Enhanced Piezoelectric Properties of Barium Titanate-Potassium Niobate Solid Solution System Ceramics by MPB Engineering

Abstract:

Barium titanate (BaTiO3, BT) - potassium niobate (KNbO3, KN) solid solution system (0.5BT-0.5KN) ceramics with various microstructures were prepared by conventional sintering method and two-step sintering method using BT and KN nanoparticles. Their microstructures were investigated using X-ray diffraction (XRD) measurement and scanning electron microscopy (SEM), and it was confirmed that two ferroelectric phases, i.e., BT-rich tetragonal and KN-rich orthorhombic phases, always coexisted for all ceramics, which suggested that 0.5BT-0.5KN ceramics had “pseudo-morphotropic phase boundary (MPB)” structure. Thus, the control of the interface area between two phases was important to enhance piezoelectric property. Finally, their piezoelectric property was measured, and the apparent piezoelectric constant d33* increased with increasing interface area.

• Periodical: Key Engineering Materials (Volume 445)
• Pages: 11-14
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.445.11
• Online since: July 2010
• Authors: Shigehito Shimizu, Petr Pulpan, Nobuhiro Kumada, Daisuke Tanaka, Masahito Furukawa, Yoshihiro Kuroiwa, Tohru S. Suzuki, Tetsuo Uchikoshi, Satoshi Wada
• Keywords: Barium Titanate (BT), Interface Region, MPB Engineering, Piezoelectric Properties, Potassium Niobate

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