Invited Seminar by Prof. Tomoaki Karaki from Toyama Prefectural University
On 19th March, Prof. Tomoaki Karaki from Toyama Prefectural University(富山県立大学), Japan, invited by The Research Center of Information Functional Materials and Devices, delivered a talk entitled “High-Performance BaTiO3 Piezoelectric Ceramics Manufactured by Two-Step Sintering”. The research staff and students of SICCAS attended the seminar and showed great interest for the wonderful talk and vigorous discussions. Prof. Karaki is an alumnus of Shanghai Institute of Ceramics, who got Master Degree on Electronic Ceramics in 1985. His research areas are ferroelectric and piezoelectric ceramics and their applications including single crystal, thin films, ceramics, nano powders, SAW devices etc. Recently, He has achieved fine-grain barium titanate (BaTiO3) piezoelectric ceramics by two-step sintering technique. Under the optimal conditions, dense specimens had an average grain size of approximately 1.6 µm, and showed large dielectric constants and excellent piezoelectric properties. The large piezoelectric constant of d33 of 460 pC/N was obtained. These results indicated the possibility of applying lead-free BaTiO3 ceramics manufactured by a low-cost process to ultrasonic generators, actuators, piezoelectric vibrators, and sensors working at room temperature.
