TY - JOUR
T1 - Dielectric properties and microstructure of BaTiO3-PTFE composites via cold sintering process
AU - Nunokawa, Takashi
AU - Takashima, Kenji
AU - Mizuno, Kotaro
AU - Randall, Clive A.
N1 - Publisher Copyright:
© 2024 The Author(s). Published on behalf of The Japan Society of Applied Physics by IOP Publishing Ltd.
PY - 2024/8/1
Y1 - 2024/8/1
N2 - The cold sintering process is capable of densifying ceramics and metal powders with other phases into composite materials without inducing chemical reactions between the constituent phases or causing the decomposition of any phases. In this study, we considered the co-sintering of BaTiO3 powders with polytetrafluoroethylene (PTFE) in the grain boundaries. We examined the microstructure and dielectric properties of these composites with different volume fractions of PTFE. The composites were highly dispersive from microstructure and general mixing laws, due to using fine PTFE. Transmission electron microscopy studies demonstrated that the thickness of the PTFE in the grain boundaries was determined with different volume fractions of PTFE. The cold-sintered BaTiO3 composites had high volume resistivity (>1011 Ω·cm), enhancing the resistivity of the cold-sintered pure BaTiO3 using Ba(OH)2·8H2O transient phase. Reliability tests, such as breakdown strength, and Jt curves, were conducted, and the reliability was improved by using fine powders of PTFE with controlled mixing.
AB - The cold sintering process is capable of densifying ceramics and metal powders with other phases into composite materials without inducing chemical reactions between the constituent phases or causing the decomposition of any phases. In this study, we considered the co-sintering of BaTiO3 powders with polytetrafluoroethylene (PTFE) in the grain boundaries. We examined the microstructure and dielectric properties of these composites with different volume fractions of PTFE. The composites were highly dispersive from microstructure and general mixing laws, due to using fine PTFE. Transmission electron microscopy studies demonstrated that the thickness of the PTFE in the grain boundaries was determined with different volume fractions of PTFE. The cold-sintered BaTiO3 composites had high volume resistivity (>1011 Ω·cm), enhancing the resistivity of the cold-sintered pure BaTiO3 using Ba(OH)2·8H2O transient phase. Reliability tests, such as breakdown strength, and Jt curves, were conducted, and the reliability was improved by using fine powders of PTFE with controlled mixing.
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U2 - 10.35848/1347-4065/ad6776
DO - 10.35848/1347-4065/ad6776
M3 - Article
AN - SCOPUS:85201402554
SN - 0021-4922
VL - 63
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
IS - 8
M1 - 08SP02
ER -