By Toshio Ogawa

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Figure 8. Distributions of longitudinal wave velocity (VL) and transverse wave velocities (VS/L and VS/W) in PMNT70/30 single-crystal plates. Figures 9 and 10 show distributions of Y (in this case also YL = YW) and σ (σL = σW), and further, G (GL = GW) and K (KL = KW) in the plates of Nos. 1–6. Although the fluctuation of Y, σ, G, and K (ΔY, Δσ, ΔG and ΔK) in Nos. 1–4 is much smaller than the ΔY, Δσ, ΔG, and ΔK in Nos. 5 and 6. Figure 11 shows distributions of d33 in the plates of Nos. 1–6, the schematic domain alignments in the case of Nos.

Ceram. Soc. 1995; 78: 3352– 3356. : New York, 1993. ISBN-13: 978–0486673868 [12] Koelzynski A, Tkacz-Smiech K: From the molecular picture to the band structure of cubic and tetragonal barium titanate. Ferroelectrics. 2005; 314: 123–134. 1080/00150190590926300 [13] Egerton L, Dillon DM: Piezoelectric and dielectric properties of ceramics in the system potassium-sodium niobate. J. Am. Ceram. Soc. 1959. 42; 438–42. 1111/j. x 39 40 Piezoelectric Materials [14] Cross LE: Electric double hysteresis in (KxNa1−x)NbO3 single crystals.

1–6, the schematic domain alignments in the case of Nos. 2 and 5, and contribution of εa (εr of a-axis direction) and εc (εr of c-axis direction) to εr. The reason higher d33 was obtained in the plates of Nos. 5 and 6 composed of oriented domain alignment is due to higher εr affected by εa (εa > εc) under the Figure 9. Distributions of Young’s modulus (YL and YW) and Poisson’s ratio (σL and σW) in PMNT70/30 single-crystal plates. 49 50 Piezoelectric Materials condition of same kt’s. On the contrary, the plates of Nos.

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