大口径高変换効率圧电単结晶PMN-PT.PDF

JFE No. 8 – 20056 p. 43 48 PMN-PT Development of Large Diameter Piezo-single Crystal PMN-PT of High Energy Transfer Efficiency MATSUSHITA Mitsuyoshi JFE TACHI Yoshihito JFE IWASAKI Yosuke JFE 80mmφ PMN-PT) Ti PZT Abstract: The variation of titanium concentration is inevitable due to the segregation along the growth direction of a large PMN-PT piezoelectric single crystal with 80 mm in diameter grown by the Bridgman method using one-batch. Ti distribution along with the growth direction and the dependence of dielectric and piezoelectric properties on Ti concentration have been investigated. It is concluded that these properties which strongly depend on Ti concentration are superior to those of usual PZT(Pb(Zr, Ti)O ) ceramics. It is also observed that the dielectric and piezoelectric properties vary even with the same Ti concentration. In 3 order to make uniform Ti concentration, it is necessary to develop the growth method by continuous feeding. And optimization of poling conditions and the development of a domain control technique need to be developed to keep dielectric and piezoelectric properties within the desirable range. 3,4) 1. BaTiO 3 5) PZT PbZr Ti O 0.450.48x x x 1 3 Fig. 1 6)