Flash sintering for BaTiO3 with square alternating current field including zero-field duration

The shrinkage behavior of barium titanate (BaTiO3) green compacts during flash sintering with a square alternating current (AC) field including a zero-field duration (AC-pulse wave) was investigated. It was found that an AC-pulse wave is effective for the densification of BaTiO3 green compacts witho...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2020/12/01, Vol.128(12), pp.1018-1023
Main Authors: UMEMURA, Ryosuke, TOKUNAGA, Tomoharu, YAMAMOTO, Takahisa
Format: Article
Language:English
Subjects:
Alternating current
Barium titanates
BaTiO3
Compacts
Densification
Discharge
Electron energy loss spectroscopy
Energy dissipation
Flash sintering
Microstructure
Polycrystals
Resistance sintering
Sintering
SrTiO3
Waveforms
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Summary:The shrinkage behavior of barium titanate (BaTiO3) green compacts during flash sintering with a square alternating current (AC) field including a zero-field duration (AC-pulse wave) was investigated. It was found that an AC-pulse wave is effective for the densification of BaTiO3 green compacts without reduction and discharge, which is confirmed by transmission electron microscopy and electron energy loss spectroscopy. BaTiO3 sintered polycrystal was obtained at a furnace temperature of 1000 °C by the optimal AC-pulse conditions of 285 V/cm at 250 Hz and a duty ratio of 30 %. A waveform with alternating polarity and the inclusion of a zero-field duration is shown to be possibly useful for flash sintering of oxide materials including altervalent cations.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.20181