Effectively improved piezoelectricity in high-temperature Arrhenius CBT ceramics by modifying potential energy profile and spontaneous polarization
Source abstract
Abstract
Enhancing the piezoelectricity of CaBi₄Ti₄O₁₅ (CBT) ceramics is crucial for improving their application potential in high-temperature piezoelectric devices. Here, we propose a strategy involving the introduction of larger Na/Bi ions at the A-site, effectively inhibiting the tilt of oxygen octahedra and flattening the potential energy profile. This flattening enhances the variation of polarization under external fields. Concurrently, substituting Nb/Mn at the B-site increases the deviation between positive and negative ionic centers, leading to the stronger spontaneous polarization, while the induced defect dipoles restrict the oxygen vacancy migration and increase the ρdc. The flattened potential energy profile and increased spontaneous polarization significantly enhance the overall performance of CBT ceramics, with d33 reaching 25 pC/N while TC = 752 °C. PFM and TEM reveal submicron long rectangular domains and nano-scale domains in the modified composition, indicating a high density of domain walls. This study presents an effective approach for enhancing piezoelectricity in bismuth layered structured ferroelectrics (BLSFs), thereby improving the application potential of BLSFs at high temperatures.
Source: openalex_inverted_index · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Acoustic Wave Resonator Technologies · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (51)
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