R $_{0.8}$ Ce $_{0.2}$ Mn $_2$ O $_5$（R = Er，Tb）固溶体中交换-排斥铁电有序的阻挫和相分离畴电极化的强度极化生长
Frustration of Exchange-Striction Ferroelectric Ordering and Growth of Electric Polarization of Phase Separation Domains in R$_{0.8}$Ce$_{0.2}$Mn$_2$O$_5$ (R = Er, Tb) Solid Solutions
摘要：
研究了稀土离子（R = ErPDMATHABMM，$_3^+$，$_{3.75}^+$）对R $_{0.8}$ Ce $_{0.2}$ Mn $_2$ O $_5$（R = Er，Tb）多铁性材料固溶体介电性能和局部极性相分离畴引起的电极电极化的强度的影响。发现这些参数与以前研究的初始RMn $_2$ O $_5$（R = Er，Tb）晶体的参数有质的不同。它示出的极性相分离域的属性，形成在子系统中的Mn 3+和Mn 4+离子由于这些离子之间的隧道电子具有不同的价态的有限概率是基本上依赖于这些域存在的晶体场的值。发现Er $_3^+$、Tb $_3^+$和Ce $_{3.75}^+$离子的组合影响与RMn $_2$ O $_5$（R = Er，Tb）相比，基本上改变了R $_{0.8}$ Ce $_{0.2}$ Mn $_2$ O $_5$（R = Er，Tb）中的晶场。
英文摘要：
The effect of rare-earth ions (R = Er$_3^+$, Tb$_3^+$, and Ce$_{3.75}^+$) on the dielectric properties and the electric polarization induced by local polar phase separation domains in solid solutions of R$_{0.8}$Ce$_{0.2}$Mn$_2$O$_5$ (R = Er, Tb) multiferroics has been studied. These parameters are found to qualitatively differ from those of initial RMn$_2$O$_5$ (R = Er, Tb) crystals studied before. It is shown that the properties of the polar phase separation domains that form in a subsystem of Mn3+ and Mn4+ ions due to a finite probability of tunneling electrons between these ions with different valences are substantially dependent on the values of crystal fields in which these domains exist. A combined influence of Er$_3^+$, Tb$_3^+$, and Ce$_{3.75}^+$ ions is found to substantially change the crystal field in R$_{0.8}$Ce$_{0.2}$ Mn$_2$O$_5$ (R = Er, Tb) as compared to RMn$_2$O$_5$ (R = Er, Tb).
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