Microstructure and dielectric properties of compositionally graded Ba1-xSrxTiO3 multilayer tunable capacitors

Hyun Ju Choi; Jong Un Woo; Hyun Gyu Hwang; Dae Su Kim; Mohan Sanghadasa; Sahn Nahm

doi:10.1016/j.jeurceramsoc.2020.12.027

Microstructure and dielectric properties of compositionally graded Ba_1-xSr_xTiO₃ multilayer tunable capacitors

Hyun Ju Choi, Jong Un Woo, Hyun Gyu Hwang, Dae Su Kim, Mohan Sanghadasa, Sahn Nahm

Department of Materials Science and Engineering

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

9 Citations (Scopus)

Abstract

Li₂O/B₂O₃-added Ba_1-xSr_xTiO₃ (B_1-xS_xT) ceramics, where 0.2 ≤ x ≤ 0.35, were well densified at 920 °C with pure perovskite structure. The dielectric constant, tunability, and figure of merit (FOM) of B_1-xS_xT ceramics increased with x because of the decreasing Curie temperature (T_C). The specimen with x = 0.35, whose T_C was close to room temperature, exhibited a large tunability of 27.4 % and FOM of 110 at 10 kV/cm. A compositionally graded multilayer (CGML), which was sintered at 920 °C, was fabricated using B_1-xS_xT thick films to produce a temperature-stable tunable capacitor, and it evinced a dense microstructure and a continuous interface between the B_1-xS_xT thick film and the Ag electrode. This CGML capacitor showed a large tunability (51 %) and FOM (150) at 20 kV/cm. It also exhibited stable tunability (17–28 % at 10 kV/cm) at temperatures between 30–90 °C. Therefore, the B_1-xS_xT CGML capacitor is a suitable candidate for temperature-stable tunable capacitors.

Original language	English
Pages (from-to)	2559-2567
Number of pages	9
Journal	Journal of the European Ceramic Society
Volume	41
Issue number	4
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2020.12.027
Publication status	Published - 2021 Apr

Bibliographical note

Funding Information:
This work was supported by the U.S. Army International Technology Center Pacific (ITC-PAC) under Contract No. (FA5209-17-C-0009). The authors also thank the KU-KIST graduate school program of Korea University.

Funding Information:
This work was supported by the U.S. Army International Technology Center Pacific (ITC-PAC) under Contract No. (FA5209-17-C-0009). The authors also thank the KU-KIST graduate school program of Korea University.

Publisher Copyright:
© 2020

Keywords

Ba1-xSrxTiO3
Graded multilayer ceramics
Low temperature co-fired ceramic
Tape casting
Temperature-stable tunable device

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2020.12.027

Cite this

@article{78e8f73857194c91803461772ed5ac4c,

title = "Microstructure and dielectric properties of compositionally graded Ba1-xSrxTiO3 multilayer tunable capacitors",

abstract = "Li2O/B2O3-added Ba1-xSrxTiO3 (B1-xSxT) ceramics, where 0.2 ≤ x ≤ 0.35, were well densified at 920 °C with pure perovskite structure. The dielectric constant, tunability, and figure of merit (FOM) of B1-xSxT ceramics increased with x because of the decreasing Curie temperature (TC). The specimen with x = 0.35, whose TC was close to room temperature, exhibited a large tunability of 27.4 % and FOM of 110 at 10 kV/cm. A compositionally graded multilayer (CGML), which was sintered at 920 °C, was fabricated using B1-xSxT thick films to produce a temperature-stable tunable capacitor, and it evinced a dense microstructure and a continuous interface between the B1-xSxT thick film and the Ag electrode. This CGML capacitor showed a large tunability (51 %) and FOM (150) at 20 kV/cm. It also exhibited stable tunability (17–28 % at 10 kV/cm) at temperatures between 30–90 °C. Therefore, the B1-xSxT CGML capacitor is a suitable candidate for temperature-stable tunable capacitors.",

keywords = "Ba1-xSrxTiO3, Graded multilayer ceramics, Low temperature co-fired ceramic, Tape casting, Temperature-stable tunable device",

author = "Choi, {Hyun Ju} and Woo, {Jong Un} and Hwang, {Hyun Gyu} and Kim, {Dae Su} and Mohan Sanghadasa and Sahn Nahm",

note = "Funding Information: This work was supported by the U.S. Army International Technology Center Pacific (ITC-PAC) under Contract No. (FA5209-17-C-0009). The authors also thank the KU-KIST graduate school program of Korea University. Funding Information: This work was supported by the U.S. Army International Technology Center Pacific (ITC-PAC) under Contract No. (FA5209-17-C-0009). The authors also thank the KU-KIST graduate school program of Korea University. Publisher Copyright: {\textcopyright} 2020",

year = "2021",

month = apr,

doi = "10.1016/j.jeurceramsoc.2020.12.027",

language = "English",

volume = "41",

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journal = "Journal of the European Ceramic Society",

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T1 - Microstructure and dielectric properties of compositionally graded Ba1-xSrxTiO3 multilayer tunable capacitors

AU - Choi, Hyun Ju

AU - Woo, Jong Un

AU - Hwang, Hyun Gyu

AU - Kim, Dae Su

AU - Sanghadasa, Mohan

AU - Nahm, Sahn

N1 - Funding Information: This work was supported by the U.S. Army International Technology Center Pacific (ITC-PAC) under Contract No. (FA5209-17-C-0009). The authors also thank the KU-KIST graduate school program of Korea University. Funding Information: This work was supported by the U.S. Army International Technology Center Pacific (ITC-PAC) under Contract No. (FA5209-17-C-0009). The authors also thank the KU-KIST graduate school program of Korea University. Publisher Copyright: © 2020

PY - 2021/4

Y1 - 2021/4

N2 - Li2O/B2O3-added Ba1-xSrxTiO3 (B1-xSxT) ceramics, where 0.2 ≤ x ≤ 0.35, were well densified at 920 °C with pure perovskite structure. The dielectric constant, tunability, and figure of merit (FOM) of B1-xSxT ceramics increased with x because of the decreasing Curie temperature (TC). The specimen with x = 0.35, whose TC was close to room temperature, exhibited a large tunability of 27.4 % and FOM of 110 at 10 kV/cm. A compositionally graded multilayer (CGML), which was sintered at 920 °C, was fabricated using B1-xSxT thick films to produce a temperature-stable tunable capacitor, and it evinced a dense microstructure and a continuous interface between the B1-xSxT thick film and the Ag electrode. This CGML capacitor showed a large tunability (51 %) and FOM (150) at 20 kV/cm. It also exhibited stable tunability (17–28 % at 10 kV/cm) at temperatures between 30–90 °C. Therefore, the B1-xSxT CGML capacitor is a suitable candidate for temperature-stable tunable capacitors.

AB - Li2O/B2O3-added Ba1-xSrxTiO3 (B1-xSxT) ceramics, where 0.2 ≤ x ≤ 0.35, were well densified at 920 °C with pure perovskite structure. The dielectric constant, tunability, and figure of merit (FOM) of B1-xSxT ceramics increased with x because of the decreasing Curie temperature (TC). The specimen with x = 0.35, whose TC was close to room temperature, exhibited a large tunability of 27.4 % and FOM of 110 at 10 kV/cm. A compositionally graded multilayer (CGML), which was sintered at 920 °C, was fabricated using B1-xSxT thick films to produce a temperature-stable tunable capacitor, and it evinced a dense microstructure and a continuous interface between the B1-xSxT thick film and the Ag electrode. This CGML capacitor showed a large tunability (51 %) and FOM (150) at 20 kV/cm. It also exhibited stable tunability (17–28 % at 10 kV/cm) at temperatures between 30–90 °C. Therefore, the B1-xSxT CGML capacitor is a suitable candidate for temperature-stable tunable capacitors.

KW - Ba1-xSrxTiO3

KW - Graded multilayer ceramics

KW - Low temperature co-fired ceramic

KW - Tape casting

KW - Temperature-stable tunable device

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