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

Cheol Woo Ahn; Hyun Jung Jang; Sahn Nahm; Hyun Min Park; Hwack Joo Lee

doi:10.1016/S0955-2219(03)00151-1

Effects of microstructure on the microwave dielectric properties of Ba(Co_1/3Nb_2/3)O₃ and (1-x)Ba (Co_1/3Nb_2/3)O₃-xBa(Zn_1/3 Nb_2/3) O₃ ceramics

Cheol Woo Ahn, Hyun Jung Jang, Sahn Nahm, Hyun Min Park, Hwack Joo Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

Ba(Co_1/3Nb_2/3)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(Co_1/3 Nb_2/3)O₃-xBa(Zn_1/3Nb_2/3) 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 τ_f = 0.0 ppm/°C, ε_r = 34.5 and Q × f = 97,000 GHz were obtained for the 0.7BCN-0.3BZN ceramics sintered at 1400 °C for 20 h.

Original language	English
Pages (from-to)	2473-2478
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	23
Issue number	14
DOIs	https://doi.org/10.1016/S0955-2219(03)00151-1
Publication status	Published - 2003

Keywords

Dielectric properties
Microstructure-final
Niobates
Perovskite
Sintering

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1016/S0955-2219(03)00151-1

Cite this

Effects of microstructure on the microwave dielectric properties of Ba(Co_1/3Nb_2/3)O₃ and (1-x)Ba (Co_1/3Nb_2/3)O₃-xBa(Zn_1/3 Nb_2/3) O₃ ceramics. / Ahn, Cheol Woo; Jang, Hyun Jung; Nahm, Sahn; Park, Hyun Min; Lee, Hwack Joo.

In: Journal of the European Ceramic Society, Vol. 23, No. 14, 2003, p. 2473-2478.

Research output: Contribution to journal › Article › peer-review

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title = "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",

abstract = "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.",

keywords = "Dielectric properties, Microstructure-final, Niobates, Perovskite, Sintering",

author = "Ahn, {Cheol Woo} and Jang, {Hyun Jung} and Sahn Nahm and Park, {Hyun Min} and Lee, {Hwack Joo}",

note = "Funding Information: This work was partially supported by the Ministry of Education of Korea and one of authors acknowledged that this work was financially supported by Korean Ministry of Science and Technology through NRL Project.",

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doi = "10.1016/S0955-2219(03)00151-1",

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AU - Ahn, Cheol Woo

AU - Jang, Hyun Jung

AU - Nahm, Sahn

AU - Park, Hyun Min

AU - Lee, Hwack Joo

N1 - Funding Information: This work was partially supported by the Ministry of Education of Korea and one of authors acknowledged that this work was financially supported by Korean Ministry of Science and Technology through NRL Project.

PY - 2003

Y1 - 2003

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

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