The reversible phase transition and dielectric properties of BaNb2O6 polymorphs

Dong Wan Kim; Hee Bum Hong; Kug Sun Hong; Chang Kyung Kim; Deug Joong Kim

doi:10.1143/jjap.41.6045

The reversible phase transition and dielectric properties of BaNb₂O₆ polymorphs

Dong Wan Kim, Hee Bum Hong, Kug Sun Hong, Chang Kyung Kim, Deug Joong Kim

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

25 Citations (Scopus)

Abstract

Barium metaniobate, BaNb₂O₆ with polymorphic orthorhombic and hexagonal forms was prepared by solid-state reaction. Hexagonal BaNb₂O₆ is the low temperature phase, and can be transformed to the orthorhombic phase over a broad temperature range above 1150°C. It was observed that the hexagonal-to-orthorhombic phase transition is reversible due to the structural similarity of these two polymorphs. The difference in transition kinetics and associated mechanisms could be confirmed from the analysis of time dependence of transformed phase. We also found the dielectric properties of each phase to be significantly different. In particular, orthorhombic BaNb₂O₆ has good microwave dielectric properties: Q × f = 43,000 GHz, ε_r = 30, τ_f = -45ppm/°C.

Original language	English
Pages (from-to)	6045-6048
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	41
Issue number	10
DOIs	https://doi.org/10.1143/jjap.41.6045
Publication status	Published - 2002 Oct
Externally published	Yes

Keywords

BaNbO
Dielectric properties
Microwave
Phase transition
Reversible

ASJC Scopus subject areas

General Engineering
General Physics and Astronomy

Access to Document

10.1143/jjap.41.6045

Cite this

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title = "The reversible phase transition and dielectric properties of BaNb2O6 polymorphs",

abstract = "Barium metaniobate, BaNb2O6 with polymorphic orthorhombic and hexagonal forms was prepared by solid-state reaction. Hexagonal BaNb2O6 is the low temperature phase, and can be transformed to the orthorhombic phase over a broad temperature range above 1150°C. It was observed that the hexagonal-to-orthorhombic phase transition is reversible due to the structural similarity of these two polymorphs. The difference in transition kinetics and associated mechanisms could be confirmed from the analysis of time dependence of transformed phase. We also found the dielectric properties of each phase to be significantly different. In particular, orthorhombic BaNb2O6 has good microwave dielectric properties: Q × f = 43,000 GHz, εr = 30, τf = -45ppm/°C.",

keywords = "BaNbO, Dielectric properties, Microwave, Phase transition, Reversible",

author = "Kim, {Dong Wan} and Hong, {Hee Bum} and Hong, {Kug Sun} and Kim, {Chang Kyung} and Kim, {Deug Joong}",

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T1 - The reversible phase transition and dielectric properties of BaNb2O6 polymorphs

AU - Kim, Dong Wan

AU - Hong, Hee Bum

AU - Hong, Kug Sun

AU - Kim, Chang Kyung

AU - Kim, Deug Joong

PY - 2002/10

Y1 - 2002/10

N2 - Barium metaniobate, BaNb2O6 with polymorphic orthorhombic and hexagonal forms was prepared by solid-state reaction. Hexagonal BaNb2O6 is the low temperature phase, and can be transformed to the orthorhombic phase over a broad temperature range above 1150°C. It was observed that the hexagonal-to-orthorhombic phase transition is reversible due to the structural similarity of these two polymorphs. The difference in transition kinetics and associated mechanisms could be confirmed from the analysis of time dependence of transformed phase. We also found the dielectric properties of each phase to be significantly different. In particular, orthorhombic BaNb2O6 has good microwave dielectric properties: Q × f = 43,000 GHz, εr = 30, τf = -45ppm/°C.

AB - Barium metaniobate, BaNb2O6 with polymorphic orthorhombic and hexagonal forms was prepared by solid-state reaction. Hexagonal BaNb2O6 is the low temperature phase, and can be transformed to the orthorhombic phase over a broad temperature range above 1150°C. It was observed that the hexagonal-to-orthorhombic phase transition is reversible due to the structural similarity of these two polymorphs. The difference in transition kinetics and associated mechanisms could be confirmed from the analysis of time dependence of transformed phase. We also found the dielectric properties of each phase to be significantly different. In particular, orthorhombic BaNb2O6 has good microwave dielectric properties: Q × f = 43,000 GHz, εr = 30, τf = -45ppm/°C.

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