Diffuse dielectric behaviour in Na0.5K0.5NbO3-LiTaO3-BiScO3 lead-free ceramics

► Novel solid-solution system investigated. ► Dielectric and piezoelectric properties dominated by chemical inhomogeneity effects. ► Phase-separation and core-shell, nanostructured grains identified by TEM-EDX. ► Piezoelectric charge coefficients of ∼200 pC/N.