Dielectric and Piezoelectric Properties of Pb[(In1/2Nb1/2)0.24(Mg1/3Nb2/3)0.42Ti0.34]O3 Single Crystals

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The dielectric and piezoelectric properties of the 0.24Pb(In1/2Nb1/2)O3-0.42Pb(Mg1/3Nb2/3)-0.34PbTiO3 (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-B2O3 flux; the highest temperature was 1250°C and the growth rate was 0.4 mm/h. The Curie temperature, $T_{\text{c}}$, and the phase transition temperature between rhombohedral and tetragonal phases, $T_{\text{rt}}$, were 184°C and 89°C, respectively. The dielectric constant after poling, ${\varepsilon_{33}}^{T}/\varepsilon_{0} = 4{,}900$, electromechanical coupling factors for the sliver mode, ${k_{33}}'=80.3$%, piezoelectric constant, $d_{33}=2{,}200$ pC/N, and coercive field, $E_{\text{c}}=6.8$ kV/cm, were confirmed. Moreover, ${k_{33}}'$ was very stable until about 80°C because of the high $T_{\text{rt}}$.
2005-09-15