Piezoelectric properties of layered perovskite A2Ti2O7 (A=La and Nd) single-crystal fibers

Lanthanum and neodymium titanate A2Ti2O7 (A=La, Nd) single-crystal fibers were grown via the laser-heated pedestal growth technique. The single-crystal fibers were 600 μm in diameter and 3–4 cm in length. The piezoelectric, k23 and d23, and elastic compliance, s33, coefficients were measured using the standard resonance-antiresonance technique. From a comparison of the measured coefficients to poled single crystal data in the literature, it is concluded that the La2Ti2O7 single-crystal fiber grew in a single domain state.