Microwave dielectric properties of (1-x)Ba5Nb4O15-xBaNb2O6 mixtures

Dong Wan Kim; Hyuk Joon Youn; Kug Sun Hong; Chang Kyung Kim

doi:10.1143/jjap.41.3812

Microwave dielectric properties of (1-x)Ba₅Nb₄O₁₅-xBaNb₂O₆ mixtures

Dong Wan Kim, Hyuk Joon Youn, Kug Sun Hong, Chang Kyung Kim

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

22 Citations (Scopus)

Abstract

The mixture behavior and microwave dielectric properties of (1 - x)Ba₅Nb₄O₁₅-xBaNb₂O₆ ceramics were studied by means of X-ray powder diffraction and a network analyzer. 0.17Ba₅Nb₄O₁₅-0.83BaNb₂O₆ samples sintered at 1250°C for 2 h, exhibit excellent microwave dielectric properties: dielectric constant (ε_r) = 35.2, quality factor (Q × f) = 59300 GHz, and temperature coefficient of resonant frequency (τ_f) = 0 ppm/°C. The ε_r and τ_f of mixtures could be predicted by the appropriate mixing relation, but deviated slightly from calculated values. This was attributed to dissimilar microstructural grain morphologies of the Ba₅Nb₄O₁₅ and BaNb₂O₆ end members. In the mixtures, higher Q × f was obtained rather than Ba₅Nb₄O₁₅ and BaNb₂O₆, due to pore reduction. Also, the mixture behavior of low-fired Ba₅Nb₄O₁₅-BaNb₂O₆ was discussed. A major contributor to microwave dielectric properties of low-fired samples is the low temperature phase, hexagonal BaNb₂O₆.

Original language	English
Pages (from-to)	3812-3816
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	41
Issue number	6 A
DOIs	https://doi.org/10.1143/jjap.41.3812
Publication status	Published - 2002 Jun
Externally published	Yes

Keywords

BaNb O
BaNbO
Low-fired
Microwave dielectric properties
Mixture

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.41.3812

Cite this

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title = "Microwave dielectric properties of (1-x)Ba5Nb4O15-xBaNb2O6 mixtures",

abstract = "The mixture behavior and microwave dielectric properties of (1 - x)Ba5Nb4O15-xBaNb2O6 ceramics were studied by means of X-ray powder diffraction and a network analyzer. 0.17Ba5Nb4O15-0.83BaNb2O6 samples sintered at 1250°C for 2 h, exhibit excellent microwave dielectric properties: dielectric constant (εr) = 35.2, quality factor (Q × f) = 59300 GHz, and temperature coefficient of resonant frequency (τf) = 0 ppm/°C. The εr and τf of mixtures could be predicted by the appropriate mixing relation, but deviated slightly from calculated values. This was attributed to dissimilar microstructural grain morphologies of the Ba5Nb4O15 and BaNb2O6 end members. In the mixtures, higher Q × f was obtained rather than Ba5Nb4O15 and BaNb2O6, due to pore reduction. Also, the mixture behavior of low-fired Ba5Nb4O15-BaNb2O6 was discussed. A major contributor to microwave dielectric properties of low-fired samples is the low temperature phase, hexagonal BaNb2O6.",

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author = "Kim, {Dong Wan} and Youn, {Hyuk Joon} and Hong, {Kug Sun} and Kim, {Chang Kyung}",

year = "2002",

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AU - Youn, Hyuk Joon

AU - Hong, Kug Sun

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PY - 2002/6

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N2 - The mixture behavior and microwave dielectric properties of (1 - x)Ba5Nb4O15-xBaNb2O6 ceramics were studied by means of X-ray powder diffraction and a network analyzer. 0.17Ba5Nb4O15-0.83BaNb2O6 samples sintered at 1250°C for 2 h, exhibit excellent microwave dielectric properties: dielectric constant (εr) = 35.2, quality factor (Q × f) = 59300 GHz, and temperature coefficient of resonant frequency (τf) = 0 ppm/°C. The εr and τf of mixtures could be predicted by the appropriate mixing relation, but deviated slightly from calculated values. This was attributed to dissimilar microstructural grain morphologies of the Ba5Nb4O15 and BaNb2O6 end members. In the mixtures, higher Q × f was obtained rather than Ba5Nb4O15 and BaNb2O6, due to pore reduction. Also, the mixture behavior of low-fired Ba5Nb4O15-BaNb2O6 was discussed. A major contributor to microwave dielectric properties of low-fired samples is the low temperature phase, hexagonal BaNb2O6.

AB - The mixture behavior and microwave dielectric properties of (1 - x)Ba5Nb4O15-xBaNb2O6 ceramics were studied by means of X-ray powder diffraction and a network analyzer. 0.17Ba5Nb4O15-0.83BaNb2O6 samples sintered at 1250°C for 2 h, exhibit excellent microwave dielectric properties: dielectric constant (εr) = 35.2, quality factor (Q × f) = 59300 GHz, and temperature coefficient of resonant frequency (τf) = 0 ppm/°C. The εr and τf of mixtures could be predicted by the appropriate mixing relation, but deviated slightly from calculated values. This was attributed to dissimilar microstructural grain morphologies of the Ba5Nb4O15 and BaNb2O6 end members. In the mixtures, higher Q × f was obtained rather than Ba5Nb4O15 and BaNb2O6, due to pore reduction. Also, the mixture behavior of low-fired Ba5Nb4O15-BaNb2O6 was discussed. A major contributor to microwave dielectric properties of low-fired samples is the low temperature phase, hexagonal BaNb2O6.

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