Effect of Ba on ferroelectric and piezoelectric properties of the PLZT (1.2/55/45) system
Effect of Ba on ferroelectric and piezoelectric properties of the PLZT (1.2/55/45) system
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DOI：
10.1002/pssa.200521322
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
Ramam Koduri;Luis Salinas Hermosilla
中科院分区：
文献类型：
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作者：
Ramam Koduri;Luis Salinas Hermosilla
通过混合氧化物方法制备了铁电 Pb0.982–zLa0.012Δ0.006Baz(Zr0.55Ti0.45)O3 (PLZT; z = 0–6 mol%) 陶瓷组合物。烧结陶瓷的 X 射线衍射研究表明，5 mol% Ba 掺杂的 PLZT 组合物中菱形相和四方相共存。扫描电子显微照片证明，随着 PLZT 系统中 Ba 浓度的增加，晶粒生长受到抑制。介电常数和介电损耗作为温度的函数表明，当组合物含有 4 mol% 和 5 mol% Ba 时，εrt 和 tan δ 分别增加。介电最大值 (εTc) 降低至 4 mol% Ba，并逐渐增加至 6 mol% Ba，而随着 PLZT 系统中 Ba 浓度的增加，居里温度 (TC) 从不含 Ba 的组合物降低到含有 6 mol% Ba 的组合物。对组合物系列研究了作为温度和频率函数的弛豫行为。随着Ba浓度的增加，矫顽场（Ec）逐渐增强。 Ba 成分含量为 5 mol% 时，剩余极化 (Pr) 和自发极化 (Ps) 下降。 Ba 成分含量为 4 mol% 时，压电电荷系数 (d33)、压电平面耦合系数 (kp) 和压电厚度耦合系数 (kt) 增加，这些成分是传感器和执行器应用的潜在成分。 （© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
Ferroelectric Pb0.982–zLa0.012Δ0.006Baz(Zr0.55Ti0.45)O3 (PLZT; z = 0–6 mol%) ceramic compositions were fabricated by a mixed‐oxide method. X‐ray diffraction studies of sintered ceramics indicate the coexistence of rhombohedral and tetragonal phases in the 5 mol% Ba‐doped PLZT composition. Grain growth is inhibited with increasing Ba concentration in the PLZT system as evidenced by scanning electron micrographs. Dielectric constant and dielectric loss as a function of temperature suggest that ϵrt and tan δ are increased up to compositions containing 4 and 5 mol% Ba, respectively. The dielectric maximum (ϵTc) decreased to 4 mol% Ba and gradually increased to 6 mol% Ba, whereas, with increasing Ba concentration in the PLZT system, the Curie temperature (TC) decreased from the composition with no Ba to that with 6 mol% Ba. Relaxor behavior as a function of temperature and frequency was studied over the composition series. As the Ba concentration increased, the coercive field (Ec) showed a gradual enhancement. Remanent (Pr) and spontaneous (Ps) polarizations decreased to the 5 mol% Ba composition. Piezoelectric charge coefficient (d33), piezoelectric planar coupling coefficient (kp) and piezoelectric thickness coupling coefficient (kt) increased to the 4 mol% Ba composition, which are potential compositions for sensor and actuator applications. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)