Effects of chemical ordering and homogeneity on microwave dielectric properties of LaGaO3-SrTiO3 compounds

Mingyu Kim; Tauseef Ahmed; Jung Hyun Lee; Donghyun Kim; Hyo Tae Kim; Ga Yeon Lee; Dong Hun Yeo; Soonil Lee

doi:10.1016/j.ceramint.2023.02.079

Effects of chemical ordering and homogeneity on microwave dielectric properties of LaGaO₃-SrTiO₃ compounds

Mingyu Kim
, Tauseef Ahmed
, Jung Hyun Lee
, Donghyun Kim
, Hyo Tae Kim
, Ga Yeon Lee
, Dong Hun Yeo
, Soonil Lee^*

^*Corresponding author for this work

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

11 Scopus citations

Abstract

(1-x)LaGaO₃-xSrTiO₃ (x = 0–0.6) microwave dielectric ceramics were synthesized by using conventional solid-state reaction method and sintered at 1450 °C with different sintering conditions. The variations of microstructure, relative density, and phase formation were observed by different composition and sintering conditions. The microwave properties, such as permittivity/dielectric constant (ε_r), quality factor (Q_f), and temperature coefficient of resonant frequency (TCF, τ_f) at a high frequency were investigated in terms of lattice distortion, chemical ordering, and chemical homogeneity according to the composition and equilibrium sintering conditions. A maximum Q_f ∼64,900 GHz was observed at x = 0, and the best τ_f ∼ 0 ppm/^°C was obtained at x = 0.4. Consequently, it was found that the permittivity is related mainly to the lattice distortion, whereas the quality factor is primarily affected by chemical ordering and chemical homogeneity of the microstructure-induced composition.

Original language	English
Pages (from-to)	17158-17165
Number of pages	8
Journal	Ceramics International
Volume	49
Issue number	11
DOIs	https://doi.org/10.1016/j.ceramint.2023.02.079
State	Published - 1 Jun 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd and Techna Group S.r.l.

Keywords

Chemical ordering
Lattice distortion
Microwave dielectrics
Permittivity
Quality factor
RF Filter

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2023.02.079

Cite this

@article{3af342909e7f411aa378d26d89287678,

title = "Effects of chemical ordering and homogeneity on microwave dielectric properties of LaGaO3-SrTiO3 compounds",

abstract = "(1-x)LaGaO3-xSrTiO3 (x = 0{\textendash}0.6) microwave dielectric ceramics were synthesized by using conventional solid-state reaction method and sintered at 1450 °C with different sintering conditions. The variations of microstructure, relative density, and phase formation were observed by different composition and sintering conditions. The microwave properties, such as permittivity/dielectric constant (εr), quality factor (Qf), and temperature coefficient of resonant frequency (TCF, τf) at a high frequency were investigated in terms of lattice distortion, chemical ordering, and chemical homogeneity according to the composition and equilibrium sintering conditions. A maximum Qf ∼64,900 GHz was observed at x = 0, and the best τf ∼ 0 ppm/°C was obtained at x = 0.4. Consequently, it was found that the permittivity is related mainly to the lattice distortion, whereas the quality factor is primarily affected by chemical ordering and chemical homogeneity of the microstructure-induced composition.",

keywords = "Chemical ordering, Lattice distortion, Microwave dielectrics, Permittivity, Quality factor, RF Filter",

author = "Mingyu Kim and Tauseef Ahmed and Lee, \{Jung Hyun\} and Donghyun Kim and Kim, \{Hyo Tae\} and Lee, \{Ga Yeon\} and Yeo, \{Dong Hun\} and Soonil Lee",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd and Techna Group S.r.l.",

year = "2023",

month = jun,

day = "1",

doi = "10.1016/j.ceramint.2023.02.079",

language = "English",

volume = "49",

pages = "17158--17165",

journal = "Ceramics International",

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TY - JOUR

T1 - Effects of chemical ordering and homogeneity on microwave dielectric properties of LaGaO3-SrTiO3 compounds

AU - Kim, Mingyu

AU - Ahmed, Tauseef

AU - Lee, Jung Hyun

AU - Kim, Donghyun

AU - Kim, Hyo Tae

AU - Lee, Ga Yeon

AU - Yeo, Dong Hun

AU - Lee, Soonil

PY - 2023/6/1

Y1 - 2023/6/1

N2 - (1-x)LaGaO3-xSrTiO3 (x = 0–0.6) microwave dielectric ceramics were synthesized by using conventional solid-state reaction method and sintered at 1450 °C with different sintering conditions. The variations of microstructure, relative density, and phase formation were observed by different composition and sintering conditions. The microwave properties, such as permittivity/dielectric constant (εr), quality factor (Qf), and temperature coefficient of resonant frequency (TCF, τf) at a high frequency were investigated in terms of lattice distortion, chemical ordering, and chemical homogeneity according to the composition and equilibrium sintering conditions. A maximum Qf ∼64,900 GHz was observed at x = 0, and the best τf ∼ 0 ppm/°C was obtained at x = 0.4. Consequently, it was found that the permittivity is related mainly to the lattice distortion, whereas the quality factor is primarily affected by chemical ordering and chemical homogeneity of the microstructure-induced composition.

AB - (1-x)LaGaO3-xSrTiO3 (x = 0–0.6) microwave dielectric ceramics were synthesized by using conventional solid-state reaction method and sintered at 1450 °C with different sintering conditions. The variations of microstructure, relative density, and phase formation were observed by different composition and sintering conditions. The microwave properties, such as permittivity/dielectric constant (εr), quality factor (Qf), and temperature coefficient of resonant frequency (TCF, τf) at a high frequency were investigated in terms of lattice distortion, chemical ordering, and chemical homogeneity according to the composition and equilibrium sintering conditions. A maximum Qf ∼64,900 GHz was observed at x = 0, and the best τf ∼ 0 ppm/°C was obtained at x = 0.4. Consequently, it was found that the permittivity is related mainly to the lattice distortion, whereas the quality factor is primarily affected by chemical ordering and chemical homogeneity of the microstructure-induced composition.

KW - Chemical ordering

KW - Lattice distortion

KW - Microwave dielectrics

KW - Permittivity

KW - Quality factor

KW - RF Filter

UR - https://www.scopus.com/pages/publications/85149823982

U2 - 10.1016/j.ceramint.2023.02.079

DO - 10.1016/j.ceramint.2023.02.079

M3 - Article

AN - SCOPUS:85149823982

SN - 0272-8842

VL - 49

SP - 17158

EP - 17165

JO - Ceramics International

JF - Ceramics International

IS - 11

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