Antiferroelectric NaNbO3 ceramics prepared by hydrothermal-assisted cold sintering process

Abstract

A hydrothermal-assisted cold sintering process is developed for preparing antiferroelectric NaNbO 3 ceramic. The novel process includes hydrothermal synthesizing NaNbO 3 particles, cold sintering, and annealing. The physical and electrical properties of the cold sintered ceramics were studied comprehensively and compared with ceramics prepared by conventional sintering techniques. At optimum conditions, dense ceramic can be prepared by the cold sintering process with very low heat treatment temperature, and the properties are comparable with that prepared by conventional sintering.

K0.5Na0.5NbO3 ceramics fabricated by combining cold sintering with annealing in air atmosphere or low pO2 atmosphere

“…With an increase in the applied uniaxial pressure from 400 to 800 MPa, the ρ r values of CSP samples and post‐annealed ceramics increase monotonously (Figure 1b,d). An increase in the uniaxial pressure helps increasing the densities, which has also been observed in other systems 28–30 . The ρ r values of the post‐annealed ceramics prepared with the liquid content of 15 wt% under 800 MPa are the highest.…”

“…An increase in the uniaxial pressure helps increasing the densities, which has also been observed in other systems. [28][29][30] The ρ r values of the post-annealed ceramics prepared with the liquid content of 15 wt% under 800 MPa are the highest. In the following study, the CSP samples were prepared using the liquid content of 15 wt% and pressure of 800 MPa and then post-annealed at various temperatures between 1000 and 1100 • C in air atmosphere.…”