Dielectric and Piezoelectric Properties of Pb[(In_1/2Nb_1/2)_0.24(Mg_1/3Nb_2/3)_0.42Ti_0.34]O₃ Single Crystals

Abstract

The dielectric and piezoelectric properties of the 0.24Pb(In 1/2 Nb 1/2 )O 3 -0.42Pb(Mg 1/3 Nb 2/3 )-0.34PbTiO 3 (PIMNT 24/42/34) ternary system was investigated in order to improve thermal stability and voltage-proof nature of electrical properties. A PIMNT 24/42/34 single crystal 25 mm in diameter and 30 mm in length was successfully grown by the solution Bridgman method using PbO-B 2 O 3 flux; the highest temperature was 1250°C and the growth rate was 0.4 mm/h. The Curie temperature, T c , and the phase transition temperature between rhombohedral and tetragonal phases, T rt , were 184°C and 89°C, respectively. The dielectric constant after poling, ε 33 T / ε 0 = 4,900, electromechanical coupling factors for the sliver mode, k 33 '=80.3%, piezoelectric constant, d 33 =2,200 pC/N, and coercive field, E c =6.8 kV/cm, were confirmed. Moreover, k 33 ' was very stable until about 80°C because of the high T rt .