Work

Dual‐Component Multilayer Piezoelectric Ceramics with a Central Through‐Hole Interdigitated Architecture for Structural‐Functional Coupling and High‐Performance Accelerometers

Year: 2026

Type: article

Abstract: ABSTRACT Piezoelectric accelerometers are key devices for vibration sensing and structural health monitoring, yet multilayer piezoelectric ceramics (MLPC) has been limited by structural incompatibility. Herein, we innovatively propose a lead‐free potassium sodium niobate (KNN)‐based multilayer piezoelectric ceramic with a through‐hole structure (MLPC‐TH), specifically designed to achieve seamless compatibility with compression‐type accelerometer architectures. The MLPC‐TH element is fabricated via a modified tape‐casting and lamination process, which integrates a tailored internal electrode configuration and postlamination laser drilling. This design not only enhances the performance of the multilayer structure but also resolves the long‐standing mechanical‐electrical coupling mismatch issue. Moreover, a dual‐component composite design leverages the performance complementarity of distinct KNN‐based phases, synergistically realizing the dual enhancement of the effective piezoelectric coefficient ( d 33 ∼ 1914 pC/N) and thermal stability. The accelerometer developed based on MLPC‐TH achieves a high charge sensitivity ( S q ∼ 55 pC/g) with nonlinearity controlled below 1%. Reliability evaluations reveal that the sensor exhibits nearly undiminished sensitivity after over 2 × 10 6 vibration cycles, and maintains stable performance across a wide temperature range of 30–100°C—demonstrating exceptional long‐term operational stability and environmental adaptability. This work establishes a scalable, high‐reliability, and environmentally sustainable strategy for next‐generation vibration sensors.

Source: Advanced Functional Materials

DOI: 10.1002/adfm.74508