Paul W. Rehrig

New High Temperature Morphotropic Phase Boundary Piezoelectrics Based on Bi(Me)O3–PbTiO3 Ceramics

New morphotropic phase boundary (MPB) piezoelectrics, with ferroelectric phase transition (Tc) exceeding that of PbZrO3–PbTiO3 (PZT), were investigated. Based on a perovskite tolerance factor-Tc relationship, new high Tc MPB systems were projected in the Bi(Me)O3–PbTiO3 system, where Me is a relatively large B+3-site cation. For the (1-x)BiScO3–(x)PbTiO3 solid solution, a MPB was found at x-0.64 separating the rhombohedral and tetragonal phases, with correspondingly enhanced dielectric and piezoelectric properties. A transition temperature Tc of ~ 450°C was determined with evidence of Tcs on the order of ≥ 600°C in the BiInO3 and BiYbO3 analogues, though issues of perovskite stability remain for the smaller tolerance end-member systems.

Piezoelectric properties of zirconium-doped barium titanate single crystals grown by templated grain growth

Single crystals of Ba(ZrxTi1−x)O3 were grown by templated grain growth (TGG). Millimeter size single crystals of Ba(ZrxTi1−x)O3 were produced by heating a BaTiO3 crystal in contact with a sintered polycrystalline matrix of 4.5, 5.0, or 8.5 mol % Zr-doped barium titanate for 30 h at 1350 °C. To facilitate boundary migration, the ceramic compact was made 3 mol % TiO2 excess. The 4.5 and 5.0 mol % Zr-doped crystals were orthorhombic at room temperature, and for a pseudocubic (001) orientation, they showed remanent polarizations of 13 μC/cm2 and a high field d33 of 340–355 pC/N. The 8.5 mol % Zr-doped crystal [again oriented along the pseudocubic (001)] was rhombohedral at room temperature with a remanent polarization of 10 μC/cm2. A k33 value of 0.74 from resonance measurements was observed for the 4.5 mol % Zr-doped crystal.

Neutron diffraction study of field-cooling effects on the relaxor ferroelectricPb[(Zn1/3Nb2/3)0.92Ti0.08]O3

High-temperature (high-

Crystal growth and electrical properties of Pb(Yb1/2Nb1/2)O3–PbTiO3 perovskite single crystals

T)

5I-1 Microfabrication of Piezoelectric Composite Ultrasound Transducers (PC-MUT)

and high-electric-field (high-

A small, linear, piezoelectric ultrasonic cryomotor

E)

Neutron Diffraction Study of the Irreversible R–MA–MC Phase Transition in Single Crystal Pb[(Zn1/3Nb2/3)1-xTix]O3

effects on

Electric-field-induced phase transitions in rhombohedral Pb ( Zn 1 / 3 Nb 2 / 3 ) 1 − x Ti x O 3

\mathrm{Pb}[({\mathrm{Zn}}_{1/3}{\mathrm{Nb}}_{2/3}{)}_{0.92}{\mathrm{Ti}}_{0.08}]{\mathrm{O}}_{3}

Electric-field-induced phase transitions in rhombohedral Pb(Zn1/3Nb2/3)1-xTixO3

were studied comprehensively by neutron diffraction in the ranges

Performance of single-crystal Pb(Mg1∕3Nb2∕3)-32%PbTiO3 stacked actuators with application to adaptive structures

300l~Tl~550\mathrm{K}