Niobate perovskites like the (K,Na)NbO3 (KNN) family are among most important lead-free ferroelectrics. Ba and Ni have been co-doped into KNN to induce Ni2+-oxygen vacancy defect dipoles significantly reduce band gap while maintaining ferroelectricity. This opens doors novel optoferroelectric applications such as multisensors photocatalysts. However, obtaining a single phase of above is difficu...

The piezo-photovoltaic effect has been recently proposed as an analogy of the flexo-photovoltaic in noncentrosymmetric ferroelectrics that are also piezoelectric nature. It demonstrated to boost photovoltaic performance under applied uniaxial mechanical loads. impact on ferroelectric domains, however, not yet studied. In this context, a nanoscale insight into well optomechanical control domains...

Mn-added (K,Na)NbO3-based composite lead-free piezoelectric ceramic containing KTiNbO5 phase was fabricated for potential application to high-power fields. The resulting with 2 mol % MnO2 exhibited properties (mechanical quality factor Qm = 650, constant d33 140 pC/N, electromechanical coupling coefficient kp 0.42, dielectric ε33T/ε0 750, loss tan δ 0.5 %), and adequate heat resistance (Curie t...