High-Quality Lead-Free Ferroelectric Ceramics Prepared from the Flash-Creation-Method-Derived Nanopowder

Abstract

We report high-quality and high-density Bi_3.25La_0.75Ti₃O₁₂ ceramics prepared by sintering at a low temperature of 900°C from the nanosized powder with a diameter around 100 nm synthesized by the flash creation method. The densification at 900°C, which was 300°C lower sintering temperature compared with conventional solid-state reaction, enables us to obtain the ceramics showing a remanent polarization of 14.5 μC/cm², a coercive field of 50 kV/cm and a leakage current of ~10^-9 A/cm². The superior properties are indicated to originate from lower defect concentration achieved by the low temperature sintering.