Highly orientated Bi4Ti3O12 piezoceramics prepared by pressureless sintering

Bismuth titanate (Bi4Ti3O12) has great potential for applications over 400 °C owning to its great Curie temperature (TC ∼ 675 °C). But the relatively low piezoelectric constant d33 (< 8 pC/N) has restricted the practical high-temperature application. In this work, a new combination of the molten...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 41; no. 2; pp. 1244 - 1250
Main Authors Jiang, Dongwei, Zhou, Zhiyong, Liang, Ruihong, Dong, Xianlin
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2021
Subjects
Bi4Ti3O12 piezoceramics
Grain orientation
Molten salt
Pressureless sintering
Bi4Ti3O12 piezoceramics
Grain orientation
Pressureless sintering
Molten salt
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Summary:Bismuth titanate (Bi4Ti3O12) has great potential for applications over 400 °C owning to its great Curie temperature (TC ∼ 675 °C). But the relatively low piezoelectric constant d33 (< 8 pC/N) has restricted the practical high-temperature application. In this work, a new combination of the molten salt method and pressureless sintering was used to prepare textured Bi4Ti3O12 piezoceramics with a high degree of grain orientation (f = 0.83), large d33 (29.7 pC/N) with a comparatively high TC (628 °C). These demonstrate that the combination is a low cost, effective and simple way to achieve highly orientated BIT ceramics with excellent performance. The mechanism and origin of the grain orientation have been deeply investigated, and the compression pressure during the molding process is proposed to be the main driving force for grain orientation, which would be very helpful for guiding the design and fabrication of novel highly orientated materials.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.09.039