielectric properties
KW - Microstructure-final
KW - Niobates
KW - Perovskite
KW - Sintering
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U2 - 10.1016/S0955-2219(03)00151-1
DO - 10.1016/S0955-2219(03)00151-1
M3 - Article
AN - SCOPUS:0041689624
VL - 23
SP - 2473
EP - 2478
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 14
ER -