The piezoelectric voltage constant (g33) is a material parameter critical to voltage-type sensors for detecting vibrations or strains. Here, we report lead-free (K,Na)NbO3 (KNN)-based accelerometer with sensitivity enhanced by taking advantage of high g33. To achieve g33, the magnitudes charge d33 and dielectric permittivity εr KNN were best coupled manipulating intrinsic polymorphic phase boun...

Herein, the systematic change in self-polarization behavior against post-heat treatment after film deposition was investigated to understand origin of hydrothermally prepared (KxNa1−x)NbO3 films with x = 0.88 at 240 °C below Curie temperature. The transverse piezoelectric constant, e31,f, evaluated by cantilever method. as-prepared and heat-treated 300 had an almost perfectly self-polarized sta...