Domain engineered ⟨001⟩ oriented relaxor-PbTiO3 ferroelectric crystals exhibit high electromechanical properties and low mechanical Q values, analogous to “soft” piezoelectric ceramics. However, their characteristic low dielectric loss (≤0.5%) and strain-electric field hysteresis are reflective of “hard” piezoelectric materials. In this work, the electromechanical behavior of relaxor-PT crystals was investigated as a function of crystallographic orientations. It was found that the electrical and mechanical losses in crystals depends on the specific engineered domain configuration, with high Q observed for the ⟨110⟩ orientation. The high Q, together with high electromechanical coupling (∼0.9) for ⟨110⟩ oriented relaxor-PT crystals, make them promising candidates for resonant based high power transducer applications.
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