ABSTRACT The structural, ferroelectric, piezoelectric and dielectric properties of lead-free 0.45Ba0.92Ca0.08TiO3-0.55BaTi0.96Zr0.04O3 (BCT8-BZT4) ceramics synthesized by conventional solid state reaction method have been reported. Structural analyses by X-ray diffraction (XRD) and Raman spectroscopic measurements indicate that the BCT8-BZT4 ceramics possesses both tetragonal (space group P4mm) and orthorhombic (space group Amm2) crystal structures at room temperature. Dense microstructure with 5-7 µm grain size has been observed from scanning electron micrographs. Ferroelectric nature of BCT8-BZT4 has been confirmed from the polarization-electric field (P-E) hysteresis loop measurements. For BCT8-BZT4, the values of maximum polarization (Pmax=17.24 µC/cm2), remnant polarization (Pr=6.36 µC/cm2), coercive electric field (Ec=3.66 kV/cm) and direct piezoelectric coefficient (d33∼220 pC/N) have been observed to be comparable with those of lead based piezoelectric ceramics. The BCT8-BZT4 ceramics shows usual dielectric dispersion with dielectric constant ∼1210 above 100 kHz frequency at room temperature. The observed properties show that the BCT8-BZT4 ceramics is suitable for ferroelectric memory, piezoelectric sensor, capacitor, etc applications. Thus, it has been predicted that BCT8-BZT4 may be a potential candidate for replacing lead-based piezoelectric ceramics. GRAPHICAL ABSTRACT

中文翻译：

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Ba0.92Ca0.08TiO3-BaTi0.96Zr0.04O3无铅电瓷的结构、铁电、压电和介电性能研究

摘要 已经报道了通过常规固相反应方法合成的无铅 0.45Ba0.92Ca0.08TiO3-0.55BaTi0.96Zr0.04O3 (BCT8-BZT4) 陶瓷的结构、铁电、压电和介电性能。X 射线衍射 (XRD) 和拉曼光谱测量的结构分析表明，BCT8-BZT4 陶瓷在室温下具有四方（空间群 P4mm）和正交（空间群 Amm2）晶体结构。从扫描电子显微照片中可以观察到晶粒尺寸为 5-7 µm 的致密微观结构。BCT8-BZT4 的铁电性质已从极化电场 (PE) 磁滞回线测量中得到证实。对于 BCT8-BZT4，最大极化值 (Pmax=17.24 µC/cm2)、剩余极化值 (Pr=6.36 µC/cm2)、矫顽电场 (Ec=3. 66 kV/cm) 和直接压电系数 (d33∼220 pC/N) 已被观察到与铅基压电陶瓷相当。BCT8-BZT4 陶瓷在室温下在 100 kHz 频率以上显示出通常的介电色散，介电常数约为 1210。观察到的特性表明 BCT8-BZT4 陶瓷适用于铁电存储器、压电传感器、电容器等应用。因此，已经预测 BCT8-BZT4 可能是替代铅基压电陶瓷的潜在候选者。图形概要 观察到的特性表明 BCT8-BZT4 陶瓷适用于铁电存储器、压电传感器、电容器等应用。因此，已经预测 BCT8-BZT4 可能是替代铅基压电陶瓷的潜在候选者。图形概要 观察到的特性表明 BCT8-BZT4 陶瓷适用于铁电存储器、压电传感器、电容器等应用。因此，已经预测 BCT8-BZT4 可能是替代铅基压电陶瓷的潜在候选者。图形概要