New Potassium-Sodium Niobate Ceramics with a Giant d33

For potassium-sodium niobate, poor piezoelectric properties always perplex most researchers, and then it becomes important to attain a giant piezoelectricity. Here we reported a giant piezoelectric constant in (1 - x)(K0.48Na0.52)(Nb0.95Sb0.05)O-3-xBi(0.5)Ag(0.5)ZrO(3) lead-free ceramics. The rhombohedral-tetragonal phase boundary was shown in the ceramics with 0.04 < x <= 0.05, and then the ceramic with x = 0.0425 possesses a giant d(33) of similar to 490 pC/N. We also discussed the physical mechanisms of enhanced piezoelectricity. As a result, such a research can benefit the sustainable development of (K,Na)NbO3 materials.