Piezoelectric Properties of a High Curie Temperature Pb(In_1/2Nb_1/2)O₃–PbTiO₃ Binary System Single Crystal near a Morphotropic Phase Boundary

Abstract

High-quality piezoelectric (1-x)Pb(In1/2Nb1/2)O3–xPbTiO3 binary system single crystals near a morphotropic phase boundary were successfully grown by a conventional flux method using PbO–PbF2–B2O3 flux. The largest crystal had dimensions of about 20 mm×10 mm×5 mm. The permittivity shows a shoulder at the ferroelectric rhombohedral to tetragonal phase transition temperature, T fr=100°C, and then has a maximum (35000 at 1 kHz) at the ferroelectric tetragonal to paraelectric cubic phase transition temperature, T c=260°C. The electromechanical coupling coefficient in rectangular bar mode, k 33 ′=78%, for phased array ultrasonic transducers was obtained by using the rhombohedral 0.72Pb(In1/2Nb1/2)O3–0.28PbTiO3 single crystal oriented along the [001] axis in the shape of a rectangular bar of 0.2 mm in width, 0.5 mm in thickness and 9 mm in length. The k 33 ′=78% is the highest value reported so far among all the piezoelectric materials with a T c more than 250°C.

Dielectric and ferroelectric properties of fine grains Pb(In1/2Nb1/2)O3–PbTiO3 ceramics

“…However, the major disadvantage of the two ceramic systems is relatively low Curie temperatures (T C ) of the morphotropic phase boundary (MPB) compositions, i.e. lower than 200 • C for the two systems [5][6][7][8]. This low T C comes with the expenses of more temperature dependent properties and less polarization stability, which in turn restrict the operating temperature range to less than 100 • C [7,8].…”

“…lower than 200 • C for the two systems [5][6][7][8]. This low T C comes with the expenses of more temperature dependent properties and less polarization stability, which in turn restrict the operating temperature range to less than 100 • C [7,8]. Interestingly, the MPB composition of the lead indium niobate-lead titanate ((1 − x)Pb(In 1/2 Nb 1/2 )O 3 -xPbTiO 3 or PIN-PT) solid solution system has been reported to possess T C higher than 250 • C [8][9][10][11][12][13], and therefore potential for high temperature applications.…”

Flux growth of La‐doped lead zirconate stannate titanate antiferroelectric crystals

“…The PLZST single crystals were grown by the high-temperature solution method using 50 wt% PbO-PbF 2 -B 2 O 3 [14] as flux. Powders with a composition of Pb 0.97 La 0.02 (Zr 0.66 Sn 0.27 Ti 0.07 )O 3 , reported near the MPB and possessing the highest longitudinal strain in ceramics, were prepared by the solid-state reaction and conventional calcining, using commercially available reagent-grade raw oxides, i.e., PbO, La 2 O 3 , ZrO 2 , SnO 2 and TiO 2 as starting materials.…”

Anomalous behavior of acoustic phonon and central peak in Pb[(In1/2Nb1/2)0.65Ti0.35]O3 single crystal

“…18 Recently PIN-PT solid solution system has generated a lot of interest due to the high electromechanical coupling factor k p along with high dielectric constant and high transition temperatures at MPB. 19,20 The phase diagram of ͑1−x͒PIN-xPT solid solution system shows the sequence of structural phases with temperature and PT content, and MPB is found to exist for x = 0.37. 21 The dielectric studies on the composition near MPB show cubic-tetragonal ͑T ct ͒ and tetragonal-rhombohedral ͑T tr ͒ phase transitions that are similar to PMN-PT and PZN-PT systems.…”