Abstract
AbstractThe temperature stability of tetragonal phase, as an indispensable end component of polymorphic phase boundary in high performance potassium sodium niobate based ceramics, has been long‐term neglected. Aimed at resolving the most cutting‐edge challenges for the practical application of potassium sodium niobate (KNN)‐based ceramics, the association study between tetragonal phase and its temperature stability is focused upon, especially from a microscopic point of view. Here, four kinds of potassium sodium niobate based ceramics with orthorhombic, tetragonal, orthorhombic–tetragonal, and rhombohedral–orthorhombic–tetragonal phase boundaries are designed, and investigations from macro properties as well as the underlying domain behaviors are conducted to establish the relationship between phase structure and temperature stability. Polarization retention with aging time and domain dynamics under thermal excitation suggest that tetragonal phase is closely related to the temperature sensitivity because of their instable and fast back‐switching properties of the reoriented domains. It is believed that a new perspective in the future designing of temperature‐insensitive ceramics is put up.
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