Origin of microwave dielectric loss in ZnNb2O6-TiO2

Dong Wan Kim; Kyung Hyun Ko; Do Kyun Kwon; Kug Sun Hong

doi:10.1111/j.1151-2916.2002.tb00240.x

Origin of microwave dielectric loss in ZnNb₂O₆-TiO₂

Dong Wan Kim^*
, Kyung Hyun Ko
, Do Kyun Kwon
, Kug Sun Hong

^*Corresponding author for this work

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

67 Citations (Scopus)

Abstract

(1-x)ZnNb₂O₆·xTiO₂ ceramics were prepared using both anatase and rutile forms of TiO₂. At a composition of x = 0.58, a mixture region of ixiolite (ZnTiNb₂O₈) and rutile was observed and the temperature coefficient of resonant frequency (τ_f) was ∼0 ppm/°C. We found that although ε_r and τ_f were comparable, the quality factor (Q × f, Q ≈ 1/tan δ,f = resonant frequency) of 0.42 ZnNb₂O₆·0.58 TiO₂ prepared from anatase and rutile was 6000 and 29 000, respectively. The origin of the difference in Q × f of both samples was investigated by measuring electrical conductivity and by analysis of the anatase-rutile phase transition. The anatase-derived sample had higher conductivity, which was related to the reduction of Ti⁴⁺. It is suggested that the increase of dielectric loss originates from an increase in Ti³⁺ and oxygen vacancies due to an anatase-rutile phase transition.

Original language	English
Pages (from-to)	1169-1172
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	85
Issue number	5
DOIs	https://doi.org/10.1111/j.1151-2916.2002.tb00240.x
Publication status	Published - 2002 May
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/j.1151-2916.2002.tb00240.x

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@article{079e7ab6036f43579207d7c0636c1386,

title = "Origin of microwave dielectric loss in ZnNb2O6-TiO2",

abstract = "(1-x)ZnNb2O6·xTiO2 ceramics were prepared using both anatase and rutile forms of TiO2. At a composition of x = 0.58, a mixture region of ixiolite (ZnTiNb2O8) and rutile was observed and the temperature coefficient of resonant frequency (τf) was ∼0 ppm/°C. We found that although εr and τf were comparable, the quality factor (Q × f, Q ≈ 1/tan δ,f = resonant frequency) of 0.42 ZnNb2O6·0.58 TiO2 prepared from anatase and rutile was 6000 and 29 000, respectively. The origin of the difference in Q × f of both samples was investigated by measuring electrical conductivity and by analysis of the anatase-rutile phase transition. The anatase-derived sample had higher conductivity, which was related to the reduction of Ti4+. It is suggested that the increase of dielectric loss originates from an increase in Ti3+ and oxygen vacancies due to an anatase-rutile phase transition.",

author = "Kim, \{Dong Wan\} and Ko, \{Kyung Hyun\} and Kwon, \{Do Kyun\} and Hong, \{Kug Sun\}",

year = "2002",

month = may,

doi = "10.1111/j.1151-2916.2002.tb00240.x",

language = "English",

volume = "85",

pages = "1169--1172",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

number = "5",

}

TY - JOUR

T1 - Origin of microwave dielectric loss in ZnNb2O6-TiO2

AU - Kim, Dong Wan

AU - Ko, Kyung Hyun

AU - Kwon, Do Kyun

AU - Hong, Kug Sun

PY - 2002/5

Y1 - 2002/5

N2 - (1-x)ZnNb2O6·xTiO2 ceramics were prepared using both anatase and rutile forms of TiO2. At a composition of x = 0.58, a mixture region of ixiolite (ZnTiNb2O8) and rutile was observed and the temperature coefficient of resonant frequency (τf) was ∼0 ppm/°C. We found that although εr and τf were comparable, the quality factor (Q × f, Q ≈ 1/tan δ,f = resonant frequency) of 0.42 ZnNb2O6·0.58 TiO2 prepared from anatase and rutile was 6000 and 29 000, respectively. The origin of the difference in Q × f of both samples was investigated by measuring electrical conductivity and by analysis of the anatase-rutile phase transition. The anatase-derived sample had higher conductivity, which was related to the reduction of Ti4+. It is suggested that the increase of dielectric loss originates from an increase in Ti3+ and oxygen vacancies due to an anatase-rutile phase transition.

AB - (1-x)ZnNb2O6·xTiO2 ceramics were prepared using both anatase and rutile forms of TiO2. At a composition of x = 0.58, a mixture region of ixiolite (ZnTiNb2O8) and rutile was observed and the temperature coefficient of resonant frequency (τf) was ∼0 ppm/°C. We found that although εr and τf were comparable, the quality factor (Q × f, Q ≈ 1/tan δ,f = resonant frequency) of 0.42 ZnNb2O6·0.58 TiO2 prepared from anatase and rutile was 6000 and 29 000, respectively. The origin of the difference in Q × f of both samples was investigated by measuring electrical conductivity and by analysis of the anatase-rutile phase transition. The anatase-derived sample had higher conductivity, which was related to the reduction of Ti4+. It is suggested that the increase of dielectric loss originates from an increase in Ti3+ and oxygen vacancies due to an anatase-rutile phase transition.

UR - https://www.scopus.com/pages/publications/0036573299

U2 - 10.1111/j.1151-2916.2002.tb00240.x

DO - 10.1111/j.1151-2916.2002.tb00240.x

M3 - Article

AN - SCOPUS:0036573299

SN - 0002-7820

VL - 85

SP - 1169

EP - 1172

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 5

ER -

Origin of microwave dielectric loss in ZnNb₂O₆-TiO₂

Abstract

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