Crystal structure, dielectric properties of (K0.5Na0.5)NbO3single crystal grown by flux method using B2O3flux

Electrocaloric Effect of (K1-xNax)NbO₃ Single Crystal

The electrocaloric effect of (K_1-xNa_x)NbO₃ single crystal is calculated based on Landau-Devonshire theory. The electrocaloric coefficient and adiabatic temperature change are calculated with the variation of temperature in rhombohedral, orthorhombic and tetragonal phase. A maximum of electrocaloric coefficient is obtained in each ferroelectric phase. Moreover, the tetragonal phase presents the larger electrocaloric coefficient and adiabatic temperature change than that rhombohedral and orthorhombic phase. However, the large electrocaloric effect is also obtained at room temperature with the adiabatic temperature change of 0.5 K, which tallies with the experimental findings.

Lead-Free (K,Na)NbO3-Based Materials: Preparation Techniques and Piezoelectricity

This mini review focuses on the effect of preparation technologies on the piezoelectric property of KNN-based materials. The piezoelectric properties of KNN-based ceramics can be optimized by controlling the condition for sintering and poling processes. The preparation method of textured and single crystals could realize an increased piezoelectric constant compared to that of corresponding ceramics. According to current developments in preparation technology, we also provide perspectives and outlooks of lead-free KNN-based materials.

Orientation dependence of electrical properties of large-sized sodium potassium niobate lead-free single crystals

Large-sized sodium potassium niobate lead-free single crystals were successfully grown by a top seeded solution growth technique (TSSG).