论文标题
直接观察放松器铁电PB中的单斜极纳米台化（yb $ _ {1/2} $ nb $ _ {1/2} $）
Direct observation of monoclinic polar nanoregions in the relaxor ferroelectric Pb(Yb$_{1/2}$Nb$_{1/2}$)O$_{3}$-PbTiO$_{3}$
论文作者
论文摘要
放松器铁电体应用于执行器和声纳等电子设备。具有单斜结构的形态营养相边界（MPB）以其高的压电性和机电耦合因子而闻名。PBTIO$ _ {3} $的实心溶液中的压电和机电耦合因子和放松剂铁链和放松器铁链（pb（pb $ _ {mg $ _ {1/3} $，nb $，nb $，nb $ _} $ _ $ _} pb（zn $ _ {1/3} $，nb $ _ {1/3} $）o $ _ {3} $）。然而，尚未报道与具有介电分散体松弛度特性的极性纳米化结构域（极性纳米区域）有关的单斜结构。 Using transmission electron microscopy and synchrotron x-ray scattering, we present the first observations of coexisting monoclinic structures and polar nanoregions near the MPB in Pb(Yb$_{1/2}$Nb$_{1/2}$)O$_{3}$-PbTiO$_{3}$.该材料中的极性纳米层是随机形状的，与规范松弛剂PB（mg $ _ {1/3} $，nb $ _ {1/3} $）的铁电纳米域不同，此外，原位观察结果表明，随着温度的降低，单斜极纳米区域会增长。成对分布函数分析揭示了极性纳米层中单斜pm和CM结构的混合物，而没有其他基于PB的弛豫固体溶液的菱形结构。由于放松特性（极性纳米层）和高压电性（单斜结构）共存的特殊性质，因此，这种材料被预期是理解松弛剂铁电性的新平台。
Relaxor ferroelectrics are applied in electronic devices such as actuators and sonars. Morphotrophic phase boundaries (MPBs) with monoclinic structures are known for their high piezoelectricity and electromechanical coupling factors in solid solutions of PbTiO$_{3}$ and relaxor ferroelectrics (Pb(Mg$_{1/3}$, Nb$_{2/3}$)O$_{3}$ or Pb(Zn$_{1/3}$, Nb$_{1/3}$)O$_{3}$). However, the monoclinic structures related to polar nanosize domains (polar nanoregions) exhibiting the relaxor properties of dielectric dispersion have not been reported. Using transmission electron microscopy and synchrotron x-ray scattering, we present the first observations of coexisting monoclinic structures and polar nanoregions near the MPB in Pb(Yb$_{1/2}$Nb$_{1/2}$)O$_{3}$-PbTiO$_{3}$. The polar nanoregions in this material are randomly shaped, unlike the ferroelectric nanodomains of the canonical relaxor Pb(Mg$_{1/3}$, Nb$_{1/3}$)O$_{3}$-PbTiO$_{1/3}$. Furthermore, in situ observations reveal that the monoclinic polar nanoregions grow as the temperature decreases. A pair-distribution function analysis reveals a mixture of monoclinic Pm and Cm structures in the polar nanoregions without the rhombohedral structure of other Pb-based relaxor solid solutions. Owing to the peculiar nature of the coexistence of the relaxor property (polar nanoregions) and high piezoelectricity (monoclinic structure), this material is expected as a new platform for understanding relaxor ferroelectricity.
