La based Co-Fe combined double perovskite (La1.8Pr0.2CoFeO6) was synthesized and the dielectric (zero-field and in-field), magnetic, X-ray absorption and Raman spectroscopy measurements have been investigated for La1.8Pr0.2CoFeO6 double perovskite. The existence of re-entrant cluster glass state is observed. The magneto-dielectric (MD) is found in two temperature regions (25-80 K and 125-275 K). It has been demonstrated that the observed MD at low and high temperatures are respectively due to the spin freezing and the spin-lattice coupling. Furthermore, the very large dielectric constant and the low loss suggest that La1.8Pr0.2CoFeO6 is very important from the application point of view.

中文翻译：

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重入团簇玻璃态和自旋晶格耦合在巨型介电双钙钛矿La1.8Pr0.2CoFeO6磁介电行为中的作用


合成了La基Co-Fe复合双钙钛矿（La1.8Pr0.2CoFeO6），并研究了La1.8Pr0.2CoFeO6双钙钛矿的介电（零场和场内）、磁性、X射线吸收和拉曼光谱测量钙钛矿。观察到重入簇玻璃态的存在。磁电介质 (MD) 存在于两个温度区域（25-80 K 和 125-275 K）。已经证明，在低温和高温下观察到的MD分别是由于自旋冻结和自旋晶格耦合造成的。此外，非常大的介电常数和低损耗表明La1.8Pr0.2CoFeO6从应用角度来看非常重要。