Creating mesocrystalline ferroelectric nanocomposites and verification of their enormous piezoelectric and dielectric responses
Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Date (from‐to) : 2014/04 -2017/03
Author : FENG Qi; KUSUNOSE Takafumi
In the present study, mesocrystalline ferroelectric nanocomposites constructed from tow-kinds of nanocrystals with same crystal-axis orientation were synthesized by using our original soft chemical process, and their ferroelectric, dielectric, and piezoelectric behaviors were studied. We have succeeded in the syntheses of some ferroelectric mesocrystalline nanocomposites, such as BaTiO3/SiTiO3, BaTiO3/CaTiO3, BaTiO3/(Bi0.5Na0.5)TiO3, and SrTiO3/(Bi0.5Na0.5)TiO3 for the first time. The nanostructural, ferroelectric, dielectric, and piezoelectric studies revealed that 7 times and 5 times of enhanced piezoelectric and dielectric responses, respectively, were achieved by introduction of the lattice strain at the heteroepitaxial interface between two-kinds of the nanocrystals in the mesocrystalline nanocomposites. These results reveal that the enormous piezoelectric and dielectric responses can be induced by the lattice strain at the heteroepitaxial interface using the strain engineering.