Microwave Dielectric Properties of Bi2(Zn1/3Ta 2/3)2O7 Polymorphs

Hee Bum Hong; Dong Wan Kim; Kug Sun Hong

doi:10.1143/jjap.42.5172

Microwave Dielectric Properties of Bi₂(Zn_1/3Ta _2/3)₂O₇ Polymorphs

Hee Bum Hong, Dong Wan Kim, Kug Sun Hong

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

19 Citations (Scopus)

Abstract

Polymorphic phases of Bi₂(Zn_1/3Ta_2/3) ₂O₇ pyrochlore were studied. A metastable monoclinic structure was observed at temperatures below 950°C. This low-temperature phase possesses highly temperature-stable characteristics in the microwave frequency range (5-7 GHz) with a temperature coefficient of resonant frequency (τ_f) = -8.8ppm/°C. The addition of B₂O ₃ to Bi₂(Zn_1/3Ta_2/3) ₂O₇ significantly lowered the sintering temperature, to 850°C, without an associated structural transition. Low-temperature sintering mechanisms have been investigated using dilatometry and transmission electron microscopy. Bi₂(Zn_1/3Ta_2/3) ₂O₇ with 0.5 wt% B₂O₃ can be suitable for application in low-temperature cofired ceramics (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: quality factor (Q × f) = 3500 GHz at 6.7 GHz, dielectric constant (ε _r) = 63.9 and τ_f = -14.1 ppm/°C.

Original language	English
Pages (from-to)	5172-5175
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	42
Issue number	8
DOIs	https://doi.org/10.1143/jjap.42.5172
Publication status	Published - 2003 Aug
Externally published	Yes

Keywords

Bi(ZnTa)O
LTCC
Microwave dielectric properties
Polymorphs

ASJC Scopus subject areas

General Engineering
General Physics and Astronomy

Access to Document

10.1143/jjap.42.5172

Cite this

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title = "Microwave Dielectric Properties of Bi2(Zn1/3Ta 2/3)2O7 Polymorphs",

abstract = "Polymorphic phases of Bi2(Zn1/3Ta2/3) 2O7 pyrochlore were studied. A metastable monoclinic structure was observed at temperatures below 950°C. This low-temperature phase possesses highly temperature-stable characteristics in the microwave frequency range (5-7 GHz) with a temperature coefficient of resonant frequency (τf) = -8.8ppm/°C. The addition of B2O 3 to Bi2(Zn1/3Ta2/3) 2O7 significantly lowered the sintering temperature, to 850°C, without an associated structural transition. Low-temperature sintering mechanisms have been investigated using dilatometry and transmission electron microscopy. Bi2(Zn1/3Ta2/3) 2O7 with 0.5 wt% B2O3 can be suitable for application in low-temperature cofired ceramics (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: quality factor (Q × f) = 3500 GHz at 6.7 GHz, dielectric constant (ε r) = 63.9 and τf = -14.1 ppm/°C.",

keywords = "Bi(ZnTa)O, LTCC, Microwave dielectric properties, Polymorphs",

author = "Hong, {Hee Bum} and Kim, {Dong Wan} and Hong, {Kug Sun}",

year = "2003",

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doi = "10.1143/jjap.42.5172",

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AU - Hong, Hee Bum

AU - Kim, Dong Wan

AU - Hong, Kug Sun

PY - 2003/8

Y1 - 2003/8

N2 - Polymorphic phases of Bi2(Zn1/3Ta2/3) 2O7 pyrochlore were studied. A metastable monoclinic structure was observed at temperatures below 950°C. This low-temperature phase possesses highly temperature-stable characteristics in the microwave frequency range (5-7 GHz) with a temperature coefficient of resonant frequency (τf) = -8.8ppm/°C. The addition of B2O 3 to Bi2(Zn1/3Ta2/3) 2O7 significantly lowered the sintering temperature, to 850°C, without an associated structural transition. Low-temperature sintering mechanisms have been investigated using dilatometry and transmission electron microscopy. Bi2(Zn1/3Ta2/3) 2O7 with 0.5 wt% B2O3 can be suitable for application in low-temperature cofired ceramics (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: quality factor (Q × f) = 3500 GHz at 6.7 GHz, dielectric constant (ε r) = 63.9 and τf = -14.1 ppm/°C.

AB - Polymorphic phases of Bi2(Zn1/3Ta2/3) 2O7 pyrochlore were studied. A metastable monoclinic structure was observed at temperatures below 950°C. This low-temperature phase possesses highly temperature-stable characteristics in the microwave frequency range (5-7 GHz) with a temperature coefficient of resonant frequency (τf) = -8.8ppm/°C. The addition of B2O 3 to Bi2(Zn1/3Ta2/3) 2O7 significantly lowered the sintering temperature, to 850°C, without an associated structural transition. Low-temperature sintering mechanisms have been investigated using dilatometry and transmission electron microscopy. Bi2(Zn1/3Ta2/3) 2O7 with 0.5 wt% B2O3 can be suitable for application in low-temperature cofired ceramics (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: quality factor (Q × f) = 3500 GHz at 6.7 GHz, dielectric constant (ε r) = 63.9 and τf = -14.1 ppm/°C.

KW - Bi(ZnTa)O

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KW - Microwave dielectric properties

KW - Polymorphs

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