Abstract

The effect of rare-earth ions (R = Er³⁺, Tb³⁺, and Ce^3.75+) on the dielectric properties and the electric polarization induced by local polar phase separation domains in solid solutions of R_0.8Ce_0.2Mn₂O₅ (R = Er, Tb) multiferroics has been studied. These parameters are found to qualitatively differ from those of initial RMn₂O₅ (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 Er³⁺, Tb³⁺, and Ce^3.75+ ions is found to substantially change the crystal field in R_0.8Ce_0.2Mn₂O₅ (R = Er, Tb) as compared to RMn₂O₅ (R = Er, Tb).

中文翻译：

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R 0.8 Ce 0.2 Mn 2 O 5（R = Er，Tb）固溶体中交换摩擦铁电有序的挫败和相分离域的电极化的增长

摘要

R _0.8 Ce _0.2 Mn ₂ O ₅固溶体中稀土离子（R = Er ³⁺，Tb ³⁺和Ce ^3.75+）对局部极性相分离域引起的介电性能和电极化的影响（R = Er，Tb）多铁性已被研究。发现这些参数与先前研究的初始RMn ₂ O ₅（R = Er，Tb）晶体在质量上有差异。结果表明，在Mn ³⁺和Mn ⁴⁺的子系统中形成的极性相分离域的性质由于具有不同化合价的电子在这些离子之间隧穿的概率有限，所以这些离子基本上取决于存在这些畴的晶体场的值。与RMn ₂ O ₅（R ）相比，发现Er ³⁺，Tb ³⁺和Ce ^3.75+离子的综合影响实质上改变了R _0.8 Ce _0.2 Mn ₂ O ₅（R = Er，Tb）的晶体场。= Er，Tb）。