论文标题
铁电 - 抗抗抗抗逆性多膜的相共存和形态边界的合并理论和实验研究
A Combined Theoretical and Experimental Study of the Phase Coexistence and Morphotropic Boundaries in Ferroelectric-Antiferroelectric-Antiferrodistortive Multiferroics
论文作者
论文摘要
铁电（Fe），铁晶（FEI）和抗逆抗抗逆性（AFE）阶段的物理性质，它们的共存和空间分布是形态相位过渡的抗毒性（AFD）多肌动物的功能。我们使用Landau-Ginzburg-Devonshire（LGD）现象学和半微观四个Sublattice模型（FSM），我们探讨了不同AFE，FEI和FE远程订单的行为及其在Fe-AFFE-AFE-AFD多机构中的形态相界的行为。将这些理论预测与致密Bi1-Yryfeo3陶瓷的实验观测值进行了比较，其中R为SM或LA原子，分数为0 <Y <0.25，如X射线衍射（XRD）和压电增强力显微镜（PFM）所证实。这些互补测量用于研究晶体结构的宏观和纳米镜转化。测量和计算的AFE/FE相位分数的比较表明，LGD-FSM方法很好地描述了XRD和PFM对BI1-YRYFEO3获得的实验结果。因此，这种合并的理论和实验方法提供了对模型稀有掺杂多表情的形态边界以及并存的Fe和AFE状态的起源的进一步见解。
The physical nature of the ferroelectric (FE), ferrielectric (FEI) and antiferroelectric (AFE) phases, their coexistence and spatial distributions underpin the functionality of antiferrodistortive (AFD) multiferroics in the vicinity of morphotropic phase transitions. Using Landau-Ginzburg-Devonshire (LGD) phenomenology and a semi-microscopic four sublattice model (FSM), we explore the behavior of different AFE, FEI and FE long-range orderings and their coexistence at the morphotropic phase boundaries in FE-AFE-AFD multiferroics. These theoretical predictions are compared with the experimental observations for dense Bi1-yRyFeO3 ceramics, where R is Sm or La atoms with the fraction 0 < y< 0.25, as confirmed by the X-ray diffraction (XRD) and Piezoresponse Force Microscopy (PFM). These complementary measurements were used to study the macroscopic and nanoscopic transformation of the crystal structure with the doping. The comparison of the measured and calculated AFE/FE phase fractions demonstrate that the LGD-FSM approach well describes the experimental results obtained by XRD and PFM for Bi1-yRyFeO3. Hence, this combined theoretical and experimental approach provides further insight into the origin of the morphotropic boundaries and coexisting FE and AFE states in model rare-earth doped multiferroics.
