Abstract
AbstractWe report phase transition process during the solid‐state reaction of BaCO3‐TiO2 system under the assistance of electric field. Experiments were conducted at a constant heating rate with preset field strength and current limit. Solid‐state reaction was completed upon reactive flash sintering taking place at ~1002℃ under 200 V/cm. Hexagonal BaTiO3 phase, which rarely occurs at such temperatures, was obtained after flash sintering at a current density of 23.5 mA/mm2. It is speculated that oxygen deficiency during flash sintering triggered cubic‐to‐hexagonal transition of BaTiO3. Furthermore, X‐ray diffraction results show that solid‐state reaction takes place prior to flash sintering. Electric field could accelerate the reaction but did not alter the sequence of phase evolution.
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