Abstract
The largest Pb(In 1/2Nb 1/2)O 3–PbTiO 3(PIN-PT) binary system single crystal (about 20 mmx10 mm×5 mm, 4.5 g) near the morphotropic phase boundary composition with well-developed (1 0 0) planes was grown by the flux method using PbO–PbF 2–B 2O 3 flux. The PIN-PT(72/28) single crystal was found by simultaneous microdifferential thermal analysis and thermogravimetric analysis to show a peritectic melting at 1283°C with a partial decomposition of the perovskite crystal into a pyrochlore phase, followed by a liquidus point at 1294°C. The electromechanical coupling coefficient in rectangular bar mode, k 33′=78%, for phased array ultrasonic transducers was obtained by using the rhombohedral PIN-PT(72/28) single crystal oriented along the [0 0 1] axis. k 33′=78% is the highest value reported so far among all the piezoelectric materials with a T c>250°C and is almost independent of temperature, and even at 200°C decreased only by about 5%. The piezoelectric constant d 33=700pC/N was obtained. The relative permittivity Đ r decreases after poling. For instance, the Đ r value of 2650 before poling, decreases to 1500 after poling.
Published Version
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