Influence of Sr(Sn0.5Zr0.5)O3 Modification on Phase Structure and Electrical Response of BNT–7BT Ceramics near the Morphotropic Phase Boundary
Main Article Content
Abstract
(Bi0.5Na0.5)TiO3–0.07BaTiO3–xSr(Sn0.5Zr0.5)O3 (abbreviated as BNT–7BT–xSSZ) ceramics were fabricated via a conventional solid-state reaction method with x = 0–0.05, where 1 wt.% Li2CO3 was introduced to reduce the sintering temperature to ~1050 oC. All samples exhibit a perovskite structure with the coexistence of R3c and P4bm phases, indicating typical ergodic relaxor behavior. Among all compositions, x = 0.01 shows the optimal performance, with the highest strain (Smax ≈ 0.23% at 60 kV/cm), corresponding to a high dynamic piezoelectric coefficient (d33* ≈ 385 pm/V), attributed to a balanced phase fraction near the morphotropic phase boundary. With increasing dopant content, the stabilization of the relaxor state suppresses domain switching, leading to reduced electromechanical response. An energy storage efficiency of ~62% is also achieved, suggesting potential for dielectric energy storage. These results demonstrate that Sr(Sn0.5Zr0.5)O3 doping is an effective strategy to tune the structure–property relationship in BNT-based ceramics for electromechanical applications.
Keywords
Lead-free, piezoelectric, ceramic, BNBT, SSZ
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References
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