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Author Yu, Dan ♦ Zhao, Minglei ♦ Wang, Chunlei ♦ Wang, Lihai ♦ Su, Wenbin ♦ Gai, Zhigang ♦ Wang, Chunming ♦ Li, Jichao ♦ Zhang, Jialiang
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ AMORPHOUS STATE ♦ ANNEALING ♦ MELTING ♦ NANOCOMPOSITES ♦ PIEZOELECTRICITY ♦ PLASTICITY ♦ POLARIZATION ♦ RAMAN SPECTROSCOPY ♦ SINTERING ♦ TEMPERATURE GRADIENTS ♦ TEMPERATURE RANGE 0400-1000 K ♦ TITANATES ♦ X-RAY DIFFRACTION
Abstract Bulk Bi{sub 12}TiO{sub 20}-BaTiO{sub 3} (BTO-BT) nanocomposites are fabricated through the high-temperature interfacial reaction between nanometer-sized BaTiO{sub 3} particles and melting Bi{sub 12}TiO{sub 20}. Although the obtained BTO-BT nanocomposites are nearly amorphous and display very weak ferroelectricity, they exhibit relatively strong piezoelectricity without undergoing the electrical poling process. The volume fraction of crystalline Bi{sub 12}TiO{sub 20} is reduced to less than 10%, and the piezoelectric constant d{sub 33} is enhanced to 13 pC/N. Only the presence of the macroscopic polar amorphous phases can explain this unusual thermal stable piezoelectricity. Combining the results from X-ray diffraction, Raman spectroscopy, and thermal annealing, it can be confirmed that the formation of macroscopic polar amorphous phases is closely related to the inhomogeneous plastic deformation of the amorphous Bi{sub 12}TiO{sub 20} during the sintering process. These results highlight the key role of plastically deformed amorphous Bi{sub 12}TiO{sub 20} in the Bi{sub 12}TiO{sub 20}-based polar composites, and the temperature gradient driven coupling between the plastic strain gradient and polarization in amorphous phases is the main poling mechanism for this special type of bulk polar material.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-18
Publisher Place United States
Journal Applied Physics Letters
Volume Number 109
Issue Number 3


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