Abstract In this paper a comprehensive study that includes structural, magnetic, ferroelectric, dielectric and electrical characterizations of as-prepared and quenched MPB 1-x(BiFeO3)-x(PbTiO3)(BF-xPT) solid solutions prepared by wet chemical method has been presented. Qualitative and quantitively structural analysis revealed coexistence of rhombohedral/monoclinic, tetragonal and orthorhombic phases. Sensitivity to the experimental variables such as composition, synthesis conditions, sintering temperature and particle size, confirms the existence of a complex energy phase diagram where minima associated with various polymorphs lies almost at same level for MPB compositions. Magnetic characterizations reveal the presence of three anomalies, i.e., originating from the Neel transition, iso-structural transition and ferroelectric phase transition. Second anomaly detected to be the most sensitive to the quenching. Enhancement of magnetic moment in quenched compositions is a manifestation of strong interaction between spins of Fe2+ ions with the pinned point defect dipoles. Interestingly, thermal quenching enhanced the ferroelectric properties by removing the domain wall pinning. Saturated ferroelectric loops were observed only for quenched samples which is a consequence of strong domain wall de-pinning. Low temperature dielectric relaxation has been observed while the high temperature dielectric data of as-prepared composition exhibited Maxwell-Wagner and iso-structural phase transition. In contrast, along with these two features, quenched samples showed additional Curie transition. Enhancement in large polaron hoping in the low frequency region for the quenched composition has been confirmed via frequency dependent profile of the ac conductivity. Low value of activation energy of charge carriers for quenched compositions indicates large polaron hoping characteristics in BF-xPT solid solution.

中文翻译：

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多铁性变相相界烧结BiFeO3-xPbTiO3纳米陶瓷物性特性的鉴别与比较

摘要 本文对湿化学法制备的 MPB 1-x(BiFeO3)-x(PbTiO3)(BF-xPT) 固溶体进行了结构、磁性、铁电、介电和电学表征的综合研究。被提出。定性和定量结构分析揭示了菱形/单斜、四方和正交相的共存。对组成、合成条件、烧结温度和粒度等实验变量的敏感性证实了复杂能量相图的存在，其中与 MPB 组合物的各种多晶型物相关的最小值几乎处于同一水平。磁性特征揭示了三种异常的存在，即源自尼尔转变、同构转变和铁电相转变。检测到的第二个异常对淬灭最敏感。淬火组合物中磁矩的增强是 Fe2+ 离子自旋与钉扎点缺陷偶极子之间强相互作用的表现。有趣的是，热淬火通过去除畴壁钉扎增强了铁电性能。饱和铁电回路仅在淬火样品中观察到，这是强畴壁脱钉的结果。已观察到低温介电弛豫，而所制备组合物的高温介电数据表现出 Maxwell-Wagner 和同构相变。相比之下，除了这两个特征外，淬火样品还显示出额外的居里转变。已经通过交流电导率的频率相关曲线证实了淬灭组合物在低频区域中大极化子希望的增强。淬火组合物的载流子活化能值低表明 BF-xPT 固溶体中的极化子希望特性大。