Unleashing pyroelectricity enhancement via phase transition-driven defect alignment in KNN-based ferroelectrics.

ABSTRACT: The pyroelectric effect plays a critical role in thermal imaging and energy harvesting. Despite extensive efforts to enhance performance through doping and composite engineering, the mechanisms underlying defect dipole coupling with phase structures remain poorly understood, impeding the advancement of defect-engineered symmetry modulation. Here, we report an abnormal pyroelectric phenomenon where the pyroelectric coefficient (p) increases notably when poling temperature exceeds the orthorhombic-to-tetragonal phase transition temperature (T_O-T) in potassium sodium niobate ceramics. The p at 200°C (p = 45.4 × 10^-4 C m^-2 K^-1) rises more than sevenfold compared to poling within the orthorhombic phase (p = 6.5 × 10<

SUBMITTER: Huang Y 

PROVIDER: S-EPMC12412660 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature