Piezoelectric, electrical and energy harvesting properties of (Na_0.52K_0.443Li_0.037)(Nb_0.883Sb_0.08Ta_0.037)O₃ ceramics

Abstract

In this study, (Na,K,Li)(Nb,Sb,Ta)O₃ ceramics substituted with (Sr,Ca)ZrO₃ by conventional solid state method were manufactured and their dielectric and piezoelectric properties were investigated. The (Na,K,Li)(Nb,Sb,Ta)O₃ ceramics substituted with 0.01 (Sr,Ca)ZrO₃ showed excellent piezoelectric properties. The density(ρ), piezoelectric constant(d₃₃), and the piezoelectric voltage constant (g_33), planar piezoelectric coupling coefficient(k_p), mechanical quality factor(Q_m), and dielectric constant(ε_r) showed the excellent values of 4.55 g/cm³, 254pC/N, 26.17(×10⁻³ Vm/N) 0.46, 156, and 1096, respectively. The multilayer piezoelectric energy harvester was fabricated using the above composition ceramics by tape casting methods. When driving frequency was 80 Hz under gravity acceleration 1G, the multilayer energy harvester with the size of 30 mm ×3 mm ×1 mm showed the maximum output voltage of 1.1V at no load. And the maximum output power 3.28 µW of the harvester was also shown at the 50 Hz under gravity acceleration 1G.

Keywords:

• dielectric and piezoelectric properties
• piezoelectric constant (d₃₃)
• the piezoelectric voltage constant (g₃₃)
• planar piezoelectric coupling coefficient (k_p)
• mechanical quality factor (Q_m)