Abstract
Conventional sintering of lanthanum-chromite-based ceramics typically requires a long isothermal duration, which leads to severe loss of volatile components. In this study, we prepared dense LaCrO3 (LCO), La0.8Ca0.2CrO3 (LCCO), and La0.8(Mg0.05Ca0.05Sr0.05Ba0.05)CrO3 (4LCO) ceramics with stable single-phase structures through ultrafast high-temperature sintering (UHS), and the total sintering period was shorter than 8 min. An investigation of the effects of sintering parameters and alkaline earth (AE) metal dopants on the density showed that doping with AE metal promoted the densification of LaCrO3 through the liquid-phase-assisted sintering mechanism. The hardness and conductivity of the ceramics were in the order of LCCO>4LCO>LCO because of the effect of lattice distortion and the relative densities of the pellets. This work presents a compositional-design-based method to obtain high-performance perovskite-type oxides, and it is expected to broaden the use of UHS for the densification of novel ceramics.
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