Ultra-high piezoelectric properties and ultra-high Curie temperature of Li/Ce-doped LaTiO ceramics.

The demand for ultra-high-temperature piezoelectric sensors in industrial applications has witnessed a rapid upsurge. In this study, the piezoelectric properties of LaTiO (LTO) piezoelectric ceramics with a perovskite-like layered structure were enhanced by doping with Li/Ce ions. It was found that a remarkable 300% enhancement in the piezoelectric constant () value was achieved in Li/Ce-doped LTO ceramics compared to their pristine counterparts, reaching 6.

Hardening Effect on the Electromechanical Properties of KNN-Based Ceramics Using a Composite Approach.

The high mechanical quality factor () of KNN-based ceramics is usually achieved by acceptor doping. However, this hardening effect has serious limitations due to the increased mobility of oxygen vacancies under large electric fields and hence is difficult to use in high-power applications. In this work, the hardening mechanism is demonstrated by the development composites of the 0.

Utilization of Nonstoichiometric Nb to Optimize Comprehensive Electrical Properties of KNN-Based Ceramics.

An easy approach is suggested to obtain excellent piezoelectric performances in potassium sodium niobate (KNN)-based ceramics simultaneously with low dielectric loss (tanδ), high Curie temperature (), and electromechanical coupling factor (). Herein, a KNN-based ceramics system with nonstoichiometric Nb is designed. Excessive Nb occupying the B-site significantly influences the microstructural features and electrical properties of KNN-based ceramics.

Spinel-Layered Intergrowth Composite Cathodes for Sodium-Ion Batteries.

The vital challenge of a layered manganese oxide cathode for sodium-ion batteries is its severe capacity degradation and sluggish ion diffusion kinetics caused by irreversible phase transitions. In response to this problem, the spinel-layered manganese-based composite with an intergrowth structure is ingeniously designed by virtue of an interesting spinel-to-layered transformation in the delithiated LiMnO under Na insertion. This unique spinel-layered intergrowth structure is strongly confirmed by combining multiple structure analysis techniques.

O3-Type Layered Ni-Rich Oxide: A High-Capacity and Superior-Rate Cathode for Sodium-Ion Batteries.

Inspired by its high-active and open layered framework for fast Li extraction/insertion reactions, layered Ni-rich oxide is proposed as an outstanding Na-intercalated cathode for high-performance sodium-ion batteries. An O3-type Na Ni Co Mn O is achieved through a facile electrochemical ion-exchange strategy in which Li ions are first extracted from the LiNi Co Mn O cathode and Na ions are then inserted into a layered oxide framework. Furthermore, the reaction mechanism of layered Ni-rich oxide during Na extraction/insertion is investigated in detail by combining ex situ X-ray diffraction, X-ray photoelectron spectroscopy, and electron energy loss spectroscopy.