TY - JOUR
T1 - High permittivity BaTiO3 and BaTiO3-polymer nanocomposites enabled by cold sintering with a new transient chemistry
T2 - Ba(OH)2∙8H2O
AU - Sada, Takao
AU - Tsuji, Kosuke
AU - Ndayishimiye, Arnaud
AU - Fan, Zhongming
AU - Fujioka, Yoshihiro
AU - Randall, Clive A.
N1 - Funding Information:
T.S would like to thank the Kyocera Corporation for Funding his Fellowship enabling his time as a visiting scientist at Penn State University . A.N, Z.F and C.A.R were partially supported from the AFOSR grant (grant no. FA9550-19-1-0372 ). We also wish to thank the staff of the MCL for aid in sample preparation, and in maintaining electrical measurement facilities.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/1
Y1 - 2021/1
N2 - Cold sintering process (CSP) offers a promising strategy for the fabrication of innovative and advanced high permittivity dielectric nanocomposite materials. Here, we introduce Ba(OH)2∙8H2O hydrated flux as a new transient chemistry that enables the densification of BaTiO3 in a single step at a temperature as low as 150 °C. This remarkably low temperature is near its Curie transition of 125 °C, associated with a displacive phase transition. The cold sintered BaTiO3 shows a relative density of 95 % and a room temperature relative permittivity over 1000. This new hydrated flux permits the fabrication of a unique dense BaTiO3-polymer nanocomposite with a high volume fraction of ceramics ((1-x) BaTiO3 – x PTFE, with x = 0.05). The composite exhibits a relative permittivity of approximately 800, at least an order of magnitude higher than previous reports on polymer composites with BaTiO3 nanoparticle fillers that are typically well below 100. Unique high permittivity dielectric nanocomposites with enhanced resistivities can now be designed using polymers to engineer grain boundaries and CSP as a processing method opening up new possibilities in dielectric materials design.
AB - Cold sintering process (CSP) offers a promising strategy for the fabrication of innovative and advanced high permittivity dielectric nanocomposite materials. Here, we introduce Ba(OH)2∙8H2O hydrated flux as a new transient chemistry that enables the densification of BaTiO3 in a single step at a temperature as low as 150 °C. This remarkably low temperature is near its Curie transition of 125 °C, associated with a displacive phase transition. The cold sintered BaTiO3 shows a relative density of 95 % and a room temperature relative permittivity over 1000. This new hydrated flux permits the fabrication of a unique dense BaTiO3-polymer nanocomposite with a high volume fraction of ceramics ((1-x) BaTiO3 – x PTFE, with x = 0.05). The composite exhibits a relative permittivity of approximately 800, at least an order of magnitude higher than previous reports on polymer composites with BaTiO3 nanoparticle fillers that are typically well below 100. Unique high permittivity dielectric nanocomposites with enhanced resistivities can now be designed using polymers to engineer grain boundaries and CSP as a processing method opening up new possibilities in dielectric materials design.
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U2 - 10.1016/j.jeurceramsoc.2020.07.070
DO - 10.1016/j.jeurceramsoc.2020.07.070
M3 - Article
AN - SCOPUS:85089445271
SN - 0955-2219
VL - 41
SP - 409
EP - 417
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 1
ER -