Plate-like Multiprincipal Cation Ceramic Powders with Aurivillius and Perovskite Structures Fabricated by Molten Salt Synthesis

In the development of multiprincipal cation ceramics with perovskite structures, achieving plate-like particles with anisotropic morphology is challenging due to the crystallographic symmetry of the perovskite structure. To overcome this challenge, we developed a molten salt-based synthesis approach that enables the controlled growth of plate-like multiprincipal cation ceramic powders via topochemical microcrystal conversion. This method achieves the formation of Aurivillius and perovskite phases with aspect ratios of 27.49 and 12.74. The powders exhibit a uniform distribution of elements at identical lattice sites, confirming the formation of a multiprincipal cation system. Elemental diversification influences bonding and induces lattice distortion, resulting in defects such as oxygen vacancies and dislocations. These findings suggest that the plate-like multiprincipal cation ceramic powders synthesized in this study hold significant potential for advancing the application of perovskite ceramics in diverse fields.