- title:A New Lead-free Piezoelectric BiFeO3-BaTiO3
Ceramics System

1. prof. Tae Kwon Song
(Department of Convergence Materials Science and Engineering, Changwon National University)

2. Abstract
Lead-free piezoelectric materials have been studied to replace the commonly used
lead zirconate titanate (PZT) because of environmental and health issues. Piezoelectric
properties are usually inversely proportional to the phase transition Curie temperature (TC),
but PZT is an exception that has good piezoelectric properties with a high TC. Here we show
that a bismuth ferrite (BF) and barium titanate (BT) solid solution system can achieve good
piezoelectric properties with a high TC when fabricated with low-temperature sintering
followed by a water-quenching process, with no complicated grain alignment processes
performed. By adding the super-tetragonal compound of bismuth gallium oxide, the
piezoelectric properties were equal to that of PZT ceramics and exhibited good long-term
reliabilities.

3.grape 설명
Figure 1 Piezoelectric properties (d33) and Curie temperatures (TC) of various piezoceramics.

4.* Time : 16:00 on Mar 10 (Thur)
* Location : Engineering Building 1, E207
* Contact : Prof. Wook Jo
wookjo@unist.ac.kr (2347)