Abstract
AbstractHigh‐performance piezoelectric ceramic materials are required for piezoelectric sensors under harsh conditions in nuclear power plants, aeronautics, and aerospace. In this work, a lead‐free high‐Curie‐temperature (TC ∼792°C) Aurivillius‐type sodium bismuth niobate, Na0.5Bi2.5Nb2O9 (NBN), was fabricated through spark plasma sintering (SPS). The textured NBN ceramics with a high orientation factor of 83% exhibit significantly enhanced piezoelectric performance with a piezoelectric constant d33 of 31.2 pC/N, three times higher than that of nontextured NBN (d33 ∼ 11.6 pC/N). More importantly, the textured NBN ceramics maintain excellent electrical properties at high temperature, with a high in situ d33 of 35.9 pC/N, very low dielectric loss tanδ = 2.5% (@ 100 kHz) and high dc electrical resistivity ρ of 7.5 MΩ cm at 500°C. These results suggest that the textured NBN ceramics are good high‐temperature piezoelectric ceramic materials, and have promising applications in the field of high‐temperature piezoelectric sensors.
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