Synthesis and effect of Ba2+ ions on the dielectric properties of the layered-perovskite KSr2NaNb4O13 ceramics

Mir Im; Dong Ha Kim; Sang Hyo Kweon; Woong Hee Lee; Sahn Nahm

doi:10.1016/j.materresbull.2018.04.056

Synthesis and effect of Ba²⁺ ions on the dielectric properties of the layered-perovskite KSr₂NaNb₄O₁₃ ceramics

Mir Im, Dong Ha Kim, Sang Hyo Kweon, Woong Hee Lee, Sahn Nahm

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

The 25 mol% K₂O-added K(Sr₂Na)Nb₄O₁₃ ceramic sintered at 1275 °C exhibited a pure and dense K(Sr₂Na)Nb₄O₁₃ phase, which had four octahedral layers. Synthesis of a pure K(Sr₂Na)Nb₄O₁₃ ceramic was not possible without excess K₂O, due to the formation of a Na-deficient K(Sr₂Na₂)Nb₅O₁₆ secondary phase, because of K₂O evaporation during sintering. The dielectric constant (ε_r) of the K(Sr₂Na)Nb₄O₁₃ ceramic was 43.8 at 100 kHz, two times higher compared to the KSr₂Nb₃O₁₀ ceramic, which has three octahedral layers. The increased ε_r can be explained by the increased number of octahedral layers. Some of the Sr²⁺ ions in K(Sr₂Na)Nb₄O₁₃ ceramic were replaced by Ba²⁺ ions, which have high ionic polarizability, to further increase ε_r. The 25 mol% K₂O-excess K(Sr_0.8Ba_0.2)₂NaNb₄O₁₃ ceramic sintered at 1250 °C showed a high ε_r of 67.4 at 100 kHz, which can be explained by the increased dipole moments and distortion of the NbO₆ octahedra.

Original language	English
Pages (from-to)	246-252
Number of pages	7
Journal	Materials Research Bulletin
Volume	105
DOIs	https://doi.org/10.1016/j.materresbull.2018.04.056
Publication status	Published - 2018 Sep 1

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Dielectric properties

Perovskite

dielectric properties

ceramics

Ions

Dipole moment

synthesis

ions

Evaporation

Permittivity

Sintering

perovskite

sintering

dipole moments

evaporation

permittivity

Keywords

Dion-Jacobson (DJ) phase
High-κ dielectrics
Inorganic nanosheets
K(SrNa)NbO compound
Layered perovskite

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

Im, M., Kim, D. H., Kweon, S. H., Lee, W. H., & Nahm, S. (2018). Synthesis and effect of Ba²⁺ ions on the dielectric properties of the layered-perovskite KSr₂NaNb₄O₁₃ ceramics. Materials Research Bulletin, 105, 246-252. https://doi.org/10.1016/j.materresbull.2018.04.056

Synthesis and effect of Ba²⁺ ions on the dielectric properties of the layered-perovskite KSr₂NaNb₄O₁₃ ceramics. / Im, Mir; Kim, Dong Ha; Kweon, Sang Hyo; Lee, Woong Hee; Nahm, Sahn.

In: Materials Research Bulletin, Vol. 105, 01.09.2018, p. 246-252.

Research output: Contribution to journal › Article

Im, M, Kim, DH, Kweon, SH, Lee, WH & Nahm, S 2018, 'Synthesis and effect of Ba²⁺ ions on the dielectric properties of the layered-perovskite KSr₂NaNb₄O₁₃ ceramics', Materials Research Bulletin, vol. 105, pp. 246-252. https://doi.org/10.1016/j.materresbull.2018.04.056

Im M, Kim DH, Kweon SH, Lee WH, Nahm S. Synthesis and effect of Ba²⁺ ions on the dielectric properties of the layered-perovskite KSr₂NaNb₄O₁₃ ceramics. Materials Research Bulletin. 2018 Sep 1;105:246-252. https://doi.org/10.1016/j.materresbull.2018.04.056

Im, Mir ; Kim, Dong Ha ; Kweon, Sang Hyo ; Lee, Woong Hee ; Nahm, Sahn. / Synthesis and effect of Ba²⁺ ions on the dielectric properties of the layered-perovskite KSr₂NaNb₄O₁₃ ceramics. In: Materials Research Bulletin. 2018 ; Vol. 105. pp. 246-252.

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title = "Synthesis and effect of Ba2+ ions on the dielectric properties of the layered-perovskite KSr2NaNb4O13 ceramics",

abstract = "The 25 mol{\%} K2O-added K(Sr2Na)Nb4O13 ceramic sintered at 1275 °C exhibited a pure and dense K(Sr2Na)Nb4O13 phase, which had four octahedral layers. Synthesis of a pure K(Sr2Na)Nb4O13 ceramic was not possible without excess K2O, due to the formation of a Na-deficient K(Sr2Na2)Nb5O16 secondary phase, because of K2O evaporation during sintering. The dielectric constant (εr) of the K(Sr2Na)Nb4O13 ceramic was 43.8 at 100 kHz, two times higher compared to the KSr2Nb3O10 ceramic, which has three octahedral layers. The increased εr can be explained by the increased number of octahedral layers. Some of the Sr2+ ions in K(Sr2Na)Nb4O13 ceramic were replaced by Ba2+ ions, which have high ionic polarizability, to further increase εr. The 25 mol{\%} K2O-excess K(Sr0.8Ba0.2)2NaNb4O13 ceramic sintered at 1250 °C showed a high εr of 67.4 at 100 kHz, which can be explained by the increased dipole moments and distortion of the NbO6 octahedra.",

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N2 - The 25 mol% K2O-added K(Sr2Na)Nb4O13 ceramic sintered at 1275 °C exhibited a pure and dense K(Sr2Na)Nb4O13 phase, which had four octahedral layers. Synthesis of a pure K(Sr2Na)Nb4O13 ceramic was not possible without excess K2O, due to the formation of a Na-deficient K(Sr2Na2)Nb5O16 secondary phase, because of K2O evaporation during sintering. The dielectric constant (εr) of the K(Sr2Na)Nb4O13 ceramic was 43.8 at 100 kHz, two times higher compared to the KSr2Nb3O10 ceramic, which has three octahedral layers. The increased εr can be explained by the increased number of octahedral layers. Some of the Sr2+ ions in K(Sr2Na)Nb4O13 ceramic were replaced by Ba2+ ions, which have high ionic polarizability, to further increase εr. The 25 mol% K2O-excess K(Sr0.8Ba0.2)2NaNb4O13 ceramic sintered at 1250 °C showed a high εr of 67.4 at 100 kHz, which can be explained by the increased dipole moments and distortion of the NbO6 octahedra.

AB - The 25 mol% K2O-added K(Sr2Na)Nb4O13 ceramic sintered at 1275 °C exhibited a pure and dense K(Sr2Na)Nb4O13 phase, which had four octahedral layers. Synthesis of a pure K(Sr2Na)Nb4O13 ceramic was not possible without excess K2O, due to the formation of a Na-deficient K(Sr2Na2)Nb5O16 secondary phase, because of K2O evaporation during sintering. The dielectric constant (εr) of the K(Sr2Na)Nb4O13 ceramic was 43.8 at 100 kHz, two times higher compared to the KSr2Nb3O10 ceramic, which has three octahedral layers. The increased εr can be explained by the increased number of octahedral layers. Some of the Sr2+ ions in K(Sr2Na)Nb4O13 ceramic were replaced by Ba2+ ions, which have high ionic polarizability, to further increase εr. The 25 mol% K2O-excess K(Sr0.8Ba0.2)2NaNb4O13 ceramic sintered at 1250 °C showed a high εr of 67.4 at 100 kHz, which can be explained by the increased dipole moments and distortion of the NbO6 octahedra.

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10.1016/j.materresbull.2018.04.056