Sintering behavior and dielectric properties of KCa2Nb3O10 ceramics

Sang Hyo Kweon; Mir Im; Guifang Han; Jin Seong Kim; Sahn Nahm; Ji Won Choi; Seong Ju Hwang

doi:10.1016/j.jeurceramsoc.2012.11.017

Sintering behavior and dielectric properties of KCa₂Nb₃O₁₀ ceramics

Sang Hyo Kweon, Mir Im, Guifang Han, Jin Seong Kim, Sahn Nahm, Ji Won Choi, Seong Ju Hwang

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

15 Citations (Scopus)

Abstract

Dense KCa₂Nb₃O₁₀ (KCN) oxides were synthesized and their dielectric properties were investigated. A homogeneous KCN phase was formed in the specimen sintered above 1300°C, but a CaNb₂O₆ secondary phase was developed in the specimen sintered at 1400°C, as result of the evaporation of K₂O. The KCN oxides sintered at 1375°C showed a high relative density that was 97.1% of the theoretical density. Furthermore, liquid-phase-assisted abnormal grain growth occurred during sintering. The dielectric constant of this KCN oxide was 46, with a low dielectric loss of 0.9% at 100kHz; these values are smaller than those that were previously reported. Complex impedance analysis indicated that the resistivity of the KCN oxide was very low, probably as a result of the presence of K⁺ ions between the layers, and this could be the origin of the low-frequency dispersion of the KCN oxides.

Original language	English
Pages (from-to)	907-911
Number of pages	5
Journal	Journal of the European Ceramic Society
Volume	33
Issue number	5
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2012.11.017
Publication status	Published - 2013 May

Bibliographical note

Funding Information:
This work was supported by the Industrial Strategic Technology Development Program, 10041232, “Development of synthesis method of exfoliated inorganic nanosheets with a high dielectric constant of >300 and the corresponding thin films applicable for the fabrication of high performance MLCC” funded by the Ministry of Knowledge Economy (MKE, Korea) .

Keywords

Dielectrics
Layered perovskite
Low loss
Multilayer ceramic capacitor

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2012.11.017

Cite this

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title = "Sintering behavior and dielectric properties of KCa2Nb3O10 ceramics",

abstract = "Dense KCa2Nb3O10 (KCN) oxides were synthesized and their dielectric properties were investigated. A homogeneous KCN phase was formed in the specimen sintered above 1300°C, but a CaNb2O6 secondary phase was developed in the specimen sintered at 1400°C, as result of the evaporation of K2O. The KCN oxides sintered at 1375°C showed a high relative density that was 97.1% of the theoretical density. Furthermore, liquid-phase-assisted abnormal grain growth occurred during sintering. The dielectric constant of this KCN oxide was 46, with a low dielectric loss of 0.9% at 100kHz; these values are smaller than those that were previously reported. Complex impedance analysis indicated that the resistivity of the KCN oxide was very low, probably as a result of the presence of K+ ions between the layers, and this could be the origin of the low-frequency dispersion of the KCN oxides.",

keywords = "Dielectrics, Layered perovskite, Low loss, Multilayer ceramic capacitor",

author = "Kweon, {Sang Hyo} and Mir Im and Guifang Han and Kim, {Jin Seong} and Sahn Nahm and Choi, {Ji Won} and Hwang, {Seong Ju}",

note = "Funding Information: This work was supported by the Industrial Strategic Technology Development Program, 10041232, “Development of synthesis method of exfoliated inorganic nanosheets with a high dielectric constant of >300 and the corresponding thin films applicable for the fabrication of high performance MLCC” funded by the Ministry of Knowledge Economy (MKE, Korea) . ",

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doi = "10.1016/j.jeurceramsoc.2012.11.017",

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AU - Kweon, Sang Hyo

AU - Im, Mir

AU - Han, Guifang

AU - Kim, Jin Seong

AU - Nahm, Sahn

AU - Choi, Ji Won

AU - Hwang, Seong Ju

N1 - Funding Information: This work was supported by the Industrial Strategic Technology Development Program, 10041232, “Development of synthesis method of exfoliated inorganic nanosheets with a high dielectric constant of >300 and the corresponding thin films applicable for the fabrication of high performance MLCC” funded by the Ministry of Knowledge Economy (MKE, Korea) .

PY - 2013/5

Y1 - 2013/5

N2 - Dense KCa2Nb3O10 (KCN) oxides were synthesized and their dielectric properties were investigated. A homogeneous KCN phase was formed in the specimen sintered above 1300°C, but a CaNb2O6 secondary phase was developed in the specimen sintered at 1400°C, as result of the evaporation of K2O. The KCN oxides sintered at 1375°C showed a high relative density that was 97.1% of the theoretical density. Furthermore, liquid-phase-assisted abnormal grain growth occurred during sintering. The dielectric constant of this KCN oxide was 46, with a low dielectric loss of 0.9% at 100kHz; these values are smaller than those that were previously reported. Complex impedance analysis indicated that the resistivity of the KCN oxide was very low, probably as a result of the presence of K+ ions between the layers, and this could be the origin of the low-frequency dispersion of the KCN oxides.

AB - Dense KCa2Nb3O10 (KCN) oxides were synthesized and their dielectric properties were investigated. A homogeneous KCN phase was formed in the specimen sintered above 1300°C, but a CaNb2O6 secondary phase was developed in the specimen sintered at 1400°C, as result of the evaporation of K2O. The KCN oxides sintered at 1375°C showed a high relative density that was 97.1% of the theoretical density. Furthermore, liquid-phase-assisted abnormal grain growth occurred during sintering. The dielectric constant of this KCN oxide was 46, with a low dielectric loss of 0.9% at 100kHz; these values are smaller than those that were previously reported. Complex impedance analysis indicated that the resistivity of the KCN oxide was very low, probably as a result of the presence of K+ ions between the layers, and this could be the origin of the low-frequency dispersion of the KCN oxides.

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KW - Low loss

KW - Multilayer ceramic capacitor

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