Flash sintering of tunable dielectric Ba0.6Sr0.4TiO3 electroceramics

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abstract

Ba(1-x)SrxTiO3 (BST) is a crucial dielectric material in tunable devices for modern wireless communication technologies, owing to high dielectric tunability and low dielectric loss. However, the conventional processing of BST ceramics requires a high sintering temperature of about 1350 degrees C. In this work, we demonstrate the feasibility of using Flash sintering (FS) and corresponding maps to process Ba0.6Sr0.4TiO3 ceramics, resulting in a 350 degrees C decrease in sintering temperature and 7 h reduction in sintering process time. The Flash-sintered BST exhibits a finer grain microstructure, lower dielectric loss, and significantly higher K-factor (figure of merit for tunability) when compared to conventionally sintered BST, unequivocally meeting the application criteria for tunable materials. Our findings highlight the effectiveness of FS as an alternative method for the rapid sintering of BST, while also opening up possibilities for further research into more efficient sintering processes for electroceramics.

keywords

ENERGY-STORAGE PROPERTIES; GRAIN-SIZE; DOPED CERIA; MICROSTRUCTURE; DENSIFICATION; CONDUCTIVITY; TEMPERATURE; DEPENDENCE; GRADIENTS; BEHAVIOR

subject category

Materials Science

authors

Ribeiro, C; Tkach, A; Zorro, F; Ferreira, P; Costa, ME; Vilarinho, PM

our authors

foto Maria Elisabete Jorge Vieira Costa

Maria Elisabete Jorge Vieira Costa

Collaborator
foto Oleksandr Tkach

Oleksandr Tkach

Principal Researcher
foto Paula Maria Lousada Silveirinha Vilarinho

Paula Maria Lousada Silveirinha Vilarinho

Vice Director

Groups

G2 - Photonic, Electronic and Magnetic Materials

Projects

CICECO - Aveiro Institute of Materials (UIDB/50011/2020)

CICECO - Aveiro Institute of Materials (UIDP/50011/2020)

Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)

acknowledgements

Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed national funds through the FCT/MEC (PIDDAC) . Camila Ribeiro knowledges FCT for the Ph.D. grant (2020.09855.BD) support. Alexander Tkach acknowledges FCT for financial support under independent researcher grant 2021.02284.CEECIND/CP1659/CT0018 (DOI 10.544 99/2021.02284.CEECIND/CP1659/CT0018) .

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Publication Details

type
Journal Article
year
2024
journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
volume
44
article number
116761
publisher
ELSEVIER SCI LTD
issn
0955-2219
isbn
1873-619X
issue
15
digital object identifier
10.1016/j.jeurceramsoc.2024.116761
link
hybrid
web of science article identifier
WOS:001281427900001

Journal Metrics (JCR 2019)

Journal Impact Factor
4.495
Journal Impact Factor (5 yrs)
4.283
category normalized journal percentile
98.214

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