The piezoelectric properties of SrBi₄Ti₄O₁₅-Na_0.5Bi_4.5Ti₄O₁₅ solid solution

To improve the piezoelectric properties of SrBi₄Ti₄O₁₅ ceramics, the (Na_0.5Bi_0.5) was selected as the substitute for Sr site and the Sr_1-x (Na_0.5Bi_0.5) _x Bi₄Ti₄O₁₅ (x = 0.00, 0.10, 0.20, 0.30, 0.40) ceramics were synthesized by the conventional solid-state reaction method. Considering the similar parameter of Na, Bi and the Sr element, the single phase showed in the x-ray Diffraction patterns should be SBT-NBT solid solution. The excellent piezoelectric properties were obtained for Sr_1-x (Na_0.5Bi_0.5) _x Bi₄Ti₄O₁₅ ceramics (x = 0.10) sintered at 1000°C for 3 h: ε ₃₃ ^T /ε ₀= 196, d ₃₃ = 20 pC/N, tanδ = 0.28%, T _C = 575°C. Under the premise of not severely deteriorating the T _C , compared with the Na_0.5Bi_4.5Ti₄O₁₅ and SrBi₄Ti₄O₁₅, the Sr_0.9(Na_0.5Bi_0.5)_0.1Bi₄Ti₄O₁₅ materials are promising candidates for high-temperature applications.