Role of O 2p-Ti 3d orbital hybridization in dielectric and ferroelectric properties of barium zirconate titanate ceramics

Realization of High Energy Storage Performance in BaTiO3-Bi(Co0.5Zr0.5)O3 Thin Film through Defect Construction in an Amorphous Structure

“…Through domain engineering, constructing highly dynamic polar nanoregions successfully leads to a macroscopic FE-to-RFE transition, which will help in obtaining an ultrahigh W rec and E b ; however, it still inevitably produces hysteresis loss under a high electric field, making the η generally lower than 80%. Apart from W rec and E b , realizing an enhancement of η ensures the reduction of energy loss and the maintenance of service life for the dielectric capacitor in practical application; thus, achieving W rec and η collaborative optimization is of great significance. , For the widely used energy storage BaTiO 3 -based material with large polarization, after combining BaTiO 3 with high-polarization compound Bi­(Me)­O 3 (Me can be a single trivalent cation or two cations with an average valence of +3), the Ti sites will be occupied by ions with different valence and ionic radius, and the long-range ordered structure of the BaTiO 3 ferroelectric domain will be destroyed, forming a so-called “weakly coupled relaxation” state, , which significantly decreases the P r and improves the η. However, their low E b still limits further enhancement of W rec .…”

Band Gap Engineering and Lattice Distortion for Synergetic Tuning Optical Properties of NaNbO3 toward Enhanced Piezo-photocatalytic Activity

“…How to enlarge the absorption range of NaNbO 3 from UV to visible light to utilize the available sunlight to fulfill the desired catalytic efficiency is an interesting topic worth studying. The doping strategy is an effective method to reduce the band gap and also can increase the lattice distortion of materials to obtain better piezoelectric properties. − For example, Chao et al introduced La­(Mn 0.5 Ni 0.5 )­O 3 into NaNbO 3 by a standard solid-state reaction to reduce the band gap remarkably, thereby enhancing the optical absorption capacity . The manganese ion and nickel ion can be introduced into the B site of NaNbO 3 perovskite to enhance the stability of ferroelectricity, distort the original arrangement of the NbO 6 octahedron, and narrow the band gap, respectively, while La 3+ can be introduced into perovskite A site to adjust the intergranular phase. , Therefore, it is an efficient strategy for narrowing the band gap and increasing the lattice distortion of pure NaNbO 3 by introducing these three elements into NaNbO 3 .…”